[sr #110377] AC_CACHE_CHECK is affected by 's' variable override.

Follow-up Comment #2, sr #110377 (project autoconf):

Your fix helped, thank you!

The only other tweak I had to do was to avoid here-document split across
multiple expressions:


    AS_IF([! $CC -E -xc - <<SRC >/dev/null], [
        @%:@if defined __APPLE_CC__ && defined __clang_major__ &&
__clang_major__ < 3
        @%:@error premature clang
        @%:@endif
SRC
        AC_MSG_ERROR([clang version 3.0 or later is required])
    ])


Tried to fix it as https://github.com/ruby/ruby/pull/3773. I assume initial
for was never guaranteed to work.

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