<commit_before>{ stdenv, fetchurl, zlib }:

assert zlib != null;

stdenv.mkDerivation rec {
  name = "libpng-1.2.44";
  
  src = fetchurl {
    url = "mirror://sourceforge/libpng/${name}.tar.gz";
    md5 = "89b62f8daaeeab1342e307d6d1411ff1";
  };
  
  propagatedBuildInputs = [ zlib ];

  passthru = { inherit zlib; };
  
  meta = {
    description = "The official reference implementation for the PNG file format";
    homepage = http://www.libpng.org/pub/png/libpng.html;
    license = "free-non-copyleft"; # http://www.libpng.org/pub/png/src/libpng-LICENSE.txt
  };
}<commit_msg>libpng-1.2.46<commit_after>{ stdenv, fetchurl, zlib, xz }:

assert zlib != null;

stdenv.mkDerivation rec {
  name = "libpng-1.2.46";
  
  src = fetchurl {
    url = "mirror://sourceforge/libpng/${name}.tar.gz";
    sha256 = "0rcx4v4khdkrvz7b02fmx7lab2pk1lal4dhx9widv36b7g2xvwzn";
  };
  
  propagatedBuildInputs = [ zlib ];

  buildNativeInputs = [ xz ];

  passthru = { inherit zlib; };
  
  meta = {
    description = "The official reference implementation for the PNG file format";
    homepage = http://www.libpng.org/pub/png/libpng.html;
    license = "free-non-copyleft"; # http://www.libpng.org/pub/png/src/libpng-LICENSE.txt
  };
}
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