Simplify paths

garlic/ppong/default.nix

@@ -0,0 +1,34 @@
+{
+  stdenv
+, mpi
+, fetchurl
+}:
+
+stdenv.mkDerivation {
+  name = "ppong";
+
+  src = fetchurl {
+    url = "http://www.csl.mtu.edu/cs4331/common/PPong.c";
+    sha256 = "0d1w72gq9627448cb7ykknhgp2wszwd117dlbalbrpf7d0la8yc0";
+  };
+
+  unpackCmd = ''
+    mkdir src
+    cp $src src/ppong.c
+  '';
+
+  dontConfigure = true;
+
+  buildPhase = ''
+    echo mpicc -include stdlib.h ppong.c -o ppong
+    mpicc -include stdlib.h ppong.c -o ppong
+  '';
+
+  installPhase = ''
+    mkdir -p $out/bin
+    cp ppong $out/bin/ppong
+    ln -s $out/bin/ppong $out/bin/run
+  '';
+
+  buildInputs = [ mpi ];
+}