hdf5: Add mpi support

Optionally, build the parallel version of hdf5.

pkgs/tools/misc/hdf5/default.nix

@@ -3,6 +3,7 @@
 , fetchurl
 , zlib ? null
 , szip ? null
+, mpi ? null
 }:
 stdenv.mkDerivation rec {
   version = "1.8.13";
@@ -12,11 +13,22 @@ stdenv.mkDerivation rec {
     sha256 = "1h9qdl321gzm3ihdhlijbl9sh9qcdrw94j7izg64yfqhxj7b7xl2";  			
   };
 
+  passthru = {
+    mpiSupport = (mpi != null);
+    inherit mpi;
+  };
+
   buildInputs = []
     ++ stdenv.lib.optional (zlib != null) zlib
     ++ stdenv.lib.optional (szip != null) szip;
 
-  configureFlags = if szip != null then "--with-szlib=${szip}" else "";
+  propagatedBuildInputs = []
+    ++ stdenv.lib.optional (mpi != null) mpi;
+
+  configureFlags = "
+    ${if szip != null then "--with-szlib=${szip}" else ""}
+    ${if mpi != null then "--enable-parallel" else ""}
+  ";
   
   patches = [./bin-mv.patch];