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missing mbuf_len at load time

I'm building an ethernet controller device driver that needs to implement outputPacket(), overloaded from IONetworkController.  In order to manipulate the packet pointed to by mbuf_t *, I've invoked mbuf_len to check the length of the data.  xcode can find the declaration in kpi_mbuf.h, but the linker can't find it at kext load time.  I'm running 10.4.10, which has worked fine until now.  By the message, the linker is expecting c++ linkage: __Z8mbuf_lenP6__mbuf

Thanks in advance, Chris

snippet...

UInt32
xgg::outputPacket( mbuf_t packet, void * param )
{
size_t mlen = mbuf_len(packet);
IOLog("xgg::outputPacket mbuf data len %d\n", mlen);

return kIOReturnSuccess;
}

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