libmobile.a(mncc_sock.o) undefined reference

Dear All,   I am having following error during ‘make’ osmocombb:   libmobile.a(mncc_sock.o): In function `mncc_sock_accept': /home/ubuntu/Desktop/OsmocomBB/master/src/host/layer23/src/mobile/mncc_sock.c:229: undefined reference to `osmo_fd_read_disable' libmobile.a(mncc_sock.o): In function `mncc_sock_close': /home/ubuntu/Desktop/OsmocomBB/master/src/host/layer23/src/mobile/mncc_sock.c:95: undefined reference to `osmo_fd_read_enable' libmobile.a(mncc_sock.o): In function `mncc_sock_write': /home/ubuntu/Desktop/OsmocomBB/master/src/host/layer23/src/mobile/mncc_sock.c:159: undefined reference to `osmo_fd_write_disable' /home/ubuntu/Desktop/OsmocomBB/master/src/host/layer23/src/mobile/mncc_sock.c:174: undefined reference to `osmo_fd_write_enable' libmobile.a(mncc_sock.o): In function `mncc_sock_from_cc': /home/ubuntu/Desktop/OsmocomBB/master/src/host/layer23/src/mobile/mncc_sock.c:75: undefined reference to `osmo_fd_write_enable' libmobile.a(mncc_sock.o): In function `mncc_sock_write_pending': /home/ubuntu/Desktop/OsmocomBB/master/src/host/layer23/src/mobile/mncc_sock.c:81: undefined reference to `osmo_fd_write_enable' collect2: error: ld returned 1 exit status Makefile:394: recipe for target 'mobile' failed make[3]: *** [mobile] Error 1 make[3]: Leaving directory '/home/ubuntu/Desktop/OsmocomBB/master/src/host/layer23/src/mobile' Makefile:325: recipe for target 'all-recursive' failed make[2]: *** [all-recursive] Error 1 make[2]: Leaving directory '/home/ubuntu/Desktop/OsmocomBB/master/src/host/layer23/src' Makefile:351: recipe for target 'all-recursive' failed make[1]: *** [all-recursive] Error 1 make[1]: Leaving directory '/home/ubuntu/Desktop/OsmocomBB/master/src/host/layer23' Makefile:97: recipe for target 'host/layer23/layer23' failed make: *** [host/layer23/layer23] Error 2         My arm-elf-gcc is gcc version 4.5.2 (GCC) libosmocore 1.4.1     I believe it is something with libraries but could not figure out ….   -- Mario Lucas