appmenu-gtk configuration:

        Prefix:                 /usr
        GTK+ API:               2.0

>>> Source configured.
>>> Compiling source in /var/calculate/tmp/portage/x11-misc/appmenu-gtk-0.3.0/work/appmenu-gtk-0.3.0 ...
make -j1
Making all in build
Making all in autotools
Making all in src
  CC    bridge.o
In file included from bridge.c:41:0:
bridge.h:23:33: fatal error: gtk/ubuntumenuproxy.h: No such file or directory
compilation terminated.
make[3]: *** [libappmenu_la-bridge.lo] Error 1
make[2]: *** [all] Error 2
make[1]: *** [all-recursive] Error 1
make: *** [all] Error 2
 * ERROR: x11-misc/appmenu-gtk-0.3.0 failed (compile phase):
 *   emake failed
 *
 * If you need support, post the output of 'emerge --info =x11-misc/appmenu-gtk-0.3.0',
 * the complete build log and the output of 'emerge -pqv =x11-misc/appmenu-gtk-0.3.0'.
 * This ebuild is from an overlay named 'stuff': '/var/lib/layman/stuff/'
 * The complete build log is located at '/var/calculate/tmp/portage/x11-misc/appmenu-gtk-0.3.0/temp/build.log'.
 * The ebuild environment file is located at '/var/calculate/tmp/portage/x11-misc/appmenu-gtk-0.3.0/temp/environment'.
 * S: '/var/calculate/tmp/portage/x11-misc/appmenu-gtk-0.3.0/work/appmenu-gtk-0.3.0'

>>> Failed to emerge x11-misc/appmenu-gtk-0.3.0, Log file: