diff --git a/pkgs/applications/networking/google-drive-ocamlfuse/default.nix b/pkgs/applications/networking/google-drive-ocamlfuse/default.nix
index 87ef5f2a41a2..ff099a909c75 100644
--- a/pkgs/applications/networking/google-drive-ocamlfuse/default.nix
+++ b/pkgs/applications/networking/google-drive-ocamlfuse/default.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchFromGitHub, zlib
-, ocaml, jbuilder, opam, ocamlfuse, findlib, gapi_ocaml, ocaml_sqlite3, camlidl }:
+, ocaml, dune, ocamlfuse, findlib, gapi_ocaml, ocaml_sqlite3, camlidl }:
 
 stdenv.mkDerivation rec {
   name = "google-drive-ocamlfuse-${version}";
@@ -12,12 +12,12 @@ stdenv.mkDerivation rec {
     sha256 = "1rjm2jcc93sz7l25zbgqal81534vvvbmwy7847s0k8fkr5nq97gp";
   };
 
-  nativeBuildInputs = [ jbuilder opam ];
+  nativeBuildInputs = [ dune ];
 
   buildInputs = [ zlib ocaml ocamlfuse findlib gapi_ocaml ocaml_sqlite3 camlidl ];
 
   buildPhase = "jbuilder build @install";
-  installPhase = "mkdir $out && jbuilder install --prefix $out";
+  installPhase = "mkdir $out && dune install --prefix $out";
 
   meta = {
     homepage = http://gdfuse.forge.ocamlcore.org/;
diff --git a/pkgs/development/compilers/reason/default.nix b/pkgs/development/compilers/reason/default.nix
index f4cc1cf2b650..81c935fc421f 100644
--- a/pkgs/development/compilers/reason/default.nix
+++ b/pkgs/development/compilers/reason/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, makeWrapper, fetchFromGitHub, ocaml, findlib, jbuilder
+{ stdenv, makeWrapper, fetchFromGitHub, ocaml, findlib, dune
 , menhir, merlin_extend, ppx_tools_versioned, utop
 }:
 
@@ -15,14 +15,14 @@ stdenv.mkDerivation rec {
 
   propagatedBuildInputs = [ menhir merlin_extend ppx_tools_versioned ];
 
-  buildInputs = [ makeWrapper ocaml findlib jbuilder utop menhir ];
+  buildInputs = [ makeWrapper ocaml findlib dune utop menhir ];
 
   buildFlags = [ "build" ]; # do not "make tests" before reason lib is installed
 
   installPhase = ''
     for p in reason rtop
     do
-      ${jbuilder.installPhase} $p.install
+      ${dune.installPhase} $p.install
     done
 
     wrapProgram $out/bin/rtop \
diff --git a/pkgs/development/ocaml-modules/alcotest/default.nix b/pkgs/development/ocaml-modules/alcotest/default.nix
index 000ff8285c53..8723b6a1f1ff 100644
--- a/pkgs/development/ocaml-modules/alcotest/default.nix
+++ b/pkgs/development/ocaml-modules/alcotest/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchzip, ocaml, findlib, ocamlbuild, topkg, jbuilder
+{ stdenv, fetchzip, ocaml, findlib, ocamlbuild, topkg, dune
 , cmdliner, astring, fmt, result
 }:
 
@@ -6,9 +6,9 @@ let param =
   if stdenv.lib.versionAtLeast ocaml.version "4.02" then {
     version = "0.8.2";
     sha256 = "1zpg079v89mz2dpnh59f9hk5r03wl26skfn43llrv3kg24abjfpf";
-    buildInputs = [ jbuilder ];
-    buildPhase = "jbuilder build -p alcotest";
-    inherit (jbuilder) installPhase;
+    buildInputs = [ dune ];
+    buildPhase = "dune build -p alcotest";
+    inherit (dune) installPhase;
   } else {
     version = "0.7.2";
     sha256 = "1qgsz2zz5ky6s5pf3j3shc4fjc36rqnjflk8x0wl1fcpvvkr52md";
diff --git a/pkgs/development/ocaml-modules/angstrom/default.nix b/pkgs/development/ocaml-modules/angstrom/default.nix
index 97baca62e724..0c00dc2ff24e 100644
--- a/pkgs/development/ocaml-modules/angstrom/default.nix
+++ b/pkgs/development/ocaml-modules/angstrom/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, ocaml, findlib, jbuilder, alcotest, result
+{ stdenv, fetchFromGitHub, ocaml, findlib, dune, alcotest, result
 , bigstringaf
 }:
 
@@ -17,15 +17,15 @@ stdenv.mkDerivation rec {
     sha256 = "0lh6024yf9ds0nh9i93r9m6p5psi8nvrqxl5x7jwl13zb0r9xfpw";
   };
 
-  buildInputs = [ ocaml findlib jbuilder alcotest ];
+  buildInputs = [ ocaml findlib dune alcotest ];
   propagatedBuildInputs = [ bigstringaf result ];
 
-  buildPhase = "jbuilder build -p angstrom";
+  buildPhase = "dune build -p angstrom";
 
   doCheck = true;
-  checkPhase = "jbuilder runtest -p angstrom";
+  checkPhase = "dune runtest -p angstrom";
 
-  inherit (jbuilder) installPhase;
+  inherit (dune) installPhase;
 
   meta = {
     homepage = https://github.com/inhabitedtype/angstrom;
diff --git a/pkgs/development/ocaml-modules/atd/default.nix b/pkgs/development/ocaml-modules/atd/default.nix
index 52a1fc36921c..d5cd38bba728 100644
--- a/pkgs/development/ocaml-modules/atd/default.nix
+++ b/pkgs/development/ocaml-modules/atd/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, menhir, easy-format, ocaml, findlib, fetchFromGitHub, jbuilder, which, biniou, yojson }:
+{ stdenv, menhir, easy-format, ocaml, findlib, fetchFromGitHub, dune, which, biniou, yojson }:
 
 stdenv.mkDerivation rec {
   version = "2.0.0";
@@ -14,11 +14,11 @@ stdenv.mkDerivation rec {
 
   createFindlibDestdir = true;
 
-  buildInputs = [ which jbuilder ocaml findlib menhir ];
+  buildInputs = [ which dune ocaml findlib menhir ];
   propagatedBuildInputs = [ easy-format biniou yojson ];
 
   buildPhase = "jbuilder build";
-  inherit (jbuilder) installPhase;
+  inherit (dune) installPhase;
 
   meta = with stdenv.lib; {
     homepage = https://github.com/mjambon/atd;
diff --git a/pkgs/development/ocaml-modules/bigstringaf/default.nix b/pkgs/development/ocaml-modules/bigstringaf/default.nix
index 21a0e3943923..fc9a5379b178 100644
--- a/pkgs/development/ocaml-modules/bigstringaf/default.nix
+++ b/pkgs/development/ocaml-modules/bigstringaf/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, ocaml, findlib, jbuilder, alcotest }:
+{ stdenv, fetchFromGitHub, ocaml, findlib, dune, alcotest }:
 
 if !stdenv.lib.versionAtLeast ocaml.version "4.03"
 then throw "bigstringaf is not available for OCaml ${ocaml.version}"
@@ -15,12 +15,12 @@ stdenv.mkDerivation rec {
     sha256 = "1yx6hv8rk0ldz1h6kk00rwg8abpfc376z00aifl9f5rn7xavpscs";
   };
 
-  buildInputs = [ ocaml findlib jbuilder alcotest ];
+  buildInputs = [ ocaml findlib dune alcotest ];
 
   doCheck = true;
   checkPhase = "dune runtest";
 
-  inherit (jbuilder) installPhase;
+  inherit (dune) installPhase;
 
   meta = {
     description = "Bigstring intrinsics and fast blits based on memcpy/memmove";
diff --git a/pkgs/development/ocaml-modules/biniou/default.nix b/pkgs/development/ocaml-modules/biniou/default.nix
index 97c4750002e6..439fce3bfd5b 100644
--- a/pkgs/development/ocaml-modules/biniou/default.nix
+++ b/pkgs/development/ocaml-modules/biniou/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, ocaml, findlib, jbuilder, easy-format }:
+{ stdenv, fetchFromGitHub, ocaml, findlib, dune, easy-format }:
 
 stdenv.mkDerivation rec {
   version = "1.2.0";
@@ -10,7 +10,7 @@ stdenv.mkDerivation rec {
     sha256 = "0mjpgwyfq2b2izjw0flmlpvdjgqpq8shs89hxj1np2r50csr8dcb";
   };
 
-  buildInputs = [ ocaml findlib jbuilder ];
+  buildInputs = [ ocaml findlib dune ];
 
   propagatedBuildInputs = [ easy-format ];
 
@@ -18,7 +18,7 @@ stdenv.mkDerivation rec {
    patchShebangs .
   '';
 
-  inherit (jbuilder) installPhase;
+  inherit (dune) installPhase;
 
   meta = {
     inherit (src.meta) homepage;
diff --git a/pkgs/development/ocaml-modules/bitstring/default.nix b/pkgs/development/ocaml-modules/bitstring/default.nix
index 13424272bcf8..93bcb3cb1e99 100644
--- a/pkgs/development/ocaml-modules/bitstring/default.nix
+++ b/pkgs/development/ocaml-modules/bitstring/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, ocaml, findlib, jbuilder
+{ stdenv, fetchFromGitHub, ocaml, findlib, dune
 , ppx_tools_versioned
 , ounit
 }:
@@ -13,14 +13,14 @@ stdenv.mkDerivation rec {
     sha256 = "0r49qax7as48jgknzaq6p9rbpmrvnmlic713wzz5bj60j5h0396f";
   };
 
-  buildInputs = [ ocaml findlib jbuilder ppx_tools_versioned ounit ];
+  buildInputs = [ ocaml findlib dune ppx_tools_versioned ounit ];
 
   buildPhase = "jbuilder build";
 
   doCheck = true;
   checkPhase = "jbuilder runtest";
 
