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+?RCS: $Id: d_csh.U,v 1997/02/28 15:32:18 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_csh.U,v $
+?RCS: Revision 1997/02/28 15:32:18 ram
+?RCS: patch61: added full_csh to preserve the full path even when portable
+?RCS: Revision 3.0 1993/08/18 12:05:53 ram
+?RCS: Baseline for dist 3.0 netwide release.
+?MAKE:d_csh full_csh: csh Setvar
+?MAKE: -pick add $@ %<
+?S: This variable conditionally defines the CSH symbol, which
+?S: indicates to the C program that the C-shell exists.
+?S: This variable contains the full pathname to 'csh', whether or
+?S: not the user has specified 'portability'. This is only used
+?S: in the compiled C program, and we assume that all systems which
+?S: can share this executable will have the same full pathname to
+?S: 'csh.'
+?X: Yes, I know about the C symbol PORTABLE, but I think csh
+?X: is unlikely to move, and I'm too lazy to add all the
+?X: #ifdef PORTABLE sections to the perl source.
+?C: This symbol, if defined, indicates that the C-shell exists.
+?C: If defined, contains the full pathname of csh.
+?H:#$d_csh CSH "$full_csh" /**/
+?LINT:set d_csh
+: get csh whereabouts
+case "$csh" in
+'csh') val="$undef" ;;
+*) val="$define" ;;
+set d_csh
+eval $setvar