https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106482
--- Comment #2 from Daniel Richard G. <skunk at iskunk dot org> ---
It would be good to have a specific minimum version of GCC in the documented
prerequisites, as the current text ("an existing GCC binary (version 4.8 or
later)", albeit referring to non-bootstrap builds) misses edge cases like this.
