Add eternity engine, a Doom port by James Haley

Eternity Engine is a limit removing port descended from BOOM

pkgs/games/eternity-engine/default.nix

@@ -0,0 +1,29 @@
+{ stdenv, cmake, mesa, SDL, SDL_mixer, SDL_net, fetchurl }:
+
+stdenv.mkDerivation rec {
+  name = "eternity-engine-3.40.46";
+  src = fetchurl {
+    url = https://github.com/team-eternity/eternity/archive/3.40.46.tar.gz;
+    sha256 = "0jq8q0agw7lgab9q2h8wcaakvg913l9j3a6ss0hn9661plkw2yb4";
+  };
+
+  cmakeFlags = ''
+    -DCMAKE_BUILD_TYPE=Release
+  '';
+
+  buildInputs = [ stdenv cmake mesa SDL SDL_mixer SDL_net ];
+
+  enableParallelBuilding = true;
+
+  installPhase = ''
+  mkdir -p $out/bin
+  cp source/eternity $out/bin
+  '';
+
+  meta = {
+    homepage = http://doomworld.com/eternity;
+    description = "New school Doom port by James Haley";
+    license = stdenv.lib.licenses.gpl3;
+    maintainers = with stdenv.lib.maintainers; [ MP2E ];
+  };
+}

pkgs/games/eternity-engine/master.nix

@@ -0,0 +1,30 @@
+{ stdenv, cmake, mesa, SDL, SDL_mixer, SDL_net, fetchgit }:
+
+stdenv.mkDerivation rec {
+  name = "eternity-engine-20140902";
+  src = fetchgit {
+    url = git://github.com/team-eternity/eternity.git;
+    rev = "db21379abb33f6d92dc0e1665e527e4d49acc722";
+    sha256 = "0k54yvxqxnd60az21b734ka3myxkqb7pjmdp3klrkfwp1kl02ysc";
+  };
+
+  cmakeFlags = ''
+    -DCMAKE_BUILD_TYPE=Release
+  '';
+
+  buildInputs = [ stdenv cmake mesa SDL SDL_mixer SDL_net ];
+
+  enableParallelBuilding = true;
+
+  installPhase = ''
+  mkdir -p $out/bin
+  cp source/eternity $out/bin
+  '';
+
+  meta = {
+    homepage = http://doomworld.com/eternity;
+    description = "New school Doom port by James Haley";
+    license = stdenv.lib.licenses.gpl3;
+    maintainers = with stdenv.lib.maintainers; [ MP2E ];
+  };
+}

pkgs/top-level/all-packages.nix

@@ -993,6 +993,9 @@ let
 
   ethtool = callPackage ../tools/misc/ethtool { };
 
+  eternity = callPackage ../games/eternity-engine { };
+  eternityMaster = callPackage ../games/eternity-engine/master.nix { };
+
   ettercap = callPackage ../applications/networking/sniffers/ettercap { };
 
   euca2ools = callPackage ../tools/virtualization/euca2ools { pythonPackages = python26Packages; };