I have the current versions of openmpi and libopenmpi installed in Cygwin-64. The mpif90 command (MPI wrapper for Gfortran) does not execute, even though /usr/bin/mpif90 exists. The problem is that /usr/bin/mpif90 is a symbolic link to /usr/bin/mpifort.exe, which does not exist. However /usr/bin/mpifort does exist (and is itself a link to /usr/bin/opal_wrapper.exe). I have cured this by changing the target of /usr/bin/mpif90: $ ln -sf /usr/bin/mpifort /usr/bin/mpif90 Mark Hadfield 51 Volga St Wellington 6023, NZ -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple