1 files changed, 4 insertions, 2 deletions
diff --git a/nixpkgs/pkgs/applications/science/electronics/kicad/libraries.nix b/nixpkgs/pkgs/applications/science/electronics/kicad/libraries.nix
index 4dde2a0a122..91ce30de5f0 100644
--- a/nixpkgs/pkgs/applications/science/electronics/kicad/libraries.nix
+++ b/nixpkgs/pkgs/applications/science/electronics/kicad/libraries.nix
@@ -15,7 +15,9 @@ let
   mkLib = name:
     stdenv.mkDerivation {
       pname = "kicad-${name}";
-      version = "${version}";
+      # Use the revision instead of `version` (which is an ISO 8601 date)
+      # to prevent duplicating the library when just the date changed
+      version = "${builtins.substring 0 10 libSources.${name}.rev}";
       src = fetchFromGitHub (
         {
           owner = "KiCad";
@@ -50,7 +52,7 @@ in
   i18n = let name = "i18n"; in
     stdenv.mkDerivation {
       pname = "kicad-${name}";
-      version = "${version}";
+      version = "${builtins.substring 0 10 libSources.${name}.rev}";
       src = fetchFromGitLab (
         {
           group = "kicad";