gnome-panel build failure from last Ubuntu bulk build

[Benny Siegert <bsiegert%gmail.com@localhost>]

I was looking at
https://us-east.manta.joyent.com/pkgsrc/public/reports/Linux/ubuntu17.04/trunk/x86_64/20180418.0005//gnome-panel-2.32.1nb54/build.log,
and the failure there seems indicative of something going very wrong much
earlier:

   CCLD   notification-area-applet
/usr/bin/ld: /home/pbulk/build/x11/gnome-panel/work/.buildlink/lib/
libgtk-x11-2.0.so: undefined reference to symbol 'cairo_clip'
/home/pbulk/build/x11/gnome-panel/work/.buildlink/lib/libcairo.so: error
adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
Makefile:586: recipe for target 'testtray' failed
make[4]: *** [testtray] Error 1
make[4]: *** Waiting for unfinished jobs....
/usr/bin/ld: /home/pbulk/build/x11/gnome-panel/work/.buildlink/lib/
libgtk-x11-2.0.so: undefined reference to symbol 'gdk_window_get_parent'
/home/pbulk/build/x11/gnome-panel/work/.buildlink/lib/libgdk-x11-2.0.so:
error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status

Any ideas?


-- 
Benny