If you see an error like this when you run make, it means make is attempting to execute a directory, not a program. Which means you probably have extra spacing in one of your variables in your config/make files.

make[1]: execvp: /usr/mpi/intel/mvapich: Permission denied

Run the command:

 make -n 

which will print the commands that would be executed, but does not execute them. This will help you diagnose make file problems, and, if it still doesn't work, you can attach the output to a support request.