[Nix-dev] darwin haskellPackages.gtk

[Peter Simons]

Hi Patrick,

 > I replaced:
 >     ++ stdenv.lib.optionals cupsSupport [ cups ];
 > with
 >     ++ (if stdenv.isDarwin then stdenv.lib.optionals cupsSupport [ cups ] else []);

CUPS is developed by *Apple* -- that package should compile just fine on
Darwin. I reckon the problem was that CUPS had Linux-specific
dependencies such as 'acl'. I fixed the CUPS expression accordingly.
Could you please try again whether building GTK+ now succeeds?

Take care,
Peter