Don't AC_REPLACE_FUNCS(difftime).

configure.in

-dnl $Id: configure.in,v 1.16 1994/03/06 20:07:46 ceder Exp $
+dnl $Id: configure.in,v 1.17 1994/04/04 14:03:56 ceder Exp $
 dnl Configuration for LysKOM
-AC_REVISION($Revision: 1.16 $)
+AC_REVISION($Revision: 1.17 $)
 AC_INIT(src/server/lyskomd.h)
 AC_PROG_CC
 AC_SUBST(CFLAGS)
@@ -61,7 +61,7 @@ AC_HAVE_LIBRARY(socket) dnl socket() et c on Solaris 2.
 AC_HAVE_LIBRARY(nsl) dnl Low-level networking code on Solaris 2.
 AC_HAVE_LIBRARY(i) dnl For setlocale() on Ultrix.
 AC_HAVE_FUNCS(difftime getdtablesize sysconf strchr getcwd vfprintf)
-AC_REPLACE_FUNCS(memcpy difftime strerror remove memset memchr)
+AC_REPLACE_FUNCS(memcpy strerror remove memset memchr)
 [DEFS="$DEFS -DBUGGY_INET_NTOA=1 -DENCRYPT_PASSWORDS=1 -DSERVER=1"]
 AC_OUTPUT(Makefile
 doc/Makefile