Gnuplot supports using fontconfig in gd terminals. There was a bug in
gd-2.0.35 that prevented this from working; therefore the mechanism
was disabled by testing the GD version. Gentoo has backported the fix
to media-libs/gd-2.0.35-r3 so our test can be different.

Patch by Bernardo Costa <bernardofpc@gmail.com>.
Gentoo specific, not to be submitted upstream.
https://bugs.gentoo.org/462996
https://bugs.gentoo.org/363367

--- gnuplot-4.6.2-orig/term/gd.trm
+++ gnuplot-4.6.2/term/gd.trm
@@ -149,7 +149,7 @@
 /* Before version 2.0.36, the libgd function gdFTUseFontConfig() didn't */
 /* do what we need.  Test for earlier versions and ignore it.           */
 #ifdef GD_MAJOR_VERSION
-#  if (GD_MINOR_VERSION > 0  ||  GD_RELEASE_VERSION > 35)
+#  if (GD_MINOR_VERSION > 0  ||  GD_RELEASE_VERSION >= 35)
 #    define gdUseFontConfig(x) gdFTUseFontConfig(x)
 #  endif
 #endif