https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116730
--- Comment #7 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (In reply to Hime Haieto from comment #6) > (In reply to Andrew Pinski from comment #4) > > > autoreconf2.69 -vfi > > > > > > Don't do this. > > Where do you think babies...I mean configure comes from? Msot of the generated files are checked into the repo. Please read https://gcc.gnu.org/install/prerequisites.html . Only Flex and Texinfo should be needed if you are building directly from the git repo.