diff --git a/pkgs/top-level/python-aliases.nix b/pkgs/top-level/python-aliases.nix
index 124a9533dccd..887ae8a149a2 100644
--- a/pkgs/top-level/python-aliases.nix
+++ b/pkgs/top-level/python-aliases.nix
@@ -38,6 +38,7 @@ mapAliases ({
   dateutil = python-dateutil; # added 2021-07-03
   detox = throw "detox is no longer maintained, and was broken since may 2019"; # added 2020-07-04
   diff_cover = diff-cover; # added 2021-07-02
+  dftfit = throw "it's dependency lammps-cython no longer builds";
   dns = dnspython; # Alias for compatibility, 2017-12-10
   faulthandler = throw "faulthandler is built into ${python.executable}";
   gitdb2 = throw "gitdb2 has been deprecated, use gitdb instead."; # added 2020-03-14
@@ -45,6 +46,7 @@ mapAliases ({
   google_api_python_client = google-api-python-client; # added 2021-03-19
   googleapis_common_protos = googleapis-common-protos; # added 2021-03-19
   HAP-python = hap-python; # added 2021-06-01
+  lammps-cython = throw "no longer builds and is unmaintained";
   MechanicalSoup = mechanicalsoup; # added 2021-06-01
   privacyidea = throw "renamed to pkgs.privacyidea"; # added 2021-06-20
   pylibgen = throw "pylibgen is unmaintained upstreamed, and removed from nixpkgs"; # added 2020-06-20