mention NEWS in README, add checks for fork and setpgrp

README

 LibVNCServer: a library for easy implementation of a RDP/VNC server.
-Copyright (C) 2001 Johannes E. Schindelin
+Copyright (C) 2001-2003 Johannes E. Schindelin
+
+If you already used LibVNCServer, you probably want to read NEWS.
 
 What is it?
 -----------
@@ -417,3 +419,4 @@ Contact
 -------
 
 To contact me, mail me: Johannes dot Schindelin at gmx dot de
+

configure.ac

@@ -93,6 +93,8 @@ AC_FUNC_MEMCMP
 AC_FUNC_STAT
 AC_FUNC_STRFTIME
 AC_FUNC_VPRINTF
+AC_FUNC_FORK
+AC_FUNC_SETPGRP
 AC_CHECK_LIB(nsl,gethostbyname)
 AC_CHECK_LIB(socket,socket)
 AC_CHECK_FUNCS([ftime gethostbyname gethostname gettimeofday inet_ntoa memmove memset mkfifo select socket strchr strcspn strdup strerror strstr])