[PATCH] improve error for when /usr/include isn't found [PR90835]

[Eric Gallager via Gcc-patches]

This is a pretty simple patch that ought to help Darwin users understand
better why their build is failing when they forget to pass the
--with-sysroot= flag to configure.

gcc/ChangeLog:

    PR target/90835
    * Makefile.in: improve error message when /usr/include is
    missing

0001-improve-error-for-when-usr-include-isn-t-found.patch
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