Require GNU make to build Emacs
Ref: http://debbugs.gnu.org/16717#45 If no-one objects, we can then start getting rid of some of the convoluted Makefile hacks that exist to support non-GNU makes. * configure.ac: Require GNU make. (HAVE_GNU_MAKE): Remove. * INSTALL, etc/NEWS, etc/PROBLEMS: Update for this change. * Makefile.in: Comment.
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