gnuplot: gd support needs libpng

GD support in gnuplot needs PNG support in GD.
So make sure we are getting the full package to enable it, fixes:
http://autobuild.buildroot.net/results/678bd3babfcb3535e3a9ed1e111f741c3d3101f3/

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

diff --git a/package/gnuplot/gnuplot.mk b/package/gnuplot/gnuplot.mk
index a68c7ae391c9e83b37099991b832625d0eedc2d5..25ba90d8b59b710d3c808b4498d9dd317d37cb7e 100644 (file)
--- a/package/gnuplot/gnuplot.mk
+++ b/package/gnuplot/gnuplot.mk
@@ -24,7 +24,7 @@ GNUPLOT_CONF_OPT = --without-x \
                --without-latex \
                --without-cairo
 
-ifeq ($(BR2_PACKAGE_GD),y)
+ifeq ($(BR2_PACKAGE_GD)$(BR2_PACKAGE_LIBPNG),yy)
 GNUPLOT_CONF_OPT += --with-gd
 GNUPLOT_DEPENDENCIES += gd
 GNUPLOT_CONF_ENV += \