I have this driver install on my system
with Slackware 10 and i get the asterisk source from CVS

====DRIVER===
vpb: major = 254
s[3] = V 0x56 s[2] = 4 0x34
check_region ret = 0
vpb: Manufactured 04/08/2003
vpb: Card version 20.02
vpb: Serial number 33201200
VPB: Reg28= 70440422
1 V4PCI's detected on PCI bus
===============

I compile zaptel, libpri with no error but the asterisk source printe this error

===Compile Error====
/usr/include/pthread.h: In function `int unload_module()':
/usr/include/pthread.h:395: error: too many arguments to function `int
   pthread_cond_destroy(pthread_cond_t*)'
chan_vpb.c:2107: error: at this point in file
chan_vpb.c: At top level:
chan_vpb.c:113: warning: `VPB_DETECT toned_grunt' defined but not used
make[1]: *** [chan_vpb.o] Error 1
make[1]: Leaving directory `/usr/src/asterisk/channels'
make: *** [subdirs] Error 1
========================