--- rpl/tools/Makefile.am	2013/03/21 14:13:55	1.89
+++ rpl/tools/Makefile.am	2013/03/22 12:26:54	1.90
@@ -38,7 +38,7 @@ all:
 		echo -n LD_MOTIF_ >> openmotif.lib; \
 		grep "^X_XMU" @OPENMOTIF@/config.log | tr -d "'" >> openmotif.lib; \
 	fi
-	if [ @GNUPLOT_COMPILATION@ ]; then \
+	if [ x"@GNUPLOT_COMPILATION@" != x ]; then \
 			$(MAKE) $(AM_MAKEFLAGS) -C @GNUPLOT@ $@; fi
 
 clean distclean: