AC_REVISION wants a Revision:, not a Id:.

configure.in

-dnl Process this file with autoconf to produce a configure script.
-dnl This configure.in was derived from the configure.in in the
-dnl GNU regex package, rel 0.11.  Since LysKOM uses that package,
-dnl this configure script must include everything it needs.
-AC_REVISION($Id: configure.in,v 1.6 1993/10/12 23:22:44 ceder Exp $)
+dnl $Id: configure.in,v 1.7 1993/10/13 19:28:49 ceder Exp $
+dnl Configuration for LysKOM
+AC_REVISION($Revision: 1.7 $)
 AC_INIT(src/server/lyskomd.h)
 AC_PROG_CC
 AC_AIX