[Bug other/106429] Building GCC is Inhibited on old Linux Distributions due to the use of "#!/bin/bash"

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106429

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Also almost all of the GCC build scripts depend on just POSIX sh rather than
bash. It might be the case you need to set CONFIG_SHELL instead as defined as
part of the autoconf .