http://bugs.gentoo.org/201871
Disable texhash to prevent sandbox violation

--- gnuplot-4.2.3-orig/share/LaTeX/Makefile.am	2006-10-02 23:05:30.000000000 +0200
+++ gnuplot-4.2.3/share/LaTeX/Makefile.am	2008-08-26 20:09:43.000000000 +0200
@@ -11,8 +11,7 @@
 	  installdir=`kpsexpand '$$TEXMFLOCAL'/tex/latex/gnuplot |sed "s%^.*share/%$(prefix)/share/%"` ; \
 	  $(top_srcdir)/mkinstalldirs $(DESTDIR)$$installdir ; \
 	  if [ ! -f $(DESTDIR)$$installdir/gnuplot.cfg ]; then \
-	    $(INSTALL_DATA) $(srcdir)/gnuplot.cfg $(DESTDIR)$$installdir/gnuplot.cfg && \
-	    texhash; \
+	    $(INSTALL_DATA) $(srcdir)/gnuplot.cfg $(DESTDIR)$$installdir/gnuplot.cfg; \
 	  fi ; \
 	  fi