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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 b33758486eed..7ae9168975ab 100644
--- a/pkgs/development/ruby-modules/gem/default.nix
+++ b/pkgs/development/ruby-modules/gem/default.nix
@@ -233,7 +233,7 @@ 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