I suggest upgrading to the current version of Gnulib. This patch:
http://git.savannah.gnu.org/cgit/gnulib.git/commit/?id=44f73b8deccadf3e0d668f493d7dc3babcaa3144dated 2015 should work around your particular problem. Perhaps a different patch might be needed for g++ 4.6, though I'd like some confirmation of that from someone actually using old g++.
