Unable to build layer23/src/mobile

Hi I am trying to build osmocombb on Ubuntu 18.04 with GCC-4.9 & arm-elf-gcc-4.5.2, I am getting the following error, how do I fix this issued. Making all in mobilemake[3]: Entering directory '/root/trx/src/host/layer23/src/mobile'  CCLD     mobilelibmobile.a(gsm322.o): In function `memset':/usr/include/x86_64-linux-gnu/bits/string_fortified.h:67: undefined reference to `__warn_memset_zero_len'collect2: error: ld returned 1 exit statusMakefile:379: recipe for target 'mobile' failedmake[3]: *** [mobile] Error 1make[3]: Leaving directory '/root/trx/src/host/layer23/src/mobile'Makefile:325: recipe for target 'all-recursive' failedmake[2]: *** [all-recursive] Error 1make[2]: Leaving directory '/root/trx/src/host/layer23/src'Makefile:350: recipe for target 'all-recursive' failedmake[1]: *** [all-recursive] Error 1make[1]: Leaving directory '/root/trx/src/host/layer23'Makefile:51: recipe for target 'layer23' failedmake: *** [layer23] Error 2 Regards Babar Ali