Compling pb with Ubuntu 11.04 64 bits

Hi all I'll upgrade a Ubuntu 11.04 64 bits to 11.10 and it seems something was wrong. Now I have reinstall an "old" Ubuntu 11.04 64 bits from scratch and the compile process is fairly better but I obtain this failure : apps/hello_world/main.o: In function `console_rx_cb': apps/hello_world/main.c:59: undefined reference to `msgb_free' comm/libcomm.a(sercomm.o): In function `sercomm_alloc_msgb': ../../shared/libosmocore/include/osmocom/core/msgb.h:330: undefined reference to `msgb_alloc' comm/libcomm.a(sercomm.o): In function `sercomm_drv_rx_char': comm/sercomm.c:246: undefined reference to `msgb_free' comm/libcomm.a(sercomm.o): In function `dispatch_rx_msg': comm/sercomm.c:227: undefined reference to `msgb_free' comm/libcomm.a(sercomm.o): In function `sercomm_drv_pull': comm/sercomm.c:161: undefined reference to `msgb_dequeue' comm/sercomm.c:188: undefined reference to `msgb_free' comm/libcomm.a(sercomm.o): In function `sercomm_sendmsg': comm/sercomm.c:125: undefined reference to `msgb_enqueue' comm/libcomm.a(sercomm_cons.o): In function `msgb_alloc_headroom': ../../shared/libosmocore/include/osmocom/core/msgb.h:330: undefined reference to `msgb_alloc' make[1]: *** [board/compal_e88/hello_world.compalram.elf] error 1 make[1]: Leaving directory `/srv/osmocom-bb/src/target/firmware' make: *** [firmware] error 2 Any idea Regards