Integrated improvements from PR #893 to remove hardcoded MPI path.

var/spack/repos/builtin/packages/scotch/package.py

@@ -103,7 +103,7 @@ def configure(self):
 
         makefile_inc.append('CCS       = $(CC)')
         makefile_inc.append('CCP       = %s' %
-            (os.path.join(self.spec['mpi'].prefix.bin, 'mpicc') if '+mpi' in self.spec else 'mpicc'))
+            (self.spec['mpi'].mpicc if '+mpi' in self.spec else 'mpicc'))
         makefile_inc.append('CCD       = $(CCS)')
 
         ## Extra Features ##