multicast panic

I'm trying to compile a multicast application and the system panics every 
time I run configure:

Oct 14 13:46:11 groggy su: dave to root on /dev/ttyp0


Fatal trap 12: page fault while in kernel mode
fault virtual address   = 0x68
fault code              = supervisor read, page not present
instruction pointer     = 0x8:0xc053ddd2
stack pointer           = 0x10:0xc9241bd4
frame pointer           = 0x10:0xc9241be4
code segment            = base 0x0, limit 0xfffff, type 0x1b
                         = DPL 0, pres 1, def32 1, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 1143 (conftest)
kernel: type 12 trap, code=0
Stopped at      _mtx_lock_sleep+0x192:  movl    0x68(%ecx),%edx
db> trace
_mtx_lock_sleep(c075a580,0,0,0) at _mtx_lock_sleep+0x192
get_sg_cnt(c9241c60) at get_sg_cnt+0x34
X_mrt_ioctl(c0147210,c9241c60,c9241c34,c056d632,c0147210) at X_mrt_ioctl+0x2e
rtioctl(c0147210,c9241c60,0,c0147210,c9241cec) at rtioctl+0x18
soo_ioctl(c1cebbf4,c0147210,c9241c60,c1deb380,c1cbfe40) at soo_ioctl+0x152
ioctl(c1cbfe40,c9241d14,3,0,206) at ioctl+0x4be
syscall(2f,2f,2f,bfbffa88,bfbffa74) at syscall+0x27b
Xint0x80_syscall() at Xint0x80_syscall+0x1d
--- syscall (54, FreeBSD ELF32, ioctl), eip = 0x280be37f, esp = 0xbfbffa5c, 
ebp = 0xbfbffaac ---
db>