check_cxx_source_compiles(
        "
        #include <stddef.h>
        #include <stdlib.h>
        extern \"C\"  int posix_memalign(void **memptr, size_t alignment, size_t size);
        int main() { void *m; posix_memalign(&m, 16, 1024); }
        " CHECK_STDLIB_H_HAS_POSIX_MEMALIGN)