-  inherit (jbuilder) installPhase;
+  inherit (dune) installPhase;
 
   meta = with stdenv.lib; {
     description = "This library adds Erlang-style bitstrings and matching over bitstrings as a syntax extension and library for OCaml";
diff --git a/pkgs/development/ocaml-modules/camlimages/default.nix b/pkgs/development/ocaml-modules/camlimages/default.nix
index def710f3f1b0..b5ef173c9ff8 100644
--- a/pkgs/development/ocaml-modules/camlimages/default.nix
+++ b/pkgs/development/ocaml-modules/camlimages/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchzip, findlib, jbuilder, ocaml, configurator, cppo, lablgtk }:
+{ stdenv, fetchzip, findlib, dune, ocaml, configurator, cppo, lablgtk }:
 stdenv.mkDerivation rec {
   name = "camlimages-${version}";
   version = "5.0.0";
@@ -6,9 +6,9 @@ stdenv.mkDerivation rec {
     url = "https://bitbucket.org/camlspotter/camlimages/get/${version}.tar.gz";
     sha256 = "00qvwxkfnhv93yi1iq7vy3p5lxyi9xigxcq464s4ii6bmp32d998";
   };
-  buildInputs = [ findlib jbuilder ocaml configurator cppo lablgtk ];
-  buildPhase = "jbuilder build -p camlimages";
-  inherit (jbuilder) installPhase;
+  buildInputs = [ findlib dune ocaml configurator cppo lablgtk ];
+  buildPhase = "dune build -p camlimages";
+  inherit (dune) installPhase;
   
   meta = with stdenv.lib; {
     branch = "5.0";
diff --git a/pkgs/development/ocaml-modules/camomile/default.nix b/pkgs/development/ocaml-modules/camomile/default.nix
index fc0ecfc1502f..53c45d17854c 100644
--- a/pkgs/development/ocaml-modules/camomile/default.nix
+++ b/pkgs/development/ocaml-modules/camomile/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, ocaml, findlib, jbuilder, cppo }:
+{ stdenv, fetchFromGitHub, ocaml, findlib, dune, cppo }:
 
 stdenv.mkDerivation rec {
 	version = "0.8.7";
@@ -11,11 +11,11 @@ stdenv.mkDerivation rec {
 		sha256 = "0rh58nl5jrnx01hf0yqbdcc2ncx107pq29zblchww82ci0x1xwsf";
 	};
 
-	buildInputs = [ ocaml findlib jbuilder cppo ];
+	buildInputs = [ ocaml findlib dune cppo ];
 
 	configurePhase = "ocaml configure.ml --share $out/share/camomile";
 
-	inherit (jbuilder) installPhase;
+	inherit (dune) installPhase;
 
 	meta = {
 		inherit (ocaml.meta) platforms;
diff --git a/pkgs/development/ocaml-modules/cohttp/default.nix b/pkgs/development/ocaml-modules/cohttp/default.nix
index 962525b47e42..79dc919556ae 100644
--- a/pkgs/development/ocaml-modules/cohttp/default.nix
+++ b/pkgs/development/ocaml-modules/cohttp/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, ocaml, findlib, jbuilder
+{ stdenv, fetchFromGitHub, ocaml, findlib, dune
 , ppx_fields_conv, ppx_sexp_conv, ppx_deriving
 , base64, fieldslib, jsonm, re, stringext, uri
 }:
@@ -14,13 +14,13 @@ stdenv.mkDerivation rec {
 		sha256 = "0zgn32axmjvkmbvyfkbjcqximzc4zcfxs118b98xyrqnvwb0k7ka";
 	};
 
-	buildInputs = [ ocaml findlib jbuilder jsonm ppx_fields_conv ppx_sexp_conv ];
+	buildInputs = [ ocaml findlib dune jsonm ppx_fields_conv ppx_sexp_conv ];
 
 	propagatedBuildInputs = [ ppx_deriving base64 fieldslib re stringext uri ];
 
-	buildPhase = "jbuilder build -p cohttp";
+	buildPhase = "dune build -p cohttp";
 
-	inherit (jbuilder) installPhase;
+	inherit (dune) installPhase;
 
 	meta = {
 		description = "HTTP(S) library for Lwt, Async and Mirage";
diff --git a/pkgs/development/ocaml-modules/cohttp/lwt-unix.nix b/pkgs/development/ocaml-modules/cohttp/lwt-unix.nix
index c526a101dd9d..6489a583198c 100644
--- a/pkgs/development/ocaml-modules/cohttp/lwt-unix.nix
+++ b/pkgs/development/ocaml-modules/cohttp/lwt-unix.nix
@@ -1,4 +1,4 @@
-{ stdenv, ocaml, findlib, jbuilder, cohttp-lwt
+{ stdenv, ocaml, findlib, dune, cohttp-lwt
 , conduit-lwt-unix, ppx_sexp_conv
 , cmdliner, fmt, magic-mime
 }:
@@ -11,9 +11,9 @@ stdenv.mkDerivation rec {
 	name = "ocaml${ocaml.version}-cohttp-lwt-unix-${version}";
 	inherit (cohttp-lwt) version src installPhase meta;
 
-	buildInputs = [ ocaml findlib jbuilder cmdliner ppx_sexp_conv ];
+	buildInputs = [ ocaml findlib dune cmdliner ppx_sexp_conv ];
 
 	propagatedBuildInputs = [ cohttp-lwt conduit-lwt-unix fmt magic-mime ];
 
-	buildPhase = "jbuilder build -p cohttp-lwt-unix";
+	buildPhase = "dune build -p cohttp-lwt-unix";
 }
diff --git a/pkgs/development/ocaml-modules/cohttp/lwt.nix b/pkgs/development/ocaml-modules/cohttp/lwt.nix
index 21bea646d721..1630bfd131e4 100644
--- a/pkgs/development/ocaml-modules/cohttp/lwt.nix
+++ b/pkgs/development/ocaml-modules/cohttp/lwt.nix
@@ -1,4 +1,4 @@
-{ stdenv, ocaml, findlib, jbuilder, cohttp, lwt3, uri, ppx_sexp_conv }:
+{ stdenv, ocaml, findlib, dune, cohttp, lwt3, uri, ppx_sexp_conv }:
 
 if !stdenv.lib.versionAtLeast cohttp.version "0.99"
 then cohttp
@@ -8,9 +8,9 @@ stdenv.mkDerivation rec {
 	name = "ocaml${ocaml.version}-cohttp-lwt-${version}";
 	inherit (cohttp) version src installPhase meta;
 
-	buildInputs = [ ocaml findlib jbuilder uri ppx_sexp_conv ];
+	buildInputs = [ ocaml findlib dune uri ppx_sexp_conv ];
 
 	propagatedBuildInputs = [ cohttp lwt3 ];
 
-	buildPhase = "jbuilder build -p cohttp-lwt";
+	buildPhase = "dune build -p cohttp-lwt";
 }
diff --git a/pkgs/development/ocaml-modules/conduit/default.nix b/pkgs/development/ocaml-modules/conduit/default.nix
index 98ac997383c7..fdfd2bed1f15 100644
--- a/pkgs/development/ocaml-modules/conduit/default.nix
+++ b/pkgs/development/ocaml-modules/conduit/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, ocaml, findlib, jbuilder
+{ stdenv, fetchFromGitHub, ocaml, findlib, dune
 , ppx_sexp_conv
 , astring, ipaddr, uri
 }:
@@ -14,12 +14,12 @@ stdenv.mkDerivation rec {
 		sha256 = "1ryigzh7sfif1mly624fpm87aw5h60n5wzdlrvqsf71qcpxc6iiz";
 	};
 
-	buildInputs = [ ocaml findlib jbuilder ppx_sexp_conv ];
+	buildInputs = [ ocaml findlib dune ppx_sexp_conv ];
 	propagatedBuildInputs = [ astring ipaddr uri ];
 
-	buildPhase = "jbuilder build -p conduit";
+	buildPhase = "dune build -p conduit";
 
-	inherit (jbuilder) installPhase;
+	inherit (dune) installPhase;
 
 	meta = {
 		description = "Network connection library for TCP and SSL";
diff --git a/pkgs/development/ocaml-modules/conduit/lwt-unix.nix b/pkgs/development/ocaml-modules/conduit/lwt-unix.nix
index 5f33bbc42c10..b4357979de75 100644
--- a/pkgs/development/ocaml-modules/conduit/lwt-unix.nix
+++ b/pkgs/development/ocaml-modules/conduit/lwt-unix.nix
@@ -1,4 +1,4 @@
-{ stdenv, ocaml, findlib, jbuilder, conduit-lwt
+{ stdenv, ocaml, findlib, dune, conduit-lwt
 , logs, ppx_sexp_conv, lwt_ssl
 }:
 
@@ -10,9 +10,9 @@ stdenv.mkDerivation rec {
 	name = "ocaml${ocaml.version}-conduit-lwt-unix-${version}";
 	inherit (conduit-lwt) version src installPhase meta;
 
-	buildInputs = [ ocaml findlib jbuilder ppx_sexp_conv ];
+	buildInputs = [ ocaml findlib dune ppx_sexp_conv ];
 
 	propagatedBuildInputs = [ conduit-lwt logs lwt_ssl ];
 
-	buildPhase = "jbuilder build -p conduit-lwt-unix";
+	buildPhase = "dune build -p conduit-lwt-unix";
 }
diff --git a/pkgs/development/ocaml-modules/conduit/lwt.nix b/pkgs/development/ocaml-modules/conduit/lwt.nix
index 8ee3d827ecc1..5b085239cfd0 100644
--- a/pkgs/development/ocaml-modules/conduit/lwt.nix
+++ b/pkgs/development/ocaml-modules/conduit/lwt.nix
@@ -1,4 +1,4 @@
-{ stdenv, ocaml, findlib, jbuilder, ppx_sexp_conv, conduit, lwt3 }:
+{ stdenv, ocaml, findlib, dune, ppx_sexp_conv, conduit, lwt3 }:
 
 if !stdenv.lib.versionAtLeast conduit.version "1.0"
 then conduit
@@ -8,9 +8,9 @@ stdenv.mkDerivation rec {
 	name = "ocaml${ocaml.version}-conduit-lwt-${version}";
 	inherit (conduit) version src installPhase meta;
 
-	buildInputs = [ ocaml findlib jbuilder ppx_sexp_conv ];
+	buildInputs = [ ocaml findlib dune ppx_sexp_conv ];
 
 	propagatedBuildInputs = [ conduit lwt3 ];
 
-	buildPhase = "jbuilder build -p conduit-lwt";
+	buildPhase = "dune build -p conduit-lwt";
 }
diff --git a/pkgs/development/ocaml-modules/cstruct/default.nix b/pkgs/development/ocaml-modules/cstruct/default.nix
index 0f5380f9a41f..1a5a992f2be1 100644
--- a/pkgs/development/ocaml-modules/cstruct/default.nix
+++ b/pkgs/development/ocaml-modules/cstruct/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, ocaml, jbuilder, findlib, sexplib, ocplib-endian }:
+{ stdenv, fetchurl, ocaml, dune, findlib, sexplib, ocplib-endian }:
 
 stdenv.mkDerivation rec {
   name = "ocaml${ocaml.version}-cstruct-${version}";
@@ -10,13 +10,13 @@ stdenv.mkDerivation rec {
 
   unpackCmd = "tar -xjf $curSrc";
 
