passing args to AC_EGREP_CPP

[Jeff Fulmer]

How can I pass args to AC_EGREP_CPP, namely CFLAGS. 

Jeff

-- 
#include <stdio.h>
int main(){int a[]={74,117,115,116,32,97,110,111,116,104,101,114,32, \
67,32,104,97,99,107,101,114,10,0}; int *b=a;while(*b>0)putchar(*b++);}