pkg/52250: gmp and mpfr not found by some packages

[joern.clausen%uni-bielefeld.de@localhost]

>Number:         52250
>Category:       pkg
>Synopsis:       gmp and mpfr not found by some packages
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon May 22 07:15:00 +0000 2017
>Originator:     Joern Clausen
>Release:        
>Organization:
University of Bielefeld
>Environment:
>Description:
This is a followup to pkg/52244, because I am afraid a more fundamental problem might get lost in a very specific PR.

I am using a stand-alone GCC 4.8.5 on Solaris 11.2. This configuration hasn't been changed for more than a year. Since recently, I can't build some packages relying on gmp and mpfr. After configuring e.g. "security/gnutls", I get

$ bmake show-var VARNAME=BUILDLINK_PREFIX.gmp
/usr

or for print/luatex I get

$ bmake show-var VARNAME=BUILDLINK_PREFIX.mpfr
/usr

Other packages show a correct dependency, e.g. "security/nettle":

$ bmake show-var VARNAME=BUILDLINK_PREFIX.gmp
/opt/pkg-hrz/20170105


gmp and mpfr are two libraries that are used when bootstrapping GCC, so this might be relevant. But my GCC is installed somewhere under /opt, a path in /usr should not be used in any case.
>How-To-Repeat:

>Fix: