diff --git a/pkgs/development/ocaml-modules/bap/default.nix b/pkgs/development/ocaml-modules/bap/default.nix
index 6723ad0c1c81..f8e07fd1265c 100644
--- a/pkgs/development/ocaml-modules/bap/default.nix
+++ b/pkgs/development/ocaml-modules/bap/default.nix
@@ -49,6 +49,7 @@ stdenv.mkDerivation rec {
                             piqi-ocaml uuidm frontc yojson ];
 
   installPhase = ''
+    runHook preInstall
     export OCAMLPATH=$OCAMLPATH:$OCAMLFIND_DESTDIR;
     export PATH=$PATH:$out/bin
     export CAML_LD_LIBRARY_PATH=''${CAML_LD_LIBRARY_PATH-}''${CAML_LD_LIBRARY_PATH:+:}$OCAMLFIND_DESTDIR/bap-plugin-llvm/:$OCAMLFIND_DESTDIR/bap/
@@ -58,6 +59,7 @@ stdenv.mkDerivation rec {
     makeWrapper ${utop}/bin/utop $out/bin/baptop --prefix OCAMLPATH : $OCAMLPATH --prefix PATH : $PATH --add-flags "-ppx ppx-bap -short-paths -require \"bap.top\""
     wrapProgram $out/bin/bapbuild --prefix OCAMLPATH : $OCAMLPATH --prefix PATH : $PATH
     ln -s $sigs $out/share/bap/sigs.zip
+    runHook postInstall
   '';
 
   disableIda = "--disable-ida";
diff --git a/pkgs/development/ocaml-modules/piqi-ocaml/default.nix b/pkgs/development/ocaml-modules/piqi-ocaml/default.nix
index 9899bfc4bdf9..590c001c4195 100644
--- a/pkgs/development/ocaml-modules/piqi-ocaml/default.nix
+++ b/pkgs/development/ocaml-modules/piqi-ocaml/default.nix
@@ -16,7 +16,11 @@ stdenv.mkDerivation rec {
 
   createFindlibDestdir = true;
 
-  installPhase = "DESTDIR=$out make install";
+  installPhase = ''
+    runHook preInstall
+    DESTDIR=$out make install
+    runHook postInstall
+  '';
 
   meta = with lib; {
     homepage = "https://piqi.org";
diff --git a/pkgs/development/ocaml-modules/piqi/default.nix b/pkgs/development/ocaml-modules/piqi/default.nix
index 84ccc469f6e5..faeb804d8aa8 100644
--- a/pkgs/development/ocaml-modules/piqi/default.nix
+++ b/pkgs/development/ocaml-modules/piqi/default.nix
@@ -19,15 +19,9 @@ stdenv.mkDerivation rec {
 
   createFindlibDestdir = true;
 
-  buildPhase = ''
-    make
-    make -C piqilib piqilib.cma
-  '';
+  postBuild = "make -C piqilib piqilib.cma";
 
-  installPhase = ''
-    make install;
-    make ocaml-install;
-  '';
+  installTargets = [ "install" "ocaml-install" ];
 
   meta = with lib; {
     homepage = "https://piqi.org";