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-rw-r--r--pkgs/development/ruby-modules/gem-config/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/ruby-modules/gem-config/default.nix b/pkgs/development/ruby-modules/gem-config/default.nix
index 1349a4a53ac..64cacc976f4 100644
--- a/pkgs/development/ruby-modules/gem-config/default.nix
+++ b/pkgs/development/ruby-modules/gem-config/default.nix
@@ -90,7 +90,7 @@ in
   nokogiri = attrs: {
     buildFlags = [
       "--use-system-libraries"
-      "--with-zlib-dir=${zlib}"
+      "--with-zlib-dir=${zlib.dev}"
       "--with-xml2-lib=${libxml2.out}/lib"
       "--with-xml2-include=${libxml2.dev}/include/libxml2"
       "--with-xslt-lib=${libxslt.out}/lib"