-  buildInputs = [ ocaml jbuilder findlib ];
+  buildInputs = [ ocaml dune findlib ];
 
   propagatedBuildInputs = [ sexplib ocplib-endian ];
 
-  buildPhase = "jbuilder build -p cstruct";
+  buildPhase = "dune build -p cstruct";
 
-  inherit (jbuilder) installPhase;
+  inherit (dune) installPhase;
 
   meta = {
     description = "Access C-like structures directly from OCaml";
diff --git a/pkgs/development/ocaml-modules/cstruct/ppx.nix b/pkgs/development/ocaml-modules/cstruct/ppx.nix
index 9d19e1751e23..1696e200750c 100644
--- a/pkgs/development/ocaml-modules/cstruct/ppx.nix
+++ b/pkgs/development/ocaml-modules/cstruct/ppx.nix
@@ -9,5 +9,5 @@ stdenv.mkDerivation rec {
 	buildInputs = cstruct.buildInputs ++ [ ppx_tools_versioned ];
 	propagatedBuildInputs = [ cstruct ];
 
-	buildPhase = "jbuilder build -p ppx_cstruct";
+	buildPhase = "dune build -p ppx_cstruct";
 }
diff --git a/pkgs/development/ocaml-modules/csv/default.nix b/pkgs/development/ocaml-modules/csv/default.nix
index 804cbb8ea858..6c6f8a68f814 100644
--- a/pkgs/development/ocaml-modules/csv/default.nix
+++ b/pkgs/development/ocaml-modules/csv/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, ocaml, findlib, jbuilder }:
+{ stdenv, fetchurl, ocaml, findlib, dune }:
 
 stdenv.mkDerivation rec {
 	version = "2.1";
@@ -10,11 +10,11 @@ stdenv.mkDerivation rec {
 
 	unpackCmd = "tar -xjf $src";
 
-	buildInputs = [ ocaml findlib jbuilder ];
+	buildInputs = [ ocaml findlib dune ];
 
-	buildPhase = "jbuilder build -p csv";
+	buildPhase = "dune build -p csv";
 
-	inherit (jbuilder) installPhase;
+	inherit (dune) installPhase;
 
 	meta = {
 		description = "A pure OCaml library to read and write CSV files";
diff --git a/pkgs/development/ocaml-modules/dtoa/default.nix b/pkgs/development/ocaml-modules/dtoa/default.nix
index 9b6e56266143..a76e0c61450b 100644
--- a/pkgs/development/ocaml-modules/dtoa/default.nix
+++ b/pkgs/development/ocaml-modules/dtoa/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, ocaml, findlib, jbuilder }:
+{ stdenv, fetchurl, ocaml, findlib, dune }:
 
 assert stdenv.lib.versionAtLeast (stdenv.lib.getVersion ocaml) "4.01";
 
@@ -14,11 +14,11 @@ stdenv.mkDerivation rec {
 
   unpackCmd = "tar xjf $src";
 
-  buildInputs = [ ocaml findlib jbuilder ];
+  buildInputs = [ ocaml findlib dune ];
 
-  buildPhase = "jbuilder build -p dtoa";
+  buildPhase = "dune build -p dtoa";
 
-  inherit (jbuilder) installPhase;
+  inherit (dune) installPhase;
 
   hardeningDisable = stdenv.lib.optional stdenv.isDarwin "strictoverflow";
 
diff --git a/pkgs/development/ocaml-modules/ezjsonm/default.nix b/pkgs/development/ocaml-modules/ezjsonm/default.nix
index 1dcafe4c6a48..d38cf51c1531 100644
--- a/pkgs/development/ocaml-modules/ezjsonm/default.nix
+++ b/pkgs/development/ocaml-modules/ezjsonm/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchzip, ocaml, findlib, jbuilder, jsonm, hex, sexplib }:
+{ stdenv, fetchzip, ocaml, findlib, dune, jsonm, hex, sexplib }:
 
 let version = "0.6.0"; in
 
@@ -10,12 +10,12 @@ stdenv.mkDerivation {
     sha256 = "18g64lhai0bz65b9fil12vlgfpwa9b5apj7x6d7n4zzm18qfazvj";
   };
 
-  buildInputs = [ ocaml findlib jbuilder ];
+  buildInputs = [ ocaml findlib dune ];
   propagatedBuildInputs = [ jsonm hex sexplib ];
 
-  buildPhase = "jbuilder build -p ezjsonm";
+  buildPhase = "dune build -p ezjsonm";
 
-  inherit (jbuilder) installPhase;
+  inherit (dune) installPhase;
 
   meta = {
     description = "An easy interface on top of the Jsonm library";
diff --git a/pkgs/development/ocaml-modules/faraday/default.nix b/pkgs/development/ocaml-modules/faraday/default.nix
index 8f30ec519777..6af808654f53 100644
--- a/pkgs/development/ocaml-modules/faraday/default.nix
+++ b/pkgs/development/ocaml-modules/faraday/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, ocaml, findlib, jbuilder, alcotest }:
+{ stdenv, fetchFromGitHub, ocaml, findlib, dune, alcotest }:
 
 if !stdenv.lib.versionAtLeast ocaml.version "4.02"
 then throw "faraday is not available for OCaml ${ocaml.version}"
@@ -15,14 +15,14 @@ stdenv.mkDerivation rec {
     sha256 = "1kql0il1frsbx6rvwqd7ahi4m14ik6la5an6c2w4x7k00ndm4d7n";
   };
 
-  buildInputs = [ ocaml findlib jbuilder alcotest ];
+  buildInputs = [ ocaml findlib dune alcotest ];
 
-  buildPhase = "jbuilder build -p faraday";
+  buildPhase = "dune build -p faraday";
 
   doCheck = true;
   checkPhase = "jbuilder runtest";
 
-  inherit (jbuilder) installPhase;
+  inherit (dune) installPhase;
 
   meta = {
     description = "Serialization library built for speed and memory efficiency";
diff --git a/pkgs/development/ocaml-modules/gapi-ocaml/default.nix b/pkgs/development/ocaml-modules/gapi-ocaml/default.nix
index 9c7be26503f5..bf7418ab27eb 100644
--- a/pkgs/development/ocaml-modules/gapi-ocaml/default.nix
+++ b/pkgs/development/ocaml-modules/gapi-ocaml/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, ocaml, findlib, jbuilder, ocurl, cryptokit, ocaml_extlib, yojson, ocamlnet, xmlm }:
+{ stdenv, fetchFromGitHub, ocaml, findlib, dune, ocurl, cryptokit, ocaml_extlib, yojson, ocamlnet, xmlm }:
 
 if !stdenv.lib.versionAtLeast ocaml.version "4.02"
 then throw "gapi-ocaml is not available for OCaml ${ocaml.version}"
@@ -13,10 +13,10 @@ stdenv.mkDerivation rec {
     rev = "v${version}";
     sha256 = "0qgsy51bhkpfgl5rdnjw4bqs5fbh2w4vwrfbl8y3lh1wrqmnwci4";
   };
-  buildInputs = [ ocaml jbuilder findlib ];
+  buildInputs = [ ocaml dune findlib ];
   propagatedBuildInputs = [ ocurl cryptokit ocaml_extlib yojson ocamlnet xmlm ];
 
-  inherit (jbuilder) installPhase;
+  inherit (dune) installPhase;
 
   meta = {
     description = "OCaml client for google services";
diff --git a/pkgs/development/ocaml-modules/git-http/default.nix b/pkgs/development/ocaml-modules/git-http/default.nix
index 5e757b5b6727..c6abb0171b03 100644
--- a/pkgs/development/ocaml-modules/git-http/default.nix
+++ b/pkgs/development/ocaml-modules/git-http/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, ocaml, findlib, jbuilder, git, cohttp-lwt
+{ stdenv, ocaml, findlib, dune, git, cohttp-lwt
 , alcotest, mtime, nocrypto
 }:
 
@@ -6,16 +6,16 @@ stdenv.mkDerivation rec {
 	name = "ocaml${ocaml.version}-git-http-${version}";
 	inherit (git) version src;
 
-	buildInputs = [ ocaml findlib jbuilder alcotest mtime nocrypto ];
+	buildInputs = [ ocaml findlib dune alcotest mtime nocrypto ];
 
 	propagatedBuildInputs = [ git cohttp-lwt ];
 
-	buildPhase = "jbuilder build -p git-http";
+	buildPhase = "dune build -p git-http";
 
-	inherit (jbuilder) installPhase;
+	inherit (dune) installPhase;
 
 	doCheck = true;
-	checkPhase = "jbuilder runtest -p git-http";
+	checkPhase = "dune runtest -p git-http";
 
 	meta = {
 		description = "Client implementation of the “Smart” HTTP Git protocol in pure OCaml";
diff --git a/pkgs/development/ocaml-modules/git-unix/default.nix b/pkgs/development/ocaml-modules/git-unix/default.nix
index afeb3f1957b0..7a796ca089d5 100644
--- a/pkgs/development/ocaml-modules/git-unix/default.nix
+++ b/pkgs/development/ocaml-modules/git-unix/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, ocaml, findlib, jbuilder, git-http
+{ stdenv, ocaml, findlib, dune, git-http
 , cohttp-lwt-unix
 , tls, cmdliner, mtime
 }:
@@ -7,13 +7,13 @@ stdenv.mkDerivation rec {
 	name = "ocaml${ocaml.version}-git-unix-${version}";
 	inherit (git-http) version src;
 
-	buildInputs = [ ocaml findlib jbuilder cmdliner mtime ];
+	buildInputs = [ ocaml findlib dune cmdliner mtime ];
 
 	propagatedBuildInputs = [ cohttp-lwt-unix git-http tls ];
 
-	buildPhase = "jbuilder build -p git-unix";
+	buildPhase = "dune build -p git-unix";
 
-	inherit (jbuilder) installPhase;
+	inherit (dune) installPhase;
 
 	meta = {
 		description = "Unix backend for the Git protocol(s)";
diff --git a/pkgs/development/ocaml-modules/git/default.nix b/pkgs/development/ocaml-modules/git/default.nix
index 0bf43174412c..777184ed2e94 100644
--- a/pkgs/development/ocaml-modules/git/default.nix
+++ b/pkgs/development/ocaml-modules/git/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, ocaml, findlib, jbuilder
+{ stdenv, fetchFromGitHub, ocaml, findlib, dune
 , astring, decompress, fmt, hex, logs, mstruct, ocaml_lwt, ocamlgraph, uri
 , alcotest, mtime, nocrypto
 }:
@@ -14,16 +14,16 @@ stdenv.mkDerivation rec {
 		sha256 = "0r1bxpxjjnl9hh8xbabsxl7svzvd19hfy73a2y1m4kljmw64dpfh";
 	};
 
