rPkgConf :: DynP ()
clearPkgConf = upd $ \s -> s { extraPkgConfs = const [] }

ex
clearPkgConf :: DynP ()
clearPkgConf = upd $ \s -> s { extraPkgConfs = const [] }
clearPkgConf = upd $ \s -> s { extraPkgConfs = const [] }