check_cxx_source_compiles("
#include <netinet/in.h>
#include <resolv.h>

int main(int, char **argv)
{
    res_state statep = {};
    int n = res_nmkquery(statep, 0, argv[1], 0, 0, NULL, 0, NULL, NULL, 0);
    n = res_nsend(statep, NULL, 0, NULL, 0);
    n = dn_expand(NULL, NULL, NULL, NULL, 0);
    return n;
}
" HAVE_LIBRESOLV_FUNCTIONS)