-	buildInputs = [ ocaml findlib jbuilder alcotest mtime nocrypto ];
+	buildInputs = [ ocaml findlib dune alcotest mtime nocrypto ];
 
 	propagatedBuildInputs = [ astring decompress fmt hex logs mstruct ocaml_lwt ocamlgraph uri ];
 
-	buildPhase = "jbuilder build -p git";
+	buildPhase = "dune build -p git";
 
-	inherit (jbuilder) installPhase;
+	inherit (dune) installPhase;
 
 	doCheck = true;
-	checkPhase = "jbuilder runtest -p git";
+	checkPhase = "dune runtest -p git";
 
 	meta = {
 		description = "Git format and protocol in pure OCaml";
diff --git a/pkgs/development/ocaml-modules/hex/default.nix b/pkgs/development/ocaml-modules/hex/default.nix
index 596f6a0fa531..71a9ebf9ad5d 100644
--- a/pkgs/development/ocaml-modules/hex/default.nix
+++ b/pkgs/development/ocaml-modules/hex/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, ocaml, findlib, jbuilder, cstruct }:
+{ stdenv, fetchurl, ocaml, findlib, dune, cstruct }:
 
 if !stdenv.lib.versionAtLeast ocaml.version "4.02"
 then throw "hex is not available for OCaml ${ocaml.version}"
@@ -16,13 +16,13 @@ stdenv.mkDerivation {
 
   unpackCmd = "tar -xjf $curSrc";
 
-  buildInputs = [ ocaml findlib jbuilder ];
+  buildInputs = [ ocaml findlib dune ];
   propagatedBuildInputs = [ cstruct ];
 
-  buildPhase = "jbuilder build -p hex";
+  buildPhase = "dune build -p hex";
   doCheck = true;
   checkPhase = "jbuilder runtest";
-  inherit (jbuilder) installPhase;
+  inherit (dune) installPhase;
 
   meta = {
     description = "Mininal OCaml library providing hexadecimal converters";
diff --git a/pkgs/development/ocaml-modules/httpaf/default.nix b/pkgs/development/ocaml-modules/httpaf/default.nix
index bb712d40827e..e8638e4cf184 100644
--- a/pkgs/development/ocaml-modules/httpaf/default.nix
+++ b/pkgs/development/ocaml-modules/httpaf/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, ocaml, findlib, jbuilder
+{ stdenv, fetchFromGitHub, ocaml, findlib, dune
 , angstrom, faraday, alcotest
 }:
 
@@ -13,7 +13,7 @@ stdenv.mkDerivation rec {
     sha256 = "0i2r004ihj00hd97475y8nhjqjln58xx087zcjl0dfp0n7q80517";
   };
 
-  buildInputs = [ ocaml findlib jbuilder alcotest ];
+  buildInputs = [ ocaml findlib dune alcotest ];
   propagatedBuildInputs = [ angstrom faraday ];
 
   buildPhase = "dune build -p httpaf";
@@ -21,7 +21,7 @@ stdenv.mkDerivation rec {
   doCheck = true;
   checkPhase = "dune runtest -p httpaf";
 
-  inherit (jbuilder) installPhase;
+  inherit (dune) installPhase;
 
   meta = {
     description = "A high-performance, memory-efficient, and scalable web server for OCaml";
diff --git a/pkgs/development/ocaml-modules/io-page/default.nix b/pkgs/development/ocaml-modules/io-page/default.nix
index 72b7a3a54ce7..7c3d3a20c4d7 100644
--- a/pkgs/development/ocaml-modules/io-page/default.nix
+++ b/pkgs/development/ocaml-modules/io-page/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchzip, ocaml, findlib, jbuilder, configurator, cstruct }:
+{ stdenv, fetchzip, ocaml, findlib, dune, configurator, cstruct }:
 
 let version = "2.0.1"; in
 
@@ -10,10 +10,10 @@ stdenv.mkDerivation {
     sha256 = "1rw04dwrlx5hah5dkjf7d63iff82j9cifr8ifjis5pdwhgwcff8i";
   };
 
-  buildInputs = [ ocaml findlib jbuilder configurator ];
+  buildInputs = [ ocaml findlib dune configurator ];
   propagatedBuildInputs = [ cstruct ];
 
-  inherit (jbuilder) installPhase;
+  inherit (dune) installPhase;
 
   meta = {
     homepage = https://github.com/mirage/io-page;
diff --git a/pkgs/development/ocaml-modules/ipaddr/default.nix b/pkgs/development/ocaml-modules/ipaddr/default.nix
index 2f0aa3429950..9a12fb44fffb 100644
--- a/pkgs/development/ocaml-modules/ipaddr/default.nix
+++ b/pkgs/development/ocaml-modules/ipaddr/default.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchurl, ocaml, ocamlbuild, findlib
-, jbuilder, sexplib, ppx_sexp_conv
+, dune, sexplib, ppx_sexp_conv
 }:
 
 stdenv.mkDerivation rec {
@@ -11,10 +11,10 @@ stdenv.mkDerivation rec {
     sha256 = "1amb1pbm9ybpxy6190qygpj6nmbzzs2r6vx4xh5r6v89szx9rfxw";
   };
 
-  buildInputs = [ ocaml findlib ocamlbuild jbuilder ];
+  buildInputs = [ ocaml findlib ocamlbuild dune ];
   propagatedBuildInputs = [ ppx_sexp_conv sexplib ];
 
-  inherit (jbuilder) installPhase;
+  inherit (dune) installPhase;
 
   meta = with stdenv.lib; {
     homepage = https://github.com/mirage/ocaml-ipaddr;
diff --git a/pkgs/development/ocaml-modules/janestreet/janePackage.nix b/pkgs/development/ocaml-modules/janestreet/janePackage.nix
index d17e595199e1..439c6f500bc9 100644
--- a/pkgs/development/ocaml-modules/janestreet/janePackage.nix
+++ b/pkgs/development/ocaml-modules/janestreet/janePackage.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, ocaml, jbuilder, findlib, defaultVersion ? "0.11.0" }:
+{ stdenv, fetchFromGitHub, ocaml, dune, findlib, defaultVersion ? "0.11.0" }:
 
 { name, version ? defaultVersion, buildInputs ? [], hash, meta, ...}@args:
 
@@ -16,9 +16,9 @@ stdenv.mkDerivation (args // {
     sha256 = hash;
   };
 
-  buildInputs = [ ocaml jbuilder findlib ] ++ buildInputs;
+  buildInputs = [ ocaml dune findlib ] ++ buildInputs;
 
-  inherit (jbuilder) installPhase;
+  inherit (dune) installPhase;
 
   meta = {
     license = stdenv.lib.licenses.asl20;
diff --git a/pkgs/development/ocaml-modules/lambda-term/default.nix b/pkgs/development/ocaml-modules/lambda-term/default.nix
index 62b1f7b1a8e0..ba68c0463f8f 100644
--- a/pkgs/development/ocaml-modules/lambda-term/default.nix
+++ b/pkgs/development/ocaml-modules/lambda-term/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, libev, ocaml, findlib, jbuilder
+{ stdenv, fetchurl, libev, ocaml, findlib, dune
 , zed, lwt_log, lwt_react
 }:
 
@@ -13,13 +13,13 @@ stdenv.mkDerivation rec {
     sha256 = "1hy5ryagqclgdm9lzh1qil5mrynlypv7mn6qm858hdcnmz9zzn0l";
   };
 
-  buildInputs = [ libev ocaml findlib jbuilder ];
+  buildInputs = [ libev ocaml findlib dune ];
 
   propagatedBuildInputs = [ zed lwt_log lwt_react ];
 
-  buildPhase = "jbuilder build -p lambda-term";
+  buildPhase = "dune build -p lambda-term";
 
-  inherit (jbuilder) installPhase;
+  inherit (dune) installPhase;
 
   hasSharedObjects = true;
 
diff --git a/pkgs/development/ocaml-modules/linenoise/default.nix b/pkgs/development/ocaml-modules/linenoise/default.nix
index 53ac918c47e6..e7120ad38572 100644
--- a/pkgs/development/ocaml-modules/linenoise/default.nix
+++ b/pkgs/development/ocaml-modules/linenoise/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, ocaml, jbuilder, findlib, result }:
+{ stdenv, fetchFromGitHub, ocaml, dune, findlib, result }:
 
 if !stdenv.lib.versionAtLeast ocaml.version "4.02"
 then throw "linenoise is not available for OCaml ${ocaml.version}"
@@ -14,10 +14,10 @@ stdenv.mkDerivation rec {
     sha256 = "1h6rqfgmhmd7p5z8yhk6zkbrk4yzw1v2fgwas2b7g3hqs6y0xj0q";
   };
 
-  buildInputs = [ ocaml findlib jbuilder ];
+  buildInputs = [ ocaml findlib dune ];
   propagatedBuildInputs = [ result ];
 
-  inherit (jbuilder) installPhase;
+  inherit (dune) installPhase;
 
   meta = {
     description = "OCaml bindings to linenoise";
diff --git a/pkgs/development/ocaml-modules/lwt/default.nix b/pkgs/development/ocaml-modules/lwt/default.nix
index 739e6e1e43a8..c8371feb9052 100644
--- a/pkgs/development/ocaml-modules/lwt/default.nix
+++ b/pkgs/development/ocaml-modules/lwt/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchzip, pkgconfig, ncurses, libev, jbuilder
+{ stdenv, fetchzip, pkgconfig, ncurses, libev, dune
 , ocaml, findlib, cppo
 , ocaml-migrate-parsetree, ppx_tools_versioned, result
 , withP4 ? true
@@ -19,14 +19,14 @@ stdenv.mkDerivation rec {
   '';
 
   nativeBuildInputs = [ pkgconfig ];
-  buildInputs = [ ncurses ocaml findlib jbuilder cppo
+  buildInputs = [ ncurses ocaml findlib dune cppo
     ocaml-migrate-parsetree ppx_tools_versioned ]
   ++ stdenv.lib.optional withP4 camlp4;
   propagatedBuildInputs = [ libev result ];
 
   installPhase = ''
     ocaml src/util/install_filter.ml
-    ${jbuilder.installPhase}
+    ${dune.installPhase}
   '';
 
   meta = {
diff --git a/pkgs/development/ocaml-modules/lwt/ppx.nix b/pkgs/development/ocaml-modules/lwt/ppx.nix
index 3cf08d06f1eb..89e326557b5d 100644
--- a/pkgs/development/ocaml-modules/lwt/ppx.nix
+++ b/pkgs/development/ocaml-modules/lwt/ppx.nix
@@ -1,16 +1,16 @@
-{ stdenv, jbuilder, ocaml, findlib, lwt, ppx_tools_versioned }:
+{ stdenv, dune, ocaml, findlib, lwt, ppx_tools_versioned }:
 
 stdenv.mkDerivation {
   name = "ocaml${ocaml.version}-lwt_ppx-${lwt.version}";
 
   inherit (lwt) src;
 
