AC_FUNC_MEMCMP
AC_FUNC_UTIME_NULL
-AC_CHECK_FUNCS(waitpid getcwd strdup strerror chown chmod mknod)
+AC_CHECK_FUNCS(waitpid wait4 getcwd strdup strerror chown chmod mknod)
AC_CHECK_FUNCS(fchmod fstat strchr readlink link utime utimes strftime)
AC_CHECK_FUNCS(memmove getopt_long lchown vsnprintf snprintf setsid glob strpbrk)
AC_CHECK_FUNCS(strlcat strlcpy)