Dear Maintainer,

   * What led up to the situation?
I am the DM for budgie-desktop - I cannot compile the latest upstream budgie-desktop that depends on libxfce4windowing 4.20.4
   * What exactly did you do (or not do) that was effective (or
     ineffective)?
Compiling budgie-desktop preview 2 depends on 4.20.4 capability where the dev package ships the vapi for libxfce4windowing
   * What was the outcome of this action?
The compilation fails
   * What outcome did you expect instead?
The compilation should work - budgie-desktop no longer ships with its own vapi - upstream budgie states its requirement
is for libxfce4windowing v4.20.4 with its own shipped vapi

I note - the current package is autotools based.

I've tested via a meson build - with the option -Dvala=yes and a B/D of valac to allow vapigen to be installed

I'm not sure the current autotools files has the same vala based option - maybe --enable-vala in d/rules ?

If you wish, I'm happy to attach a debdiff that switches the build of libxfce4windowing to use meson?