mpich2: use gfortran 5

rbvermaa · rbvermaa · commit 2c056b1f283c · 2017-09-10T14:14:53.000Z
(cherry picked from commit 7f47214)
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
@@ -9689,7 +9689,9 @@ with pkgs;
 
   libmpc = callPackage ../development/libraries/libmpc { };
 
-  mpich2 = callPackage ../development/libraries/mpich2 { };
+  mpich2 = callPackage ../development/libraries/mpich2 {
+    gfortran = gfortran5;
+  };
 
   mstpd = callPackage ../os-specific/linux/mstpd { };
 
