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+?RCS: $Id: Warn_v7ND.U,v 1994/10/29 16:01:46 ram Exp $
+?RCS: Copyright (c) 1991-1993, Raphael Manfredi
+?RCS: You may redistribute only under the terms of the Artistic Licence,
+?RCS: as specified in the README file that comes with the distribution.
+?RCS: You may reuse parts of this distribution only within the terms of
+?RCS: that same Artistic Licence; a copy of which may be found at the root
+?RCS: of the source tree for dist 3.0.
+?RCS: $Log: Warn_v7ND.U,v $
+?RCS: Revision 1994/10/29 16:01:46 ram
+?RCS: patch36: call ./v7 explicitely instead of relying on PATH
+?RCS: Revision 3.0 1993/08/18 12:05:18 ram
+?RCS: Baseline for dist 3.0 netwide release.
+?X: This unit warns V7 sites that they may not have a non-blocking read.
+?X: This unit needs to be mentioned in End.U to get included.
+?MAKE:Warn_v7ND: package Guess
+?MAKE: -pick add $@ %<
+: Warnings
+if ./v7; then
+ cat <<'EOM'
+NOTE: many V7 systems do not have a way to do a non-blocking read. If you
+don't have any of FIONREAD, O_NDELAY, or rdchk(), the $package package
+may not work as well as it might. It might not work at all.