static double
constant(name, arg)
char *name;
int arg;
{
    errno = 0;
	printf ("constant '%s',%d\n", name, arg);
    switch (*name) {
...
	if (strEQ(name, "SQL_PARAM_INPUT_OUTPUT"))
#ifdef SQL_PARAM_INPUT_OUTPUT
		printf("Now I'm here and return %d\n",SQL_PARAM_INPUT_OUTPUT );
	    return SQL_PARAM_INPUT_OUTPUT;
#else
	    goto not_there;
#endif
...