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Add an explicit -lm to the link lines in Makefile.gtk, after two users
reported on the same day that this is now necessary since up-to-date
GNU tools won't consider it sufficient to have libm be a dependency of
other explicitly referenced libraries if you're directly referring to
the contents of libm yourself.

[originally from svn r9448]

--- a/mkfiles.pl

+++ b/mkfiles.pl

@@ -1118,8 +1118,8 @@

     &splitline("CFLAGS := -O2 -Wall -Werror -ansi -pedantic -g " .

 	       (join " ", map {"-I$dirpfx$_"} @srcdirs) .

 	       " `\$(GTK_CONFIG) --cflags` \$(CFLAGS)")."\n".

-    "XLIBS = `\$(GTK_CONFIG) --libs`\n".

-    "ULIBS =#\n".

+    "XLIBS = `\$(GTK_CONFIG) --libs` -lm\n".

+    "ULIBS = -lm#\n".

     "INSTALL=install\n",

     "INSTALL_PROGRAM=\$(INSTALL)\n",

     "INSTALL_DATA=\$(INSTALL)\n",