https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87030
--- Comment #9 from joseph at codesourcery dot com <joseph at codesourcery dot com> --- On Sat, 8 Sep 2018, iains at gcc dot gnu.org wrote: > 2. Actually, you get the same failure on GNU-Linux if you try to configure > defaults on (for example) an x86_64 system without 32bit libs installed (one > has to add --disable-multilib there, or install 32b libs), so automation is > not > the default on Linux. The toplevel configure.ac code # Special user-friendly check for native x86_64-linux build, if # multilib is not explicitly enabled. case "$target:$have_compiler:$host:$target:$enable_multilib" in x86_64-*linux*:yes:$build:$build:) # Make sure we have a development environment that handles 32-bit [...] is meant to give a more helpful error in that case: AC_MSG_ERROR([I suspect your system does not have 32-bit development libraries (libc and headers). If you have them, rerun configure with --enable-multilib. If you do not have them, and want to build a 64-bit-only compiler, rerun configure with --disable-multilib.])