1s/^char \$ac_func();/#if defined(__cplusplus) || defined(c_plusplus)\ 2#include <stdlib.h>\ 3#include <string.h>\ 4#else\ 5char \$ac_func();\ 6#endif/ 7s/^\$ac_func();/#if defined(__cplusplus) || defined(c_plusplus)\ 8void (*pfun)(void) = (void (*)(void))\$ac_func;\ 9#else\ 10\$ac_func();\ 11#endif/ 12s/exit *(/return (/ 13s/CFLAGS=" *-g */CFLAGS="/ 14s/CFLAGS=" *-O2 */CFLAGS="/ 15s/CXXFLAGS=" *-g */CXXFLAGS="/ 16s/CXXFLAGS=" *-O2 */CXXFLAGS="/ 17 18