Hi, Just trying to build MPICH 3.1rc2 on a Mac. The build seems to work but fails while trying to compile the examples. This is using the intel compilers. ifort,icc version 14.0.0.074 Here is the config line. ./configure CC=icc CXX=icpc F77=ifort FC=ifort --enable-fc error message. make[4]: Nothing to be done for `all'. make[4]: Nothing to be done for `all-am'. Making all in . Making all in . Making all in examples CCLD cpi Undefined symbols for architecture x86_64: "_MPI_Bcast", referenced from: _main in cpi.o "_MPI_Comm_rank", referenced from: _main in cpi.o "_MPI_Comm_size", referenced from: _main in cpi.o "_MPI_Finalize", referenced from: _main in cpi.o "_MPI_Get_processor_name", referenced from: _main in cpi.o "_MPI_Init", referenced from: _main in cpi.o "_MPI_Reduce", referenced from: _main in cpi.o "_MPI_Wtime", referenced from: _main in cpi.o ld: symbol(s) not found for architecture x86_64 make[2]: *** [cpi] Error 1 make[1]: *** [all-recursive] Error 1 make: *** [all] Error 2 Thank you. Rene