The latest build of zlib showed up today and everything compiled just fine. Many thanks to everyone who fixed it. Payam __________________ Payam Minoofar, Ph.D. Scientist Meissner Filtration Products 4181 Calle Tesoro Camarillo, CA 93012 +1 805 388 9911 ext. 159 +1 805 388 5948 fax payam.minoofar at meissner.com