calculate-overlay/profiles/default/package.use/exactly-one-of

# smp? ( exactly-one-of ( kaapi tbb ) )
sci-libs/vtk tbb

# exactly-one-of ( alsa oss portaudio pulseaudio )
app-accessibility/julius -pulseaudio

# hcache? ( exactly-one-of ( berkdb gdbm lmdb qdbm tokyocabinet )
mail-client/mutt -gdbm -lmdb

# exactly-one-of ( expat xml )
media-libs/libmetalink expat

# exactly-one-of ( openssl nss gnutls )
net-fs/s3fs openssl

# ruby? ( exactly-one-of ( ruby_targets_ruby22 ruby_targets_ruby23 ) )
net-irc/epic5 -ruby_targets_ruby22

# exactly-one-of ( python_single_target_python2_7 python_single_target_python3_4 python_single_target_python3_5 python_single_target_python3_6 )
kde-apps/lokalize -python_single_target_python2_7

# player? ( exactly-one-of ( alsa oss openal ) )
media-sound/wildmidi -openal

# exactly-one-of ( python_single_target_python2_7 python_single_target_python3_6)
app-text/wklej -python_single_target_python2_7 -vim

# exactly-one-of ( l10n_en l10n_fr l10n_it l10n_ja l10n_nl l10n_pl )
app-doc/kicad-doc -l10n_* l10n_en