!!! resolution failed
!!! request ( ( ('repo.livefs',) EqualityMatch: =False || ( ('category',) == virtual && ('package_is_real',) EqualityMatch: =False ) ) && =mail-mta/courier-1.5.1 ), mode none
!!! trying mail-mta/courier-1.5.1
!!!   request ( not (!mail-mta/nullmailer) && mail-mta/nullmailer ), mode none
!!!   failed due to depend blocker: !mail-mta/nullmailer conflicts w/ [<MutatedPkg pkg=<pkgcore.vdb.ondisk._WrappedInstalledPkg object at 0x10dc94fd0> overrides=('bdepend', 'depend', 'rdepend', 'pdepend', 'idepend') @0x10dc6b570>]
!!!   removing choices involving !mail-mta/nullmailer

Failures encountered:
!!! failed '( ( ('repo.livefs',) EqualityMatch: =False || ( ('category',) == virtual && ('package_is_real',) EqualityMatch: =False ) ) && =mail-mta/courier-1.5.1 )'
potentials:
repo gentoo: [ ebuild src: mail-mta/courier-1.5.1 ]