diff --git a/pkgs/development/ruby-modules/gem-config/default.nix b/pkgs/development/ruby-modules/gem-config/default.nix
index 21cc80ea6bae..acd04ee3bf5a 100644
--- a/pkgs/development/ruby-modules/gem-config/default.nix
+++ b/pkgs/development/ruby-modules/gem-config/default.nix
@@ -21,7 +21,7 @@
 , libiconv, postgresql, v8_3_16_14, clang, sqlite, zlib, imagemagick
 , pkgconfig , ncurses, xapian, gpgme, utillinux, fetchpatch, tzdata, icu, libffi
 , cmake, libssh2, openssl, mysql, darwin, git, perl, gecode_3, curl
-, libmsgpack, qt48, libsodium, snappy
+, libmsgpack, qt48, libsodium, snappy, libossp_uuid
 }@args:
 
 let
@@ -202,6 +202,10 @@ in
         --replace "/usr/share/zoneinfo" "${tzdata}/share/zoneinfo"
     '';
   };
+  
+  uuid4r = attrs: {
+    buildInputs = [ which libossp_uuid ];
+  };
 
   xapian-ruby = attrs: {
     # use the system xapian