AC_CHECK_DECLS([getgrgid],,, [#include <grp.h>])
AC_CHECK_DECLS([getpwuid],,, [#include <pwd.h>])
AC_CHECK_DECLS([time],,, [#include <time.h>])
AC_CHECK_DECLS([getgrgid],,, [#include <grp.h>])
AC_CHECK_DECLS([getpwuid],,, [#include <pwd.h>])
AC_CHECK_DECLS([time],,, [#include <time.h>])