Wanderlust and BBDB 3.1.2 on stable Gentoo

Hi,

I am using Gentoo linux and BBDB updated to version 3.1.2. The source
is http://download.savannah.gnu.org/releases/bbdb/bbdb-3.1.2.tar.gz.

I am also using wanderlust 2.15.9_p20190623 from
https://github.com/wanderlust/wanderlust/archive/

Sure enough, emacs 26.2 now complains on startup:

"No such file or directory, bbdb-hooks"

Commenting out all bbdb related stuff brings back normal emacs and
wanderlust but of course without bbdb.

I read up on several threads regarding BBDB 3 and saw the message from
Rob Walker (25 Mar 2018) but I can't find bbdb/wl-header in bbdb-wl.el.

I noticed something saying about melpa but prefer to stick with my
vanilla stable portage repositories.

Any ideas how I can BBDB back?

Thanks so much
Petrik