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diff --git a/mcon/U/d_sigsetjmp.U b/mcon/U/d_sigsetjmp.U
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+?RCS: $Id$
+?RCS:
+?RCS: Copyright (c) 1996, Andy Dougherty
+?RCS: Copyright (c) 1991-1997, 2004-2006, Raphael Manfredi
+?RCS:
+?RCS: You may redistribute only under the terms of the Artistic License,
+?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 License; a copy of which may be found at the root
+?RCS: of the source tree for dist 4.0.
+?RCS:
+?RCS: You may distribute under the terms of either the GNU General Public
+?RCS: License or the Artistic License, as specified in the README file.
+?RCS:
+?RCS: $Log: d_sigsetjmp.U,v $
+?RCS: Revision 3.0.1.1  1997/02/28  15:44:33  ram
+?RCS: patch61: created
+?RCS:
+?MAKE:d_sigsetjmp: Setvar cat +cc +ccflags +ldflags libs rm
+?MAKE:	-pick add $@ %<
+?S:d_sigsetjmp:
+?S:	This variable conditionally defines the HAS_SIGSETJMP symbol,
+?S:	which indicates that the sigsetjmp() routine is available to
+?S:	call setjmp() and optionally save the process's signal mask.
+?S:.
+?C:HAS_SIGSETJMP:
+?C:	This variable indicates to the C program that the sigsetjmp()
+?C:	routine is available to save the calling process's registers
+?C:	and stack environment for later use by siglongjmp(), and
+?C:	to optionally save the process's signal mask.  See
+?C:	Sigjmp_buf, Sigsetjmp, and Siglongjmp.
+?C:.
+?C:Sigjmp_buf:
+?C:	This is the buffer type to be used with Sigsetjmp and Siglongjmp.
+?C:.
+?C:Sigsetjmp:
+?C:	This macro is used in the same way as sigsetjmp(), but will invoke
+?C:	traditional setjmp() if sigsetjmp isn't available.
+?C:	See HAS_SIGSETJMP.
+?C:.
+?C:Siglongjmp:
+?C:	This macro is used in the same way as siglongjmp(), but will invoke
+?C:	traditional longjmp() if siglongjmp isn't available.
+?C:	See HAS_SIGSETJMP.
+?C:.
+?H:?%<:#$d_sigsetjmp HAS_SIGSETJMP	/**/
+?H:?%<:#ifdef HAS_SIGSETJMP
+?H:?%<:#define Sigjmp_buf sigjmp_buf
+?H:?%<:#define Sigsetjmp(buf,save_mask) sigsetjmp((buf),(save_mask))
+?H:?%<:#define Siglongjmp(buf,retval) siglongjmp((buf),(retval))
+?H:?%<:#else
+?H:?%<:#define Sigjmp_buf jmp_buf
+?H:?%<:#define Sigsetjmp(buf,save_mask) setjmp((buf))
+?H:?%<:#define Siglongjmp(buf,retval) longjmp((buf),(retval))
+?H:?%<:#endif
+?H:.
+?W:%<:Sigjmp_buf Sigsetjmp Siglongjmp
+?F:!set
+?LINT:set d_sigsetjmp
+: see if sigsetjmp exists
+echo " "
+case "$d_sigsetjmp" in
+'')
+	$cat >set.c <<'EOP'
+#include <setjmp.h>
+sigjmp_buf env;
+int set = 1;
+int main(void)
+{
+	if (sigsetjmp(env,1))
+		return set;
+	set = 0;
+	siglongjmp(env, 1);
+	return 1;
+}
+EOP
+	if $cc $ccflags $ldflags -o set set.c $libs >/dev/null 2>&1; then
+		if ./set >/dev/null 2>&1; then
+			echo "POSIX sigsetjmp() found." >&4
+			val="$define"
+		else
+			$cat >&4 <<EOM
+Uh-Oh!
+You have POSIX sigsetjmp() and siglongjmp(), but they do not work properly!!
+I'll ignore them.
+EOM
+			val="$undef"
+		fi
+	else
+		echo "sigsetjmp() not found." >&4
+		val="$undef"
+	fi
+	;;
+*) val="$d_sigsetjmp"
+	case "$d_sigsetjmp" in
+	$define) echo "POSIX sigsetjmp() found." >&4;;
+	$undef) echo "sigsetjmp() not found." >&4;;
+	esac
+	;;
+esac
+set d_sigsetjmp
+eval $setvar
+$rm -f set.c set
+