I realize just now that one of my machines uses emerge ... --newuse ... and the other uses emerge ... --changed-use ... Both run gentoo stable.
I imagine this discrepancy has been there for a long while and to date has caused no particular difficulty. However, today the --changed-use machine can't --depclean and running emerge --pretend --newuse ... @world shows 15 rebuilds while --changed-use shows none. It looks like all the rebuilds are caused by "negative" uses, especially PYTHON_TARGETS="-python3_6%" My first thought was to run an emerge --newuse ... @world and then proceed with --depclean'ing but am cautious about changing settings involving python (I have no personal python scripts). eselect python show indicates python3.4, which I realize has end of life next year. Any advice would be appreciated. Thanks in advance, allan