https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117396
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- There are others which have a similar help file issue: AC_ARG_ENABLE(ld, [AS_HELP_STRING([[--enable-ld[=ARG]]], [build ld @<:@ARG={default,yes,no}@:>@])], ENABLE_LD=$enableval, ENABLE_LD=yes) ... AC_ARG_ENABLE(libada, [AS_HELP_STRING([--enable-libada], [build libada directory])], ENABLE_LIBADA=$enableval, ENABLE_LIBADA=yes) ... AC_ARG_ENABLE(libssp, [AS_HELP_STRING([--enable-libssp], [build libssp directory])], ENABLE_LIBSSP=$enableval, ENABLE_LIBSSP=yes) ... AC_ARG_ENABLE(lto, [AS_HELP_STRING([--enable-lto], [enable link time optimization support])], enable_lto=$enableval, enable_lto=yes; default_enable_lto=yes) So I am not sure which is correct to do. Anyways the documentation: https://gcc.gnu.org/install/configure.html Documents --disable-multilib correctly. --help on configure is only a short form of the help.