Hi Pavan, enclosed please find the requested config.log file. BTW, I am trying to compile MPICH3 on P775 (Power7 running under AIX) rather than on P755. However, I can check the issue on P755 (Power7 running under Linux) too, if it is needed. With best regards, Victor. _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss