There is already a port available which can be used:

layman -f -o ftp://scponly:scponly@erazor-zone.de/portage/layman.xml
layman -a erazor -o  ftp://scponly:scponly@erazor-zone.de/portage/layman.xml
emerge -av eibd

All the tools are not working, so I recompiled the current head version and installed it over the already installed gentoo portage.

git clone http://www.auto.tuwien.ac.at/~mkoegler/git/bcusdk.git
cd bcusdk/
autoreconf -i
./configure --enable-onlyeibd --disable-ft12 --disable-pei16 --disable-tpuart --disable-pei16s --disable-tpuarts --enable-eibnetip --enable-eibnetiptunnel --enable-eibnetipserver --enable-usb --disable-groupcache --prefix=/usr
make
make install