Debian seems compiled client module with fixed configurations,

338 ./configure --with-linux=$(KSRC_TREE) \
339 --with-linux-obj=$(KSRC) \
340 --disable-server \
341 --disable-quilt \
342 --disable-dependency-tracking \
343 --disable-doc \
344 --disable-utils \
345 --disable-iokit \
346 --disable-snmp \
347 --disable-tests \
348 --enable-quota \

if users want to make debian package with external IB, it won't work.