Use MPIEXEC_EXECUTABLE

repos/vae/packages/molflow/package.py

@@ -24,7 +24,8 @@ class Molflow(CMakePackage):
                 self.define('NO_INTERFACE', True)
                 ]
         if self.spec.satisfies('@2.9.4_beta'):
-            args.append( self.define('MPI_HOME', self.spec['openmpi'].prefix) )
+            args.append( self.define('MPIEXEC_EXECUTABLE',
+                '{0}/bin/mpiexec'.format(self.spec['openmpi'].prefix)) )
         return args
 
     def install(self, spec, prefix):