Jeff: You're correct. That was the incorrect config file. I've attached the correct one as per the recommendations in the help page.   Thanks for your help --- On Thu, 2/19/09, Jeff Squyres <jsquyres@cisco.com> wrote: From: Jeff Squyres <jsquyres@cisco.com> Subject: Re: [OMPI users] ptrdiff_t undefined error on intel 64bit machine with intel compilers To: talmesha_r@yahoo.com, "Open MPI Users" <users@open-mpi.org> Date: Thursday, February 19, 2009, 8:32 AM Your config.log looks incomplete -- it failed saying that your C and C++ compilers were incompatible with each other. This does not seem related to what you described -- are you sure you're sending the right config.log? Specifically, can you send all the information listed here: http://www.open-mpi.org/community/help/ On Feb 17, 2009, at 5:10 PM, Tamara Rogers wrote: > Hello all: > I was unable to compile the latest version (1.3) on my intel 64bit system with the intel compilers (version 9.0). Configuration goes fine, but I get this error when running make: > > ../../ompi/include/mpi.h(203): error: identifier "ptrdiff_t" is undefined > typedef OMPI_PTRDIFF_TYPE MPI_Aint; > > compilation aborted for dt_args.c (cod 21) > > My config line was: > ./configure CC=icc CXX=icpc F77=ifort FC=ifort --prefix=xxx > > I've attached my config.log file. Has anyone encourtered this? I was able to build openmpi on this exact system using the gcc/g++ compilers, however the intel compilers are substantially faster on our system. > > Thanks! > > <config.log>_______________________________________________ > users mailing list > users@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users --Jeff Squyres Cisco Systems