-  buildInputs = [ jbuilder ocaml findlib ppx_tools_versioned ];
+  buildInputs = [ dune ocaml findlib ppx_tools_versioned ];
 
   propagatedBuildInputs = [ lwt ];
 
-  buildPhase = "jbuilder build -p lwt_ppx";
-  installPhase = "${jbuilder.installPhase} lwt_ppx.install";
+  buildPhase = "dune build -p lwt_ppx";
+  installPhase = "${dune.installPhase} lwt_ppx.install";
 
   meta = {
     description = "Ppx syntax extension for Lwt";
diff --git a/pkgs/development/ocaml-modules/lwt_log/default.nix b/pkgs/development/ocaml-modules/lwt_log/default.nix
index bdabe677a858..42ff2f26b7d3 100644
--- a/pkgs/development/ocaml-modules/lwt_log/default.nix
+++ b/pkgs/development/ocaml-modules/lwt_log/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, ocaml, findlib, jbuilder, lwt }:
+{ stdenv, ocaml, findlib, dune, lwt }:
 
 stdenv.mkDerivation rec {
   version = "1.0.0";
@@ -6,13 +6,13 @@ stdenv.mkDerivation rec {
 
   inherit (lwt) src;
 
-  buildInputs = [ ocaml findlib jbuilder ];
+  buildInputs = [ ocaml findlib dune ];
 
   propagatedBuildInputs = [ lwt ];
 
-  buildPhase = "jbuilder build -p lwt_log";
+  buildPhase = "dune build -p lwt_log";
 
-  inherit (jbuilder) installPhase;
+  inherit (dune) installPhase;
 
   meta = {
     description = "Lwt logging library (deprecated)";
diff --git a/pkgs/development/ocaml-modules/lwt_ssl/default.nix b/pkgs/development/ocaml-modules/lwt_ssl/default.nix
index e53c835a2911..8fbec7cd4dff 100644
--- a/pkgs/development/ocaml-modules/lwt_ssl/default.nix
+++ b/pkgs/development/ocaml-modules/lwt_ssl/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchzip, ocaml, findlib, jbuilder, ssl, lwt }:
+{ stdenv, fetchzip, ocaml, findlib, dune, ssl, lwt }:
 
 stdenv.mkDerivation rec {
   version = "1.1.2";
@@ -9,10 +9,10 @@ stdenv.mkDerivation rec {
     sha256 = "1q0an3djqjxv83v3iswi7m81braqx93kcrcwrxwmf6jzhdm4pn15";
   };
 
-  buildInputs = [ ocaml findlib jbuilder ];
+  buildInputs = [ ocaml findlib dune ];
   propagatedBuildInputs = [ ssl lwt ];
 
-  inherit (jbuilder) installPhase;
+  inherit (dune) installPhase;
 
   meta = {
     homepage = "https://github.com/aantron/lwt_ssl";
diff --git a/pkgs/development/ocaml-modules/mstruct/default.nix b/pkgs/development/ocaml-modules/mstruct/default.nix
index 5682b75d6a14..9184975f0698 100644
--- a/pkgs/development/ocaml-modules/mstruct/default.nix
+++ b/pkgs/development/ocaml-modules/mstruct/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, ocaml, findlib, jbuilder
+{ stdenv, fetchFromGitHub, ocaml, findlib, dune
 , cstruct
 }:
 
@@ -17,11 +17,11 @@ stdenv.mkDerivation rec {
 		sha256 = "1p4ygwzs3n1fj4apfib0z0sabpph21bkq1dgjk4bsa59pq4prncm";
 	};
 
-	buildInputs = [ ocaml findlib jbuilder ];
+	buildInputs = [ ocaml findlib dune ];
 
 	propagatedBuildInputs = [ cstruct ];
 
-	inherit (jbuilder) installPhase;
+	inherit (dune) installPhase;
 
 	meta = {
 		description = "A thin mutable layer on top of cstruct";
diff --git a/pkgs/development/ocaml-modules/ocaml-migrate-parsetree/default.nix b/pkgs/development/ocaml-modules/ocaml-migrate-parsetree/default.nix
index 9a2af140e312..131f478d32ed 100644
--- a/pkgs/development/ocaml-modules/ocaml-migrate-parsetree/default.nix
+++ b/pkgs/development/ocaml-modules/ocaml-migrate-parsetree/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, ocaml, findlib, ocamlbuild, jbuilder, result }:
+{ stdenv, fetchFromGitHub, ocaml, findlib, ocamlbuild, dune, result }:
 
 if !stdenv.lib.versionAtLeast ocaml.version "4.02"
 then throw "ocaml-migrate-parsetree is not available for OCaml ${ocaml.version}"
@@ -15,10 +15,10 @@ stdenv.mkDerivation rec {
      sha256 = "05kbgs9n1x64fk6g3wbjnwjd17w10k3k8dzglnc45xg4hr7z651n";
    };
 
-   buildInputs = [ ocaml findlib ocamlbuild jbuilder ];
+   buildInputs = [ ocaml findlib ocamlbuild dune ];
    propagatedBuildInputs = [ result ];
 
-   inherit (jbuilder) installPhase;
+   inherit (dune) installPhase;
 
    meta = {
      description = "Convert OCaml parsetrees between different major versions";
diff --git a/pkgs/development/ocaml-modules/ppx_blob/default.nix b/pkgs/development/ocaml-modules/ppx_blob/default.nix
index 45dd73d4a321..72e0e5e121ad 100644
--- a/pkgs/development/ocaml-modules/ppx_blob/default.nix
+++ b/pkgs/development/ocaml-modules/ppx_blob/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, ocaml, findlib, jbuilder, alcotest
+{ stdenv, fetchurl, ocaml, findlib, dune, alcotest
 , ocaml-migrate-parsetree
 }:
 
@@ -13,14 +13,14 @@ stdenv.mkDerivation rec {
 
   unpackCmd = "tar xjf $curSrc";
 
-  buildInputs = [ ocaml findlib jbuilder alcotest ocaml-migrate-parsetree ];
+  buildInputs = [ ocaml findlib dune alcotest ocaml-migrate-parsetree ];
 
   buildPhase = "dune build -p ppx_blob";
 
   doCheck = true;
   checkPhase = "dune runtest -p ppx_blob";
 
-  inherit (jbuilder) installPhase;
+  inherit (dune) installPhase;
 
   meta = with stdenv.lib; {
     homepage = https://github.com/johnwhitington/ppx_blob;
diff --git a/pkgs/development/ocaml-modules/ppx_derivers/default.nix b/pkgs/development/ocaml-modules/ppx_derivers/default.nix
index 2dc7ef2b13e5..edd086067610 100644
--- a/pkgs/development/ocaml-modules/ppx_derivers/default.nix
+++ b/pkgs/development/ocaml-modules/ppx_derivers/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, ocaml, findlib, jbuilder }:
+{ stdenv, fetchFromGitHub, ocaml, findlib, dune }:
 
 if !stdenv.lib.versionAtLeast ocaml.version "4.02"
 then throw "ppx_derivers is not available for OCaml ${ocaml.version}"
@@ -15,9 +15,9 @@ stdenv.mkDerivation rec {
 		sha256 = "0bnhihl1w31as5w2czly1v3d6pbir9inmgsjg2cj6aaj9v1dzd85";
 	};
 
-	buildInputs = [ ocaml findlib jbuilder ];
+	buildInputs = [ ocaml findlib dune ];
 
-	inherit (jbuilder) installPhase;
+	inherit (dune) installPhase;
 
 	meta = {
 		description = "Shared [@@deriving] plugin registry";
diff --git a/pkgs/development/ocaml-modules/ppx_gen_rec/default.nix b/pkgs/development/ocaml-modules/ppx_gen_rec/default.nix
index 39b0c53e0e94..4c458b983d33 100644
--- a/pkgs/development/ocaml-modules/ppx_gen_rec/default.nix
+++ b/pkgs/development/ocaml-modules/ppx_gen_rec/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, ocaml, findlib, jbuilder, ocaml-migrate-parsetree }:
+{ stdenv, fetchurl, ocaml, findlib, dune, ocaml-migrate-parsetree }:
 
 assert stdenv.lib.versionAtLeast (stdenv.lib.getVersion ocaml) "4.01";
 
@@ -14,11 +14,11 @@ stdenv.mkDerivation rec {
 
   unpackCmd = "tar xjf $src";
 
-  buildInputs = [ ocaml findlib jbuilder ocaml-migrate-parsetree ];
+  buildInputs = [ ocaml findlib dune ocaml-migrate-parsetree ];
 
-  buildPhase = "jbuilder build -p ppx_gen_rec";
+  buildPhase = "dune build -p ppx_gen_rec";
 
-  inherit (jbuilder) installPhase;
+  inherit (dune) installPhase;
 
   meta = with stdenv.lib; {
     homepage = https://github.com/flowtype/ocaml-ppx_gen_rec;
diff --git a/pkgs/development/ocaml-modules/ppxlib/default.nix b/pkgs/development/ocaml-modules/ppxlib/default.nix
index 889e4acd2b50..656b650b13f7 100644
--- a/pkgs/development/ocaml-modules/ppxlib/default.nix
+++ b/pkgs/development/ocaml-modules/ppxlib/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, ocaml, findlib, jbuilder
+{ stdenv, fetchFromGitHub, ocaml, findlib, dune
 , ocaml-compiler-libs, ocaml-migrate-parsetree, ppx_derivers, stdio
 }:
 
@@ -13,15 +13,15 @@ stdenv.mkDerivation rec {
     sha256 = "0csp49jh7zgjnqh46mxbf322whlbmgy7v1a12nvxh97qg6i5fvsy";
   };
 
-  buildInputs = [ ocaml findlib jbuilder ];
+  buildInputs = [ ocaml findlib dune ];
 
   propagatedBuildInputs = [
     ocaml-compiler-libs ocaml-migrate-parsetree ppx_derivers stdio
   ];
 
-  buildPhase = "jbuilder build";
+  buildPhase = "dune build";
 
