node001:~$ emerge -k gcc
Calculating dependencies

!!! Problem in 'sys-devel/gcc' dependencies.
!!! dictionary update sequence element #2 has length 1; 2 is required exceptions

Traceback (most recent call last):
  File "/usr/bin/emerge", line 4105, in ?
    emerge_main()
  File "/usr/bin/emerge", line 4100, in emerge_main
    myopts, myaction, myfiles, spinner)
  File "/usr/bin/emerge", line 3497, in action_build
    retval, favorites = mydepgraph.select_files(myfiles)
  File "/usr/bin/emerge", line 955, in select_files
    self.mysd = self.select_dep(myroot, mykey, arg=raw_args[i])
  File "/usr/bin/emerge", line 1112, in select_dep
    myeb_matches = portdb.xmatch("match-visible", x)
  File "/usr/lib/portage/pym/portage.py", line 5167, in xmatch
    myval=match_from_list(mydep,self.xmatch("list-visible",None,mydep=mydep,mykey=mykey))
  File "/usr/lib/portage/pym/portage.py", line 5153, in xmatch
    myval=self.gvisible(self.visible(self.cp_list(mykey)))
  File "/usr/lib/portage/pym/portage.py", line 5252, in gvisible
    keys, eapi = self.aux_get(mycpv, ["KEYWORDS", "EAPI"])
  File "/usr/lib/portage/pym/portage.py", line 4867, in aux_get
    mydata = self.auxdb[mylocation][mycpv]
  File "/usr/lib/portage/pym/cache/flat_hash.py", line 28, in __getitem__
    d = self._parse_data(myf, cpv)
  File "/usr/lib/portage/pym/cache/flat_hash.py", line 39, in _parse_data
    d = dict(map(lambda x:x.rstrip().split("=", 1), data))
ValueError: dictionary update sequence element #2 has length 1; 2 is required