[Bug other/82708] libmpx fails to compile due to PATH_MAX

[joseph at codesourcery dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82708

--- Comment #3 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
That's not the test I'm talking about.  The relevant one is 
gcc/Makefile.in's LIMITS_H_TEST, run during a build stage rather than a 
configure stage, so you need to look at the setting of 
BUILD_SYSTEM_HEADER_DIR and how it got that value.