./scripts/feeds update -a ... Checking 'file'... ok. Checking 'rsync'... ok. Checking 'which'... failed. Checking 'ldconfig-stub'... ok. Build dependency: Please install 'which' Prerequisite check failed. Use FORCE=1 to override. ...
"which" is definitely installed on my system:
which --version GNU which v2.21, Copyright (C) 1999 - 2015 Carlo Wood. GNU which comes with ABSOLUTELY NO WARRANTY; This program is free software; your freedom to use, change and distribute this program is protected by the GPL.
OS: Fedora 34