[Bug 217682] net/openmpi2: remove implicit -L/usr/local/lib

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217682

            Bug ID: 217682
           Summary: net/openmpi2: remove implicit -L/usr/local/lib
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: danilo at FreeBSD.org
          Reporter: tijl at FreeBSD.org
             Flags: maintainer-feedback?(danilo at FreeBSD.org)
          Assignee: danilo at FreeBSD.org

Created attachment 180696
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=180696&action=edit
patch

While working on a port of OpenCoarrays (bug 217283) it was discovered that
Open MPI 2 runs the compiler with "-L/usr/local/lib" before
"-L/usr/local/mpi/openmpi2/lib -lmpi".  You can verify this by running
"/usr/local/mpi/openmpi2/bin/mpicc -show".  This causes
/usr/local/lib/libmpi.so to be used if it exists instead of the Open MPI
library.

-L/usr/local/lib is added by the configure script.  The attached patch changes
CONFIGURE_ARGS to avoid this.  To allow the configure script to still find
external libraries USES=localbase is added.  A post-patch command needed to be
added to set the full path of hwloc.h like --with-hwloc=${LOCALBASE} does. 
With --with-hwloc=external just the name "hwloc.h" is used.  This fails because
the work directory contains its own hwloc.h which gets included instead of the
system header.

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