Attempt at compiling MilkyTracker, but recent zlib version may have broken it.

There's a zlib version included with milkytracker,
but there's no makefiles for it. I've only included
the header here, but it fails at link-time with
several 'undefined reference' errors, which simply
means it can't find the definitions, e.g. compiled
zlib.
There's bug reports on other package systems although
unfortunately still unresolved.
https://bugs.archlinux.org/task/31324
http://lists.freebsd.org/pipermail/freebsd-ports/2013-March/082180.html

pkgs/applications/audio/milkytracker/default.nix

@@ -0,0 +1,49 @@
+{ stdenv, fetchurl, alsaLib, SDL, automake, autoconf, perl}:
+
+stdenv.mkDerivation rec {
+  version = "0.90.85";
+  name = "milkytracker-${version}";
+
+  src = fetchurl {
+    url = "http://milkytracker.org/files/milkytracker-0.90.85.tar.gz";
+    sha256 = "184pk0k9nv461a61sh6lb62wfadjwwk8ri3z5kpdbqnyssz0zfpv";
+  };
+
+  # Get two official patches.
+  no_zzip_patch = fetchurl {
+    url = "http://www.milkytracker.org/files/patches-0.90.85/no_zziplib_dep.patch";
+    sha256 = "1w550q7pxa7w6v2v19ljk03hayacrs6y887izg11a1983wk7qzb3";
+      };
+
+  fix_64bit_patch = fetchurl {
+    url = "http://www.milkytracker.org/files/patches-0.90.85/64bit_freebsd_fix.patch";
+    sha256 = "0gwd4zslbd8kih80k4v7n2c65kvm2cq3kl6d7y33z1l007vzyvf6";
+  };
+
+  preConfigure = ''
+   patch ./src/tracker/sdl/SDL_Main.cpp < ${fix_64bit_patch}
+   patch < ${no_zzip_patch}
+  '';
+
+  # There's a zlib version included with milkytracker,
+  # but there's no makefiles for it. I've only included
+  # the header here, but it fails at link-time with
+  # several 'undefined reference' errors, which simply
+  # means it can't find the definitions, e.g. compiled
+  # zlib.
+  # There's bug reports on other package systems although
+  # unfortunately still unresolved.
+  # https://bugs.archlinux.org/task/31324
+  # http://lists.freebsd.org/pipermail/freebsd-ports/2013-March/082180.html
+  preBuild=''
+    export CPATH="`pwd`/src/compression/zlib/generic"
+  '';
+
+  buildInputs = [ alsaLib SDL automake autoconf perl];
+
+  meta = {
+    description = "Music tracker application, similar to Fasttracker II.";
+    homepage = http://milkytracker.org;
+    license = "GPLv3";
+  };
+}

pkgs/top-level/all-packages.nix

@@ -7358,6 +7358,8 @@ let
 
   audacity = callPackage ../applications/audio/audacity { };
 
+  milkytracker = callPackage ../applications/audio/milkytracker { };
+
   aumix = callPackage ../applications/audio/aumix {
     gtkGUI = false;
   };