-  inherit (jbuilder) installPhase;
+  inherit (dune) installPhase;
 
   meta = {
     description = "Comprehensive ppx tool set";
diff --git a/pkgs/development/ocaml-modules/re/default.nix b/pkgs/development/ocaml-modules/re/default.nix
index 4994ceca7fb3..c4215b98a50f 100644
--- a/pkgs/development/ocaml-modules/re/default.nix
+++ b/pkgs/development/ocaml-modules/re/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchzip, ocaml, findlib, jbuilder, ounit, seq }:
+{ stdenv, fetchzip, ocaml, findlib, dune, ounit, seq }:
 
 if !stdenv.lib.versionAtLeast ocaml.version "4.02"
 then throw "re is not available for OCaml ${ocaml.version}"
@@ -13,13 +13,13 @@ stdenv.mkDerivation rec {
     sha256 = "0ch6hvmm4ym3w2vghjxf3ka5j1023a37980fqi4zcb7sx756z20i";
   };
 
-  buildInputs = [ ocaml findlib jbuilder ounit ];
+  buildInputs = [ ocaml findlib dune ounit ];
   propagatedBuildInputs = [ seq ];
 
   doCheck = true;
   checkPhase = "jbuilder runtest";
 
-  inherit (jbuilder) installPhase;
+  inherit (dune) installPhase;
 
   meta = {
     homepage = https://github.com/ocaml/ocaml-re;
diff --git a/pkgs/development/ocaml-modules/rope/default.nix b/pkgs/development/ocaml-modules/rope/default.nix
index dfb8c56c23e8..9e9ebea6b6a7 100644
--- a/pkgs/development/ocaml-modules/rope/default.nix
+++ b/pkgs/development/ocaml-modules/rope/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, ocaml, findlib, ocamlbuild, jbuilder, benchmark }:
+{ stdenv, fetchurl, ocaml, findlib, ocamlbuild, dune, benchmark }:
 
 let param =
   if stdenv.lib.versionAtLeast ocaml.version "4.03"
@@ -6,11 +6,11 @@ let param =
     version = "0.6";
     url = " https://github.com/Chris00/ocaml-rope/releases/download/0.6/rope-0.6.tbz";
     sha256 = "06pkbnkad2ck50jn59ggwv154yd9vb01abblihvam6p27m4za1pc";
-    buildInputs = [ jbuilder ];
+    buildInputs = [ dune ];
     extra = {
       unpackCmd = "tar -xjf $curSrc";
-      buildPhase = "jbuilder build -p rope";
-      inherit (jbuilder) installPhase;
+      buildPhase = "dune build -p rope";
+      inherit (dune) installPhase;
     };
   } else {
     version = "0.5";
diff --git a/pkgs/development/ocaml-modules/sequence/default.nix b/pkgs/development/ocaml-modules/sequence/default.nix
index f06282df4fc6..59641458338f 100644
--- a/pkgs/development/ocaml-modules/sequence/default.nix
+++ b/pkgs/development/ocaml-modules/sequence/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, ocaml, findlib, jbuilder, qtest, result }:
+{ stdenv, fetchFromGitHub, ocaml, findlib, dune, qtest, result }:
 
 if !stdenv.lib.versionAtLeast ocaml.version "4.02"
 then throw "sequence is not available for OCaml ${ocaml.version}"
@@ -16,13 +16,13 @@ stdenv.mkDerivation {
     sha256 = "08j37nldw47syq3yw4mzhhvya43knl0d7biddp0q9hwbaxhzgi44";
   };
 
-  buildInputs = [ ocaml findlib jbuilder qtest ];
+  buildInputs = [ ocaml findlib dune qtest ];
   propagatedBuildInputs = [ result ];
 
   doCheck = true;
-  checkPhase = "jbuilder runtest";
+  checkPhase = "dune runtest";
 
-  inherit (jbuilder) installPhase;
+  inherit (dune) installPhase;
 
   meta = {
     homepage = https://github.com/c-cube/sequence;
diff --git a/pkgs/development/ocaml-modules/sqlexpr/default.nix b/pkgs/development/ocaml-modules/sqlexpr/default.nix
index c7ed72dc523c..cad4dcafb642 100644
--- a/pkgs/development/ocaml-modules/sqlexpr/default.nix
+++ b/pkgs/development/ocaml-modules/sqlexpr/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, ocaml, findlib, jbuilder, ocaml_lwt
+{ stdenv, fetchurl, ocaml, findlib, dune, ocaml_lwt
 , lwt_ppx, ocaml-migrate-parsetree, ppx_tools_versioned, csv, ocaml_sqlite3
 }:
 
@@ -11,7 +11,7 @@ stdenv.mkDerivation rec {
   sha256 = "0z0bkzi1mh0m39alzr2ds7hjpfxffx6azpfsj2wpaxrg64ks8ypd";
   };
 
-  buildInputs = [ ocaml findlib jbuilder lwt_ppx ocaml-migrate-parsetree ppx_tools_versioned ];
+  buildInputs = [ ocaml findlib dune lwt_ppx ocaml-migrate-parsetree ppx_tools_versioned ];
 
   propagatedBuildInputs = [ ocaml_lwt csv ocaml_sqlite3 ];
 
@@ -20,7 +20,7 @@ stdenv.mkDerivation rec {
   doCheck = true;
   checkPhase = "dune runtest -p sqlexpr";
 
-  inherit (jbuilder) installPhase;
+  inherit (dune) installPhase;
 
   meta = {
     description = "Type-safe, convenient SQLite database access";
diff --git a/pkgs/development/ocaml-modules/sqlexpr/ppx.nix b/pkgs/development/ocaml-modules/sqlexpr/ppx.nix
index c15378e8240a..b908e173257c 100644
--- a/pkgs/development/ocaml-modules/sqlexpr/ppx.nix
+++ b/pkgs/development/ocaml-modules/sqlexpr/ppx.nix
@@ -1,4 +1,4 @@
-{ stdenv, ocaml, findlib, jbuilder, sqlexpr, ounit
+{ stdenv, ocaml, findlib, dune, sqlexpr, ounit
 , ppx_core, ppx_tools_versioned, re, lwt_ppx
 }:
 
@@ -6,7 +6,7 @@ stdenv.mkDerivation rec {
   name = "ocaml${ocaml.version}-ppx_sqlexpr-${version}";
   inherit (sqlexpr) version src installPhase meta;
 
-  buildInputs = [ ocaml findlib jbuilder sqlexpr ounit ppx_core ppx_tools_versioned re lwt_ppx ];
+  buildInputs = [ ocaml findlib dune sqlexpr ounit ppx_core ppx_tools_versioned re lwt_ppx ];
 
   buildPhase = "dune build -p ppx_sqlexpr";
 
diff --git a/pkgs/development/ocaml-modules/uri/default.nix b/pkgs/development/ocaml-modules/uri/default.nix
index c846cca1282f..4959ef7b34a7 100644
--- a/pkgs/development/ocaml-modules/uri/default.nix
+++ b/pkgs/development/ocaml-modules/uri/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, ocaml, findlib, jbuilder, ppx_sexp_conv, ounit
+{ stdenv, fetchurl, ocaml, findlib, dune, ppx_sexp_conv, ounit
 , re, sexplib, stringext
 }:
 
@@ -13,7 +13,7 @@ stdenv.mkDerivation rec {
 
   unpackCmd = "tar -xjf $curSrc";
 
-  buildInputs = [ ocaml findlib jbuilder ounit ];
+  buildInputs = [ ocaml findlib dune ounit ];
   propagatedBuildInputs = [ ppx_sexp_conv re sexplib stringext ];
 
   buildPhase = "jbuilder build";
@@ -21,7 +21,7 @@ stdenv.mkDerivation rec {
   doCheck = true;
   checkPhase = "jbuilder runtest";
 
-  inherit (jbuilder) installPhase;
+  inherit (dune) installPhase;
 
   meta = {
     homepage = "https://github.com/mirage/ocaml-uri";
diff --git a/pkgs/development/ocaml-modules/wtf8/default.nix b/pkgs/development/ocaml-modules/wtf8/default.nix
index 4cde95c0c4cc..58ce7778c417 100644
--- a/pkgs/development/ocaml-modules/wtf8/default.nix
+++ b/pkgs/development/ocaml-modules/wtf8/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, ocaml, findlib, jbuilder }:
+{ stdenv, fetchurl, ocaml, findlib, dune }:
 
 assert stdenv.lib.versionAtLeast (stdenv.lib.getVersion ocaml) "4.01";
 
@@ -14,13 +14,11 @@ stdenv.mkDerivation rec {
 
   unpackCmd = "tar xjf $src";
 
-  buildInputs = [ ocaml findlib jbuilder ];
+  buildInputs = [ ocaml findlib dune ];
 
-  buildPhase = "jbuilder build -p wtf8";
+  buildPhase = "dune build -p wtf8";
 
-  inherit (jbuilder) installPhase;
-
-  createFindLibDestdir = true;
+  inherit (dune) installPhase;
 
   meta = with stdenv.lib; {
     homepage = https://github.com/flowtype/ocaml-wtf8;
diff --git a/pkgs/development/ocaml-modules/yojson/default.nix b/pkgs/development/ocaml-modules/yojson/default.nix
index f494a8cf17cc..dfef72835cc1 100644
--- a/pkgs/development/ocaml-modules/yojson/default.nix
+++ b/pkgs/development/ocaml-modules/yojson/default.nix
@@ -1,12 +1,12 @@
-{ stdenv, fetchzip, ocaml, findlib, jbuilder, cppo, easy-format, biniou }:
+{ stdenv, fetchzip, ocaml, findlib, dune, cppo, easy-format, biniou }:
 let
   pname = "yojson";
   param =
   if stdenv.lib.versionAtLeast ocaml.version "4.02" then {
     version = "1.4.1";
     sha256 = "0nwsfkmqpyfab4rxq76q8ff7giyanghw08094jyrp275v99zdjr9";
-    buildInputs = [ jbuilder ];
-    extra = { inherit (jbuilder) installPhase; };
+    buildInputs = [ dune ];
+    extra = { inherit (dune) installPhase; };
   } else {
     version = "1.2.3";
     sha256 = "10dvkndgwanvw4agbjln7kgb1n9s6lii7jw82kwxczl5rd1sgmvl";
diff --git a/pkgs/development/ocaml-modules/zed/default.nix b/pkgs/development/ocaml-modules/zed/default.nix
index 1ddb6d180405..d9dcf1a53851 100644
--- a/pkgs/development/ocaml-modules/zed/default.nix
+++ b/pkgs/development/ocaml-modules/zed/default.nix
@@ -1,14 +1,14 @@
-{ stdenv, fetchzip, ocaml, findlib, ocamlbuild, camomile, react, jbuilder }:
+{ stdenv, fetchzip, ocaml, findlib, ocamlbuild, camomile, react, dune }:
 
