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configure error message for missing libpfm is not informative enough

On the ppc64 architecture, the libpfm library is used to get perf_events
encodings for events, so the configure script checks for the availability
of that library when building for ppc64. If the library is missing, the
configure error message is:

checking for perfmon/pfmlib.h... no
configure: error: pfmlib.h not found; usually provided in papi devel package

However, some newer distros (like Fedora 19) are now delivering separate
packages for libpfm and papi, instead of bundling them together. The patch
provided herein changes the configure message to reflect that change in
packaging.

Signed-off-by: Maynard Johnson <maynardj@us.ibm.com>

Maynard Johnson Maynard Johnson 2013-10-09

changed configure.ac
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