Hi Sipos, Omar,
You should use the following branches:
libosmocore branch master
libosmo-abis branch master
osmo-trx branch fairwaves/master
osmo-bts branch fairwaves/master ( use ./configure --enable-trx)
openbsc branch fairwaves/master
osmo-pcu branch master (use ./configure --enable-sysmocom-bts )
openggsn branch master
Also if you use the same machine for sgsn, bts and pcu, you should change openbsc.cfg, instead of: gprs nsvc 0 local udp port 23000 gprs nsvc 0 remote udp port 23000 use different ports, for example: gprs nsvc 0 local udp port 5948 gprs nsvc 0 remote udp port 23000