OK, I see. Thanks for you response. I just migrated from Gentoo. It uses this version of 'which': https://carlowood.github.io/which/ LinuxFromScratch uses this one (probably the same): http://ftp.gnu.org/gnu/which/which-2.21.tar.gz
I didn't found this package in debian repository, that's why I decided to make bugreport. Thanks again!
