https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118369
--- Comment #11 from Matthias Klose <doko at gcc dot gnu.org> --- gcc-multilib and the gcc cross compilers conflict, and cannot be installed together, because some header files for the non-default multilibs are installed on the standard include path. In practice, this doesn't hurt, but if you want to build a native multilib'd compiler, then you have to remove the cross gcc packages. #gcc on OFTC should be fine.
