From bddf342631ce417dac99f6f222075c51cf4109de Mon Sep 17 00:00:00 2001
From: Peter Simons <simons@cryp.to>
Date: Wed, 22 Oct 2014 00:23:12 +0200
Subject: [PATCH] Patch 7a20d76 failed when the Haskell expression lacked a
 meta attribute. This commit fixes that issue.

---
 pkgs/build-support/cabal/default.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/build-support/cabal/default.nix b/pkgs/build-support/cabal/default.nix
index 2b06adf3490c..3fa833876921 100644
--- a/pkgs/build-support/cabal/default.nix
+++ b/pkgs/build-support/cabal/default.nix
@@ -58,7 +58,7 @@ assert !enableStaticLibraries -> versionOlder "7.7" ghc.version;
                 doCheck               = enableCheckPhase && x.doCheck;
                 hyperlinkSource       = enableHyperlinkSource && x.hyperlinkSource;
                 # Disable Darwin builds: <https://github.com/NixOS/nixpkgs/issues/2689>.
-                meta                  = let meta = x.meta;
+                meta                  = let meta = x.meta or {};
                                             hydraPlatforms = meta.hydraPlatforms or meta.platforms or [];
                                             noElem         = p: ps: !stdenv.lib.elem p ps;
                                             noDarwin       = p: noElem p stdenv.lib.platforms.darwin;