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-rw-r--r--pkgs/development/ruby-modules/gem/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/ruby-modules/gem/default.nix b/pkgs/development/ruby-modules/gem/default.nix
index 7105663413a2..d57eeb2ea055 100644
--- a/pkgs/development/ruby-modules/gem/default.nix
+++ b/pkgs/development/ruby-modules/gem/default.nix
@@ -224,7 +224,7 @@ stdenv.mkDerivation ((builtins.removeAttrs attrs ["source"]) // {
pushd $out/${ruby.gemPath}
find doc/ -iname created.rid -delete -print
find gems/*/ext/ extensions/ \( -iname Makefile -o -iname mkmf.log -o -iname gem_make.out \) -delete -print
- ${if keepGemCache then "" else "rm -fvr cache"}
+ ${lib.optionalString (!keepGemCache) "rm -fvr cache"}
popd
# write out metadata and binstubs