echo "$ac_t""$ac_cv_cygwin" 1>&6
	    if test "$ac_cv_cygwin" = "no"; then
		{ echo "configure: error: ${CC} is not a cygwin compiler." 1>&2; exit 1; }
	    fi
	    if test "x${TCL_THREADS}" = "x0"; then
		{ echo "configure: error: CYGWIN compile is only supported with --enable-threads" 1>&2; exit 1; }
	    fi
	    if test ! -f "../win/tcldde12.dll" -a ! -f "../win/tk84.dll"; then
	    if test "x${SHARED_BUILD}" = "x1" -a ! -f "../win/tcldde12.dll" -a ! -f "../win/tk84.dll"; then
		{ echo "configure: error: Please configure and make the ../win directory first." 1>&2; exit 1; }
	    fi
	    ;;
	dgux*)
	    SHLIB_CFLAGS="-K PIC"
	    SHLIB_LD='${CC} -G'
	    SHLIB_LD_LIBS=""