[sr #110530] Missing #include <string.h> in AC_FUNC_MEMCMP

Follow-up Comment #4, sr #110530 (project autoconf):

> Apple had to make this change in order to support Apple Silicon processors
No it didn't. At best, Apple just doesn't care much about compatibility with
GNU tools.

A simple workaround would be for 'configure' to automatically add
-Wno-error=implicit-function-declaration to CFLAGS if it's needed to compile a
simple test like "does strlen exist?". Perhaps Autoconf should do that.

In the meantime, the advice "configure with
CFLAGS=-Wno-error=implicit-function-declaration" will simply have to become de
rigueur among people who want to run GNU tools on macOS despite Apple's
increasingly-high portability barriers.


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