Hello! Flawed logic: Linux isn't the only system with procfs. NetBSD has procfs too and may have /proc/cpuinfo as well, but it isn't Linux. I didn't check if FreeBSD has "cpuinfo" as well, FreeBSD 6.3 doesn't but it's being desupported soon.
Difference against openmpi-1.5a1r22193 snapshot. --- opal/mca/pstat/linux/configure.m4.orig 2009-11-04 17:57:36.000000000 +0300 +++ opal/mca/pstat/linux/configure.m4 2010-01-14 02:16:08.000000000 +0300 @@ -23,7 +23,7 @@ AC_DEFUN([MCA_pstat_linux_CONFIG],[ case "${host}" in - i?86-*|x86_64*|ia64-*|powerpc-*|powerpc64-*|sparc*-*) + i?86-*linux*|x86_64*linux*|ia64-*linux*|powerpc-*linux*|powerpc64-*linux*|sparc*-*linux*) AS_IF([test -r "/proc/cpuinfo"], [pstat_linux_happy="yes"], [pstat_linux_happy="no"]) -- HE CE3OH...