diff --git a/pkgs/development/compilers/mozart/binary.nix b/pkgs/development/compilers/mozart/binary.nix
index 1c3a21e2e449..d802aa4fe2e7 100644
--- a/pkgs/development/compilers/mozart/binary.nix
+++ b/pkgs/development/compilers/mozart/binary.nix
@@ -1,25 +1,30 @@
-{ stdenv, fetchurl, boost, emacs, gmp, makeWrapper
+{ stdenv, fetchurl, makeWrapper
+, boost, gmp
 , tcl-8_5, tk-8_5
+, emacs
 }:
 
 let
-
   version = "2.0.0";
 
-in stdenv.mkDerivation {
+  binaries = {
+    "x86_64-linux" = fetchurl {
+      url = "mirror://sourceforge/project/mozart-oz/v${version}-alpha.0/mozart2-${version}-alpha.0+build.4105.5c06ced-x86_64-linux.tar.gz";
+      sha256 = "0rsfrjimjxqbwprpzzlmydl3z3aiwg5qkb052jixdxjyad7gyh5z";
+    };
+  };
+in
+
+stdenv.mkDerivation {
   name = "mozart-binary-${version}";
 
   preferLocalBuild = true;
 
-  src = fetchurl {
-    url = "mirror://sourceforge/project/mozart-oz/v${version}-alpha.0/mozart2-${version}-alpha.0+build.4105.5c06ced-x86_64-linux.tar.gz";
-    sha256 = "0rsfrjimjxqbwprpzzlmydl3z3aiwg5qkb052jixdxjyad7gyh5z";
-  };
+  src = binaries."${stdenv.system}" or (throw "unsupported system: ${stdenv.system}");
 
   libPath = stdenv.lib.makeLibraryPath
     [ stdenv.cc.cc
       boost
-      emacs
       gmp
       tcl-8_5
       tk-8_5
@@ -27,10 +32,36 @@ in stdenv.mkDerivation {
 
   TK_LIBRARY = "${tk-8_5}/lib/tk8.5";
 
-  builder = ./builder.sh;
-
   buildInputs = [ makeWrapper ];
 
+  buildCommand = ''
+    mkdir $out
+    tar xvf $src -C $out --strip-components=1
+
+    for exe in $out/bin/{ozemulator,ozwish} ; do
+      patchelf --set-interpreter $(< $NIX_CC/nix-support/dynamic-linker) \
+               --set-rpath $libPath \
+               $exe
+    done
+
+    wrapProgram $out/bin/ozwish \
+      --set OZHOME $out \
+      --set TK_LIBRARY $TK_LIBRARY
+
+    wrapProgram $out/bin/ozemulator --set OZHOME $out
+
+    ${stdenv.lib.optionalString (emacs != null) ''
+      wrapProgram $out/bin/oz --suffix PATH ":" ${stdenv.lib.makeBinPath [ emacs ]}
+    ''}
+
+    sed -i $out/share/applications/oz.desktop \
+        -e "s,Exec=oz %u,Exec=$out/bin/oz %u,"
+
+    gzip -9n $out/share/mozart/elisp"/"*.elc
+
+    patchShebangs $out
+  '';
+
   meta = with stdenv.lib; {
     homepage = "http://www.mozart-oz.org/";
     description = "Multiplatform implementation of the Oz programming language";
@@ -42,6 +73,7 @@ in stdenv.mkDerivation {
       expressive power and advanced functionality.
     '';
     license = licenses.mit;
-    platforms = [ "x86_64-linux" ];
+    platforms = attrNames binaries;
+    hydraPlatforms = [];
   };
 }
diff --git a/pkgs/development/compilers/mozart/builder.sh b/pkgs/development/compilers/mozart/builder.sh
deleted file mode 100644
index b606d4c1bde9..000000000000
--- a/pkgs/development/compilers/mozart/builder.sh
+++ /dev/null
@@ -1,26 +0,0 @@
-source $stdenv/setup
-
-echo "unpacking $src..."
-tar xvfz $src
-
-mkdir -p $out/bin
-mkdir -p $out/share
-
-mv mozart*linux/bin/* $out/bin
-mv mozart*linux/share/* $out/share
-
-patchShebangs $out
-
-for f in $out/bin/*; do
-    b=$(basename $f)
-
-    if [ $b == "ozemulator" ] || [ $b == "ozwish" ]; then
-        patchelf --interpreter "$(cat $NIX_CC/nix-support/dynamic-linker)" \
-                 --set-rpath $libPath \
-                 $f
-        continue;
-    fi
-
-    wrapProgram $f --set OZHOME $out \
-                   --set TK_LIBRARY $TK_LIBRARY
-done