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When gcc default include path(gcc -xc -v -, "#include <...> search starts here:" section) doesn't contain '/usr/include' under the unusual OS, PHP_ADD_INCLUDE [https://github.com/php/php-src/blob/master/acinclude.m4#L484] `if test "$1" != "/usr/include"...` makes we lost the chance to add '-I/usr/include' as a compile option. configure run successfully, but make failed.
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