After installation of Wanderlust in Emacs I’ve recognized that package.el has stopped working with message:
Symbol’s function definition is void: mailcap-parse-mailcaps
I did some investigation and figured out that it is conflict between mailcap.el in FLIM package and mailcap.el in Gnus. The first one is not defining mailcap-parse-mailcaps function.
Quick fix is loading mailcap.el from Gnus manually before FLIM loading:
I’m not sure that this is correct solution but it seems work.