How to regenerate aclocal.m4?

[Zopolis0 via Gcc]

I'm trying to regenerate autotools files in liboffloadmic (and other
directories) but when running automake it tells me I need to run aclocal,
which gives me a warning about not finding AM_ENABLE_MULTILIB in library,
which then translates into an autoconf error. How do I fix this? Is there a
specific aclocal version?