 let param =
   if stdenv.lib.versionAtLeast ocaml.version "4.02" then
   {
     version = "1.6";
     sha256 = "00hhxcjf3bj3w2qm8nzs9x6vrqkadf4i0277s5whzy2rmiknj63v";
-    buildInputs = [ jbuilder ];
+    buildInputs = [ dune ];
     extra = {
-     buildPhase = "jbuilder build -p zed";
-     inherit (jbuilder) installPhase; };
+     buildPhase = "dune build -p zed";
+     inherit (dune) installPhase; };
   } else {
     version = "1.4";
     sha256 = "0d8qfy0qiydrrqi8qc9rcwgjigql6vx9gl4zp62jfz1lmjgb2a3w";
diff --git a/pkgs/development/tools/ocaml/cppo/default.nix b/pkgs/development/tools/ocaml/cppo/default.nix
index d7d086e74f97..0611ec8d3bbd 100644
--- a/pkgs/development/tools/ocaml/cppo/default.nix
+++ b/pkgs/development/tools/ocaml/cppo/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, ocaml, findlib, ocamlbuild, jbuilder }:
+{ stdenv, fetchFromGitHub, ocaml, findlib, ocamlbuild, dune }:
 let
   pname = "cppo";
   webpage = "http://mjambon.com/${pname}.html";
@@ -9,9 +9,9 @@ let param =
   if stdenv.lib.versionAtLeast ocaml.version "4.02" then {
     version = "1.6.4";
     sha256 = "16mlwck0wngr5pmlr8dxc471zzhhcja3mv4xf4n8jm9nhb3iikvh";
-    buildInputs = [ jbuilder ];
+    buildInputs = [ dune ];
     extra = {
-      inherit (jbuilder) installPhase;
+      inherit (dune) installPhase;
     };
   } else {
     version = "1.5.0";
diff --git a/pkgs/development/tools/ocaml/jbuilder/default.nix b/pkgs/development/tools/ocaml/dune/default.nix
similarity index 78%
rename from pkgs/development/tools/ocaml/jbuilder/default.nix
rename to pkgs/development/tools/ocaml/dune/default.nix
index c30478132cf2..a9ed66a8efe1 100644
--- a/pkgs/development/tools/ocaml/jbuilder/default.nix
+++ b/pkgs/development/tools/ocaml/dune/default.nix
@@ -1,13 +1,13 @@
 { stdenv, fetchFromGitHub, ocamlPackages, opaline }:
 
 stdenv.mkDerivation rec {
-  name = "jbuilder-${version}";
-  version = "1.0.1";
+  name = "dune-${version}";
+  version = "1.1.1";
   src = fetchFromGitHub {
     owner = "ocaml";
     repo = "dune";
     rev = "${version}";
-    sha256 = "0k6r9qrbwlnb4rqwqys5fr7khwza7n7d8wpgl9jbb3xpag2zl3q9";
+    sha256 = "0v2pnxpmqsvrvidpwxvbsypzhqfdnjs5crjp9y61qi8nyj8d75zw";
   };
 
   buildInputs = with ocamlPackages; [ ocaml findlib ];
@@ -16,8 +16,6 @@ stdenv.mkDerivation rec {
 
   installPhase = "${opaline}/bin/opaline -prefix $out -libdir $OCAMLFIND_DESTDIR";
 
-  preFixup = "rm -rf $out/jbuilder";
-
   meta = {
     inherit (src.meta) homepage;
     description = "Fast, portable and opinionated build system";
diff --git a/pkgs/development/tools/ocaml/js_of_ocaml/3.0.nix b/pkgs/development/tools/ocaml/js_of_ocaml/3.0.nix
index d8c289015b2f..1307635abb99 100644
--- a/pkgs/development/tools/ocaml/js_of_ocaml/3.0.nix
+++ b/pkgs/development/tools/ocaml/js_of_ocaml/3.0.nix
@@ -1,4 +1,4 @@
-{ stdenv, ocaml, findlib, jbuilder, js_of_ocaml-compiler
+{ stdenv, ocaml, findlib, dune, js_of_ocaml-compiler
 , ocaml-migrate-parsetree, ppx_tools_versioned, uchar
 }:
 
@@ -7,11 +7,11 @@ stdenv.mkDerivation rec {
 
 	inherit (js_of_ocaml-compiler) version src installPhase meta;
 
-	buildInputs = [ ocaml findlib jbuilder ocaml-migrate-parsetree ppx_tools_versioned ];
+	buildInputs = [ ocaml findlib dune ocaml-migrate-parsetree ppx_tools_versioned ];
 
   postPatch = "patchShebangs lib/generate_stubs.sh";
 
 	propagatedBuildInputs = [ js_of_ocaml-compiler uchar ];
 
-	buildPhase = "jbuilder build -p js_of_ocaml";
+	buildPhase = "dune build -p js_of_ocaml";
 }
diff --git a/pkgs/development/tools/ocaml/js_of_ocaml/camlp4.nix b/pkgs/development/tools/ocaml/js_of_ocaml/camlp4.nix
index 3caeabaae78b..139ffef186b5 100644
--- a/pkgs/development/tools/ocaml/js_of_ocaml/camlp4.nix
+++ b/pkgs/development/tools/ocaml/js_of_ocaml/camlp4.nix
@@ -1,4 +1,4 @@
-{ stdenv, ocaml, findlib, jbuilder, js_of_ocaml-compiler
+{ stdenv, ocaml, findlib, dune, js_of_ocaml-compiler
 , camlp4, ocsigen_deriving
 }:
 
@@ -7,7 +7,7 @@ stdenv.mkDerivation rec {
 
 	inherit (js_of_ocaml-compiler) version src installPhase meta;
 
-	buildInputs = [ ocaml findlib jbuilder camlp4 ocsigen_deriving ];
+	buildInputs = [ ocaml findlib dune camlp4 ocsigen_deriving ];
 
-	buildPhase = "jbuilder build -p js_of_ocaml-camlp4";
+	buildPhase = "dune build -p js_of_ocaml-camlp4";
 }
diff --git a/pkgs/development/tools/ocaml/js_of_ocaml/compiler.nix b/pkgs/development/tools/ocaml/js_of_ocaml/compiler.nix
index 798013045955..cd242b5bd377 100644
--- a/pkgs/development/tools/ocaml/js_of_ocaml/compiler.nix
+++ b/pkgs/development/tools/ocaml/js_of_ocaml/compiler.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, ocaml, findlib, jbuilder
+{ stdenv, fetchFromGitHub, ocaml, findlib, dune
 , cmdliner, cppo, yojson
 }:
 
@@ -17,13 +17,13 @@ stdenv.mkDerivation rec {
 		sha256 = "0dxxdxgrbg9xvvi3i627krnk6rb1ja0ypp2diwdkpnmy45wak9lv";
 	};
 
-	buildInputs = [ ocaml findlib jbuilder cmdliner cppo ];
+	buildInputs = [ ocaml findlib dune cmdliner cppo ];
 
 	propagatedBuildInputs = [ yojson ];
 
-	buildPhase = "jbuilder build -p js_of_ocaml-compiler";
+	buildPhase = "dune build -p js_of_ocaml-compiler";
 
-	inherit (jbuilder) installPhase;
+	inherit (dune) installPhase;
 
 	meta = {
 		description = "Compiler from OCaml bytecode to Javascript";
diff --git a/pkgs/development/tools/ocaml/js_of_ocaml/lwt.nix b/pkgs/development/tools/ocaml/js_of_ocaml/lwt.nix
index 5ec8cca344d4..e7a31c1ce2e5 100644
--- a/pkgs/development/tools/ocaml/js_of_ocaml/lwt.nix
+++ b/pkgs/development/tools/ocaml/js_of_ocaml/lwt.nix
@@ -1,4 +1,4 @@
-{ stdenv, ocaml, findlib, jbuilder, js_of_ocaml-compiler, js_of_ocaml-ppx
+{ stdenv, ocaml, findlib, dune, js_of_ocaml-compiler, js_of_ocaml-ppx
 , ocaml-migrate-parsetree, ppx_tools_versioned
 , js_of_ocaml, ocaml_lwt, lwt_log
 }:
@@ -8,9 +8,9 @@ stdenv.mkDerivation rec {
 
 	inherit (js_of_ocaml-compiler) version src installPhase meta;
 
-	buildInputs = [ ocaml findlib jbuilder js_of_ocaml-ppx ocaml-migrate-parsetree ppx_tools_versioned ];
+	buildInputs = [ ocaml findlib dune js_of_ocaml-ppx ocaml-migrate-parsetree ppx_tools_versioned ];
 
 	propagatedBuildInputs = [ js_of_ocaml ocaml_lwt lwt_log ];
 
-	buildPhase = "jbuilder build -p js_of_ocaml-lwt";
+	buildPhase = "dune build -p js_of_ocaml-lwt";
 }
diff --git a/pkgs/development/tools/ocaml/js_of_ocaml/ocamlbuild.nix b/pkgs/development/tools/ocaml/js_of_ocaml/ocamlbuild.nix
index 60ad695dc0bd..bf33b4e59e52 100644
--- a/pkgs/development/tools/ocaml/js_of_ocaml/ocamlbuild.nix
+++ b/pkgs/development/tools/ocaml/js_of_ocaml/ocamlbuild.nix
@@ -1,4 +1,4 @@
-{ stdenv, ocaml, findlib, jbuilder, js_of_ocaml-compiler
+{ stdenv, ocaml, findlib, dune, js_of_ocaml-compiler
 , ocamlbuild
 }:
 
@@ -7,9 +7,9 @@ stdenv.mkDerivation rec {
 
 	inherit (js_of_ocaml-compiler) version src installPhase meta;
 
-	buildInputs = [ ocaml findlib jbuilder ];
+	buildInputs = [ ocaml findlib dune ];
 
 	propagatedBuildInputs = [ ocamlbuild ];
 
