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+?RCS: $Id: d_rdchk.U,v 3.0 1993/08/18 12:06:51 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: d_rdchk.U,v $
+?RCS: Revision 3.0 1993/08/18 12:06:51 ram
+?RCS: Baseline for dist 3.0 netwide release.
+?MAKE: -pick add $@ %<
+?S: This variable conditionally defines the HAS_RDCHK symbol, which
+?S: indicates to the C program that the rdchk() routine is available
+?S: to find out if there is input pending on an IO channel.
+?C: This symbol, if defined, indicates that the rdchk routine is available
+?C: to find out if there is input pending on an IO channel. Generally
+?C: the routine is used only if FIONREAD and O_NDELAY aren't available.
+?H:#$d_rdchk HAS_RDCHK /**/
+: see if rdchk exists
+set rdchk d_rdchk