[Bug 206075] lang/gcc6-devel: fails to build, needs USES=localbase

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=206075

            Bug ID: 206075
           Summary: lang/gcc6-devel: fails to build, needs USES=localbase
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: Individual Port(s)
          Assignee: gerald at FreeBSD.org
          Reporter: amdmi3 at FreeBSD.org
          Assignee: gerald at FreeBSD.org
             Flags: maintainer-feedback?(gerald at FreeBSD.org)

I've got a build failure while trying to upgrade gcc6-devel to the latest
version:

.././../gcc-6-20160103/gcc/graphite-dependences.c:240:3: error: no matching
function for call to 'isl_union_map_foreach_map'
  isl_union_map_foreach_map (x, max_number_of_out_dimensions, (void *) &max);
  ^~~~~~~~~~~~~~~~~~~~~~~~~

I could not reproduce it in poudriere, so the cause is probably some locally
installed package. As a wild guess, I've added localbase to USES of gcc6-devel
and that fixed the problem, so the guess is that it includes some headers from
system instead of its local ones.

Complete logs before/after adding USES=localbase:

https://people.freebsd.org/~amdmi3/gcc6.fail.log
https://people.freebsd.org/~amdmi3/gcc6.ok.log

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