-	buildPhase = "jbuilder build -p js_of_ocaml-ocamlbuild";
+	buildPhase = "dune build -p js_of_ocaml-ocamlbuild";
 }
diff --git a/pkgs/development/tools/ocaml/js_of_ocaml/ppx.nix b/pkgs/development/tools/ocaml/js_of_ocaml/ppx.nix
index 4f6b281c8b96..0649aee162a5 100644
--- a/pkgs/development/tools/ocaml/js_of_ocaml/ppx.nix
+++ b/pkgs/development/tools/ocaml/js_of_ocaml/ppx.nix
@@ -1,4 +1,4 @@
-{ stdenv, ocaml, findlib, jbuilder, js_of_ocaml-compiler
+{ stdenv, ocaml, findlib, dune, js_of_ocaml-compiler
 , ocaml-migrate-parsetree, ppx_tools_versioned
 , js_of_ocaml
 }:
@@ -8,7 +8,7 @@ stdenv.mkDerivation rec {
 
 	inherit (js_of_ocaml-compiler) version src installPhase meta;
 
-	buildInputs = [ ocaml findlib jbuilder ocaml-migrate-parsetree ppx_tools_versioned js_of_ocaml ];
+	buildInputs = [ ocaml findlib dune ocaml-migrate-parsetree ppx_tools_versioned js_of_ocaml ];
 
-	buildPhase = "jbuilder build -p js_of_ocaml-ppx";
+	buildPhase = "dune build -p js_of_ocaml-ppx";
 }
diff --git a/pkgs/development/tools/ocaml/js_of_ocaml/ppx_deriving_json.nix b/pkgs/development/tools/ocaml/js_of_ocaml/ppx_deriving_json.nix
index 8f32887c5bf5..ddea73b3c766 100644
--- a/pkgs/development/tools/ocaml/js_of_ocaml/ppx_deriving_json.nix
+++ b/pkgs/development/tools/ocaml/js_of_ocaml/ppx_deriving_json.nix
@@ -1,4 +1,4 @@
-{ stdenv, ocaml, findlib, jbuilder, js_of_ocaml-compiler
+{ stdenv, ocaml, findlib, dune, js_of_ocaml-compiler
 , js_of_ocaml, ppx_deriving
 }:
 
@@ -7,9 +7,9 @@ stdenv.mkDerivation rec {
 
 	inherit (js_of_ocaml-compiler) version src installPhase meta;
 
-	buildInputs = [ ocaml findlib jbuilder ];
+	buildInputs = [ ocaml findlib dune ];
 
 	propagatedBuildInputs = [ js_of_ocaml ppx_deriving ];
 
-	buildPhase = "jbuilder build -p js_of_ocaml-ppx_deriving_json";
+	buildPhase = "dune build -p js_of_ocaml-ppx_deriving_json";
 }
diff --git a/pkgs/development/tools/ocaml/js_of_ocaml/tyxml.nix b/pkgs/development/tools/ocaml/js_of_ocaml/tyxml.nix
index 041fd71f92fa..1ba9ddd0ab7f 100644
--- a/pkgs/development/tools/ocaml/js_of_ocaml/tyxml.nix
+++ b/pkgs/development/tools/ocaml/js_of_ocaml/tyxml.nix
@@ -1,4 +1,4 @@
-{ stdenv, ocaml, findlib, jbuilder, js_of_ocaml-compiler
+{ stdenv, ocaml, findlib, dune, js_of_ocaml-compiler
 , js_of_ocaml-ppx, ocaml-migrate-parsetree, ppx_tools_versioned
 , js_of_ocaml, reactivedata, tyxml
 }:
@@ -8,9 +8,9 @@ stdenv.mkDerivation rec {
 
 	inherit (js_of_ocaml-compiler) version src installPhase meta;
 
-	buildInputs = [ ocaml findlib jbuilder js_of_ocaml-ppx ocaml-migrate-parsetree ppx_tools_versioned ];
+	buildInputs = [ ocaml findlib dune js_of_ocaml-ppx ocaml-migrate-parsetree ppx_tools_versioned ];
 
 	propagatedBuildInputs = [ js_of_ocaml reactivedata tyxml ];
 
-	buildPhase = "jbuilder build -p js_of_ocaml-tyxml";
+	buildPhase = "dune build -p js_of_ocaml-tyxml";
 }
diff --git a/pkgs/development/tools/ocaml/ocaml-top/default.nix b/pkgs/development/tools/ocaml/ocaml-top/default.nix
index 744a136c9ef2..ddea2aa9784b 100644
--- a/pkgs/development/tools/ocaml/ocaml-top/default.nix
+++ b/pkgs/development/tools/ocaml/ocaml-top/default.nix
@@ -1,6 +1,7 @@
 { stdenv, fetchzip, ncurses
 , ocamlPackages
-, jbuilder }:
+, dune
+}:
 
 stdenv.mkDerivation rec {
   version = "1.1.5";
@@ -10,7 +11,7 @@ stdenv.mkDerivation rec {
     sha256 = "1d4i6aanrafgrgk4mh154k6lkwk0b6mh66rykz33awlf5pfqd8yv";
   };
 
-  buildInputs = [ ncurses jbuilder ]
+  buildInputs = [ ncurses dune ]
   ++ (with ocamlPackages; [ ocaml ocp-build findlib lablgtk ocp-index ]);
 
   configurePhase = ''
@@ -20,7 +21,7 @@ stdenv.mkDerivation rec {
 
   buildPhase = "jbuilder build";
 
-  inherit (jbuilder) installPhase;
+  inherit (dune) installPhase;
 
   meta = {
     homepage = https://www.typerex.org/ocaml-top.html;
diff --git a/pkgs/development/tools/ocaml/ocp-indent/default.nix b/pkgs/development/tools/ocaml/ocp-indent/default.nix
index 43898d250d91..2cffccdbfcdf 100644
--- a/pkgs/development/tools/ocaml/ocp-indent/default.nix
+++ b/pkgs/development/tools/ocaml/ocp-indent/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchzip, ocaml, findlib, jbuilder, ocp-build, cmdliner }:
+{ stdenv, fetchzip, ocaml, findlib, dune, ocp-build, cmdliner }:
 
 let inherit (stdenv.lib) getVersion versionAtLeast; in
 
@@ -19,7 +19,7 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ ocp-build ];
   buildInputs = [ ocaml findlib cmdliner ];
 
-  inherit (jbuilder) installPhase;
+  inherit (dune) installPhase;
 
   meta = with stdenv.lib; {
     homepage = http://typerex.ocamlpro.com/ocp-indent.html;
diff --git a/pkgs/development/tools/ocaml/ocp-index/default.nix b/pkgs/development/tools/ocaml/ocp-index/default.nix
index 0a63ae805342..b041efefac77 100644
--- a/pkgs/development/tools/ocaml/ocp-index/default.nix
+++ b/pkgs/development/tools/ocaml/ocp-index/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, ocaml, findlib, jbuilder, ocp-build, ocp-indent, cmdliner, re }:
+{ stdenv, fetchFromGitHub, ocaml, findlib, dune, ocp-build, ocp-indent, cmdliner, re }:
 
 stdenv.mkDerivation rec {
 
@@ -12,12 +12,12 @@ stdenv.mkDerivation rec {
     sha256 = "0p367aphz9w71qbm3y47qwhgqmyai28l96i1ifb6kg7awph5qmj3";
   };
 
-  buildInputs = [ ocaml findlib jbuilder ocp-build cmdliner re ];
+  buildInputs = [ ocaml findlib dune ocp-build cmdliner re ];
   propagatedBuildInputs = [ ocp-indent ];
 
-  buildPhase = "jbuilder build -p ocp-index";
+  buildPhase = "dune build -p ocp-index";
 
-  inherit (jbuilder) installPhase;
+  inherit (dune) installPhase;
 
   meta = {
     homepage = http://typerex.ocamlpro.com/ocp-index.html;
diff --git a/pkgs/development/tools/ocaml/utop/default.nix b/pkgs/development/tools/ocaml/utop/default.nix
index 1341e071842b..434f8b3af2ea 100644
--- a/pkgs/development/tools/ocaml/utop/default.nix
+++ b/pkgs/development/tools/ocaml/utop/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, ocaml, findlib, ocamlbuild, jbuilder
+{ stdenv, fetchurl, ocaml, findlib, ocamlbuild, dune
 , lambdaTerm, cppo, makeWrapper
 }:
 
@@ -16,11 +16,11 @@ stdenv.mkDerivation rec {
   };
 
   nativeBuildInputs = [ makeWrapper ];
-  buildInputs = [ ocaml findlib ocamlbuild cppo jbuilder ];
+  buildInputs = [ ocaml findlib ocamlbuild cppo dune ];
 
   propagatedBuildInputs = [ lambdaTerm ];
 
-  inherit (jbuilder) installPhase;
+  inherit (dune) installPhase;
 
   postFixup =
    let
diff --git a/pkgs/development/tools/pyre/default.nix b/pkgs/development/tools/pyre/default.nix
index b51f6344c9b7..c466d39eb4e1 100644
--- a/pkgs/development/tools/pyre/default.nix
+++ b/pkgs/development/tools/pyre/default.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchFromGitHub, ocamlPackages, makeWrapper, writeScript
-, jbuilder, python3, rsync, fetchpatch }:
+, dune, python3, rsync, fetchpatch }:
 let
   # Manually set version - the setup script requires
   # hg and git + keeping the .git directory around.
@@ -39,7 +39,7 @@ let
     ppx_deriving_yojson
     ocamlbuild
     ppxlib
-    jbuilder
+    dune
     ounit
     # python36Packages.python36Full # TODO
   ];
diff --git a/pkgs/top-level/aliases.nix b/pkgs/top-level/aliases.nix
index 441a8f8dcfb2..b8298b76d778 100644
--- a/pkgs/top-level/aliases.nix
+++ b/pkgs/top-level/aliases.nix
@@ -131,6 +131,7 @@ mapAliases ({
   iana_etc = iana-etc;  # added 2017-03-08
   idea = jetbrains; # added 2017-04-03
   inotifyTools = inotify-tools;
+  jbuilder = dune; # added 2018-09-09
   joseki = apache-jena-fuseki; # added 2016-02-28
   json_glib = json-glib; # added 2018-02-25
   kdiff3-qt5 = kdiff3; # added 2017-02-18
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 0c0e485357c8..9722e945594e 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -1243,6 +1243,8 @@ with pkgs;
 
   dtrx = callPackage ../tools/compression/dtrx { };
 
+  dune = callPackage ../development/tools/ocaml/dune { };
+
   duperemove = callPackage ../tools/filesystems/duperemove { };
 
   dylibbundler = callPackage ../tools/misc/dylibbundler { };
@@ -1403,8 +1405,6 @@ with pkgs;
 
   interlock = callPackage ../servers/interlock {};
 
-  jbuilder = callPackage ../development/tools/ocaml/jbuilder { };
-
   kapacitor = callPackage ../servers/monitoring/kapacitor { };
 
   kisslicer = callPackage ../tools/misc/kisslicer { };