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Aha, even better: a Makefile hack that causes auto-detection of GTK
2 and fallback to GTK 1.2.

[originally from svn r5705]

--- a/mkfiles.pl

+++ b/mkfiles.pl

@@ -874,7 +874,12 @@

     "# You can define this path to point at your tools if you need to\n".

     "# TOOLPATH = /opt/gcc/bin\n".

     "CC = \$(TOOLPATH)cc\n".

-    "GTK_CONFIG = gtk-config\n".

+    "# You can manually set this to `gtk-config' or `pkg-config gtk+-1.2'\n".

+    "# (depending on what works on your system) if you want to enforce\n".

+    "# building with GTK 1.2, or you can set it to `pkg-config gtk+-2.0'\n".

+    "# if you want to enforce 2.0. The default is to try 2.0 and fall back\n".

+    "# to 1.2 if it isn't found.\n".

+    "GTK_CONFIG = sh -c 'pkg-config gtk+-2.0 \$\$0 2>/dev/null || gtk-config \$\$0'\n".

     "\n".

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

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