ginac: 1.6.2 -> 1.7.2

pkgs/applications/science/math/ginac/default.nix

···
-{ stdenv, fetchurl, cln, pkgconfig, readline, gmp }:
+{ stdenv, fetchurl, cln, pkgconfig, readline, gmp, python }:
 
 stdenv.mkDerivation rec {
-  name = "ginac-1.6.2";
+  name = "ginac-1.7.2";
 
   src = fetchurl {
     url    = "${meta.homepage}/${name}.tar.bz2";
-    sha256 = "1pivcqqaf142l6vrj2azq6dxrcyzhag4za2dwicb4gsb09ax4d0g";
+    sha256 = "1dyq47gc97jn1r5sy0klxs5b4lzhckyjqgsvwcs2a9ybqmhmpdr4";
   };
 
   propagatedBuildInputs = [ cln ];
 
   buildInputs = [ readline ] ++ stdenv.lib.optional stdenv.isDarwin gmp;
 
-  nativeBuildInputs = [ pkgconfig ];
+  nativeBuildInputs = [ pkgconfig python ];
+
+  preConfigure = "patchShebangs ginsh";
 
   configureFlags = "--disable-rpath";