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-rw-r--r--pkgs/development/interpreters/ruby/gem.nix4
1 files changed, 4 insertions, 0 deletions
diff --git a/pkgs/development/interpreters/ruby/gem.nix b/pkgs/development/interpreters/ruby/gem.nix
index b4ddd26bb46b..22801aa5b044 100644
--- a/pkgs/development/interpreters/ruby/gem.nix
+++ b/pkgs/development/interpreters/ruby/gem.nix
@@ -39,6 +39,10 @@ let
         [[ -e "$out/bin/$(basename $prog)" ]]
       done
 
+      # looks like useless files which break build repeatability and consume space
+      rm $out/${ruby.gemPath}/doc/*/*/created.rid || true
+      rm $out/${ruby.gemPath}/gems/*/ext/*/mkmf.log || true
+
       runHook postInstall
     '';