Hello I was trying to install mpich-3.1 but stopped at the first step: configuration. The Fortran compiler I have is absoft. I tried both the configuration command given by Readme file of mpich-3.1 and the configuration line given by Absoft. Both have the following error message: configure: error: The selected Fortran 90 compiler /Applications/Absoft11.5/bin/af90 does not work with the selected Fortran 77 compiler /Applications/Absoft11.5/bin/af77. Use the environment variables FC and F77 respectively to select compatible Fortran compilers. The check here tests to see if a main program compiled with the Fortran 90 compiler can link with a subroutine compiled with the Fortran 77 compiler. Attached please find the log files. I really appreciate your help! Best regards Yan ------------------ Yan Bai 216 Harkness Hall, RC 270156 Department of Economics University of Rochester 585.275.4196 (office) 585.256.2309 (fax) [email protected] https://sites.google.com/site/yanbai06/