The changes I made to xbps-src show-build-deps now will print only
real source package names, without version components or virtual packages,
so that fbulk does not do any extra work.
This is a modified version of DragonFlyBSD's fastbulk utility, that
has been adapted for xbps/xbps-src and contains multiple improvements
like configurable logging path, skipping building non working packages
(broken/only_for_archs), etc.
A manual page will be pushed soon.
This is still WIP, it needs more changes to support building a customizable
set of packages and other additions.