check_c_source_compiles(
    "
        #include <sys/types.h>
        #include <unistd.h>
        int main(void)
        {
            int x = sysconf(_SC_PAGESIZE);
            return 0;
        }
    "
    HAVE_SYSCONF_SC_PAGESIZE
)

elseif(NOT HAVE_GETPAGESIZE AND NOT HAVE_SYSCONF_SC_PAGESIZE)