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-rw-r--r--pkgs/development/ruby-modules/gem-config/default.nix10
1 files changed, 9 insertions, 1 deletions
diff --git a/pkgs/development/ruby-modules/gem-config/default.nix b/pkgs/development/ruby-modules/gem-config/default.nix
index 8640d43775dc..01644080b40c 100644
--- a/pkgs/development/ruby-modules/gem-config/default.nix
+++ b/pkgs/development/ruby-modules/gem-config/default.nix
@@ -22,7 +22,7 @@
 , pkgconfig , ncurses, xapian_1_2_22, gpgme, utillinux, fetchpatch, tzdata, icu, libffi
 , cmake, libssh2, openssl, mysql, darwin, git, perl, pcre, gecode_3, curl
 , msgpack, qt48, libsodium, snappy, libossp_uuid, lxc, libpcap, xorg, gtk2, buildRubyGem
-, cairo, re2, rake, gobjectIntrospection, gdk_pixbuf, zeromq, graphicsmagick, libcxx
+, cairo, re2, rake, gobjectIntrospection, gdk_pixbuf, zeromq, graphicsmagick, libcxx, file
 }@args:
 
 let
@@ -218,6 +218,14 @@ in
     ];
   };
 
+  magic = attrs: {
+    buildInputs = [ file ];
+    postInstall = ''
+      installPath=$(cat $out/nix-support/gem-meta/install-path)
+      sed -e 's@ENV\["MAGIC_LIB"\] ||@ENV\["MAGIC_LIB"\] || "${file}/lib/libmagic.so" ||@' -i $installPath/lib/magic/api.rb
+    '';
+  };
+
   msgpack = attrs: {
     buildInputs = [ msgpack ];
   };