diff --git a/pkgs/games/gmad/default.nix b/pkgs/games/gmad/default.nix
new file mode 100644
index 00000000000..a15914877cc
--- /dev/null
+++ b/pkgs/games/gmad/default.nix
@@ -0,0 +1,34 @@
+{ stdenv, fetchFromGitHub, premake4, bootil }:
+
+stdenv.mkDerivation rec {
+  name = "gmad-unstable-2015-04-16";
+
+  meta = {
+    description = "Garry's Mod Addon Creator and Extractor";
+    homepage = https://github.com/garrynewman/gmad;
+    license = stdenv.lib.licenses.unfree;
+    maintainers = [ stdenv.lib.maintainers.abigailbuccaneer ];
+    platforms = stdenv.lib.platforms.all;
+  };
+
+  src = fetchFromGitHub {
+    owner = "garrynewman";
+    repo = "gmad";
+    rev = "377f3458bf1ecb8a1a2217c2194773e3c2a2dea0";
+    sha256="0myi9njr100gxhxk1vrzr2sbij5kxl959sq0riiqgg01div338g0";
+  };
+
+  buildInputs = [ premake4 bootil ];
+
+  targetName =
+    if stdenv.isLinux then "gmad_linux"
+    else if stdenv.isDarwin then "gmad_osx"
+    else "gmad";
+
+  configurePhase = "premake4 --bootil_lib=${bootil}/lib --bootil_inc=${bootil}/include gmake";
+
+  installPhase = ''
+    mkdir -p $out/bin
+    cp ${targetName} $out/bin/gmad
+  '';
+}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 348e2928d1d..5e19d35d3cd 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -15542,6 +15542,8 @@ in
 
   gltron = callPackage ../games/gltron { };
 
+  gmad = callPackage ../games/gmad { };
+
   gnubg = callPackage ../games/gnubg { };
 
   gnuchess = callPackage ../games/gnuchess { };