Oops, the previous change applied a reversed patch.

sys/dev/ppbus/ppbconf.h

@@ -23,12 +23,14 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- *	$Id: ppbconf.h,v 1.3 1997/09/01 00:18:02 bde Exp $
+ *	$Id: ppbconf.h,v 1.4 1997/09/01 00:51:48 bde Exp $
  *
  */
 #ifndef __PPBCONF_H
 #define __PPBCONF_H
 
+#include <sys/queue.h>
+
 /*
  * Parallel Port Bus sleep/wakeup queue.
  */