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libpng12/cross: Don't add zlib for Darwin builds.

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Cross builds for Darwin already include the CoreFoundation and the
libraries from XCode, so zlib already exists on that platform.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>
This commit is contained in:
aszlig 2014-03-12 06:34:42 +01:00
parent f73851710e
commit cdaced58ae
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1 changed files with 6 additions and 1 deletions
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7
pkgs/development/libraries/libpng/12.nix
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@ -1,6 +1,6 @@
{ stdenv, fetchurl, zlib, xz }:
assert zlib != null;
assert !(stdenv ? cross) -> zlib != null;
stdenv.mkDerivation rec {
name = "libpng-1.2.50";
@ -16,6 +16,11 @@ stdenv.mkDerivation rec {
passthru = { inherit zlib; };
crossAttrs = stdenv.lib.optionalAttrs (stdenv.cross.libc == "libSystem") {
propagatedBuildInputs = [];
passthru = {};
};
meta = {
description = "The official reference implementation for the PNG file format";
homepage = http://www.libpng.org/pub/png/libpng.html;