>>> /usr/lib64/pkgconfig/nss.pc
>>> Safely unmerging already-installed instance...
Traceback (most recent call last):
File "/usr/bin/emerge", line 4358, in ?
retval = emerge_main()
File "/usr/bin/emerge", line 4353, in emerge_main
myopts, myaction, myfiles, spinner)
File "/usr/bin/emerge", line 3833, in action_build
retval = mergetask.merge(
File "/usr/bin/emerge", line 2287, in merge
prev_mtimes=ldpath_mtimes)
File "/usr/lib/portage/pym/portage.py", line 3128, in doebuild
vartree=vartree, prev_mtimes=prev_mtimes)
File "/usr/lib/portage/pym/portage.py", line 3347, in merge
mydbapi=mydbapi, prev_mtimes=prev_mtimes)
File "/usr/lib/portage/pym/portage.py", line 6619, in merge
cleanup=cleanup, mydbapi=mydbapi, prev_mtimes=prev_mtimes)
File "/usr/lib/portage/pym/portage.py", line 6273, in treewalk
self.unmerge(oldcontents, trimworld=0, ldpath_mtimes=prev_mtimes)
File "/usr/lib/portage/pym/portage.py", line 5851, in unmerge
self.settings, 0, 0, self.vartree.dbapi)
File "/usr/lib/portage/pym/portage.py", line 2614, in doebuild_environment
raise portage_exception.UnsupportedAPIException(mycpv, eapi)