I installed the following packages:apsfilter, lprng, lprngtool and downloaded cZ11.tar.gz from http://www.kornblum.i-p.com/Z11/LexmarkZ11.html, after make and make install the cZ11 driver, I use lprngtool to setup printer, but lprngtool says there're 2 unrecongnizable printerafters. what shold I do to solve this problem?