In case cairo support is (auto-)detected cairo PNG support
is required.
Fixes ([1]):
../gst-libs/gst/video/.libs/libgstvalidatevideo-1.0.so: undefined reference to `cairo_surface_write_to_png'
../gst-libs/gst/video/.libs/libgstvalidatevideo-1.0.so: undefined reference to `cairo_image_surface_create_from_png'
collect2: error: ld returned 1 exit status
[1] http://autobuild.buildroot.net/results/c5e/
c5eb6cb12dba559226c67f5d258cc151aa8a8d3a
[Peter: reworded comment, dropped extra line]
Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
        depends on BR2_PACKAGE_PYTHON
        select BR2_PACKAGE_GST1_PLUGINS_BASE
        select BR2_PACKAGE_PYTHON_PYEXPAT
+       # cairo is autodetected but needs PNG support
+       select BR2_PACKAGE_CAIRO_PNG if BR2_PACKAGE_CAIRO
        help
          GstValidate is a tool that allows GStreamer developers to
          check that the GstElements they write behave the way they
 
 
 GST1_VALIDATE_CONF_OPTS = --disable-sphinx-doc
 
-GST1_VALIDATE_DEPENDENCIES = gstreamer1 gst1-plugins-base host-python python
+GST1_VALIDATE_DEPENDENCIES = \
+       gstreamer1 \
+       gst1-plugins-base \
+       host-python \
+       python \
+       $(if $(BR2_PACKAGE_CAIRO),cairo)
 
 $(eval $(autotools-package))