https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100140
--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Neither of these projects lives on github. For glibc documentation see https://www.gnu.org/software/libc/libc.html sources should be grabbed from https://www.gnu.org/software/libc/sources.html but in the documentation you'll see (and configure warns loudly) that configuring glibc for prefix other than /usr is highly discouraged. GCC has https://gcc.gnu.org home page with documentation and sources in https://gcc.gnu.org/git/gcc.git Anyway, this looks like a user error to me.
