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+?RCS: $Id: d_dup2.U,v 3.0 1993/08/18 12:05:56 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_dup2.U,v $
+?RCS: Revision 3.0 1993/08/18 12:05:56 ram
+?RCS: Baseline for dist 3.0 netwide release.
+?MAKE: -pick add $@ %<
+?S: This variable conditionally defines HAS_DUP2 if dup2() is
+?S: available to duplicate file descriptors.
+?C: This symbol, if defined, indicates that the dup2 routine is
+?C: available to duplicate file descriptors.
+?H:#$d_dup2 HAS_DUP2 /**/
+: see if dup2 exists
+set dup2 d_dup2