fixed for ld on osx

cluster_configs/local-osx.cmake

@@ -31,9 +31,9 @@ if ( COMPILER STREQUAL "gnu")
         set(CMAKE_CXX_COMPILER     g++      CACHE STRING "CXX compiler"     FORCE) # C++ compiler for serial build
         set(CMAKE_Fortran_COMPILER gfortran    CACHE STRING "Fortran compiler" FORCE) # Fortran compiler for serial build
     else()
-        set(CMAKE_C_COMPILER       mpicc  CACHE STRING "C compiler"       FORCE) # C compiler for parallel build
-        set(CMAKE_CXX_COMPILER     mpicxx CACHE STRING "CXX compiler"     FORCE) # C++ compiler for parallel build
-        set(CMAKE_Fortran_COMPILER mpifort CACHE STRING "Fortran compiler" FORCE) # Fortran compiler for parallel build
+        set(CMAKE_C_COMPILER       gcc  CACHE STRING "C compiler"       FORCE) # C compiler for parallel build
+        set(CMAKE_CXX_COMPILER     g++ CACHE STRING "CXX compiler"     FORCE) # C++ compiler for parallel build
+        set(CMAKE_Fortran_COMPILER gfortran CACHE STRING "Fortran compiler" FORCE) # Fortran compiler for parallel build
     endif()
     set(comp_flags -O3 -fno-strict-aliasing -funroll-loops -march=native -std=c++0x CACHE  STRING  "comp_flags to add" FORCE)
 endif()