Macro: ag_check

AC_DEFUN(AG_CHECK_STRFTIME,[
  AC_MSG_CHECKING([whether strftime() works])
  AC_CACHE_VAL([ag_cv_strftime],[
  AC_TRY_RUN([#include <time.h>
char t_buf[ 64 ];
int main() {
  static const char z[] = "Thursday Aug 28 240";
  struct tm tm;
  tm.tm_sec   = 36;  /* seconds after the minute [0, 61]  */
  tm.tm_min   = 44;  /* minutes after the hour [0, 59] */
  tm.tm_hour  = 12;  /* hour since midnight [0, 23] */
  tm.tm_mday  = 28;  /* day of the month [1, 31] */
  tm.tm_mon   =  7;  /* months since January [0, 11] */
  tm.tm_year  = 86;  /* years since 1900 */
  tm.tm_wday  =  4;  /* days since Sunday [0, 6] */
  tm.tm_yday  = 239; /* days since January 1 [0, 365] */
  tm.tm_isdst =  1;  /* flag for daylight savings time */
  strftime( t_buf, sizeof( t_buf ), "%A %b %d %j", &tm );
  return (strcmp( t_buf, z ) != 0); }],[ag_cv_strftime=yes],[ag_cv_strftime=no],[ag_cv_strftime=no]
           ) # end of TRY_RUN]) # end of CACHE_VAL

 AC_MSG_RESULT([$ag_cv_strftime])
 if test x$ag_cv_strftime = xyes
 then
   AC_DEFINE(HAVE_STRFTIME, 1,
      [Define this if strftime() works])
 fi
 ]) # end of AC_DEFUN
ag_check_strftime
