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.

git-svn-id: svn://svn.tartarus.org/sgt/puzzles@9448 cda61777-01e9-0310-a592-d414129be87e

diff --git a/mkfiles.pl b/mkfiles.pl
index 4ab0796..3df8d16 100755 (executable)
--- a/mkfiles.pl
+++ b/mkfiles.pl
@@ -1118,8 +1118,8 @@ if (defined $makefiles{'gtk'}) {
     &splitline("CFLAGS := -O2 -Wall -Werror -ansi -pedantic -g " .
               (join " ", map {"-I$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",