https://bugs.gentoo.org/396251
http://sourceforge.net/tracker/?func=detail&aid=3441899&group_id=2055&atid=102055

--- gnuplot-4.4.4-orig/term/lua/gnuplot-tikz.lua
+++ gnuplot-4.4.4/term/lua/gnuplot-tikz.lua
@@ -251,6 +251,7 @@
   gp.write(string.format("\\begin{tikzpicture}[gnuplot%s]\n",global_opt))
   gp.write(string.format("%%%% generated with GNUPLOT %sp%s (%s; terminal rev. %s, script rev. %s)\n%%%% %s\n",
       term.gp_version, term.gp_patchlevel,
+      _VERSION,
       string.sub(term.lua_term_revision,7,-3),
       pgf.REVISION,os.date()))
   if font ~= "" then