From 3026d8833daf8bfe7d5c0f7cea2453ebb8fc8dbb Mon Sep 17 00:00:00 2001
From: Joel Taylor <me@joelt.io>
Date: Thu, 7 Aug 2014 18:46:17 -0700
Subject: [PATCH] add libs to GEM_PATH

---
 pkgs/development/interpreters/ruby/gem.nix | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/pkgs/development/interpreters/ruby/gem.nix b/pkgs/development/interpreters/ruby/gem.nix
index d8173de2ecc6..c7256954a151 100644
--- a/pkgs/development/interpreters/ruby/gem.nix
+++ b/pkgs/development/interpreters/ruby/gem.nix
@@ -82,6 +82,12 @@ in ruby.stdenv.mkDerivation (attrs // {
     rm $out/${ruby.gemPath}/doc/*/*/created.rid || true
     rm $out/${ruby.gemPath}/gems/*/ext/*/mkmf.log || true
 
+    mkdir -p $out/nix-support
+
+    cat > $out/nix-support/setup-hook <<EOF
+    addToSearchPath GEM_PATH $out/${ruby.gemPath}
+    EOF
+
     runHook postInstall
   '';