Build failure of network:osmocom:nightly/osmo-sgsn in Raspbian_9.0/armv7l

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Package network:osmocom:nightly/osmo-sgsn failed to build in Raspbian_9.0/armv7l

Check out the package for editing:
  osc checkout network:osmocom:nightly osmo-sgsn

Last lines of build log:
[  552s]     bss_ptmsi = bss_ptmsi | GSM23003_TMSI_SGSN_MASK;
[  552s]                             ^~~~~~~~~~~~~~~~~~~~~~~
[  552s] gb_proxy.c:246:28: note: each undeclared identifier is reported only once for each function it appears in
[  552s] Makefile:615: recipe for target 'gb_proxy.o' failed
[  552s] make[4]: *** [gb_proxy.o] Error 1
[  552s] make[4]: Leaving directory '/usr/src/packages/BUILD/src/gprs'
[  552s] Makefile:391: recipe for target 'all-recursive' failed
[  552s] make[3]: *** [all-recursive] Error 1
[  552s] make[3]: Leaving directory '/usr/src/packages/BUILD/src'
[  552s] Makefile:453: recipe for target 'all-recursive' failed
[  552s] make[2]: *** [all-recursive] Error 1
[  552s] make[2]: Leaving directory '/usr/src/packages/BUILD'
[  552s] Makefile:385: recipe for target 'all' failed
[  552s] make[1]: *** [all] Error 2
[  552s] make[1]: Leaving directory '/usr/src/packages/BUILD'
[  552s] dh_auto_build: make -j1 returned exit code 2
[  552s] debian/rules:45: recipe for target 'build' failed
[  552s] make: *** [build] Error 2
[  552s] dpkg-buildpackage: error: debian/rules build gave error exit status 2
[  552s] 
[  552s] armbuild21 failed "build osmo-sgsn_1.4.0.28.43f16.dsc" at Fri Jul 12 03:42:56 UTC 2019.
[  552s] 
[  552s] ### VM INTERACTION START ###
[  555s] [  506.848029] sysrq: SysRq : Power Off
[  555s] [  506.850211] reboot: Power down
[  555s] ### VM INTERACTION END ###
[  555s] 
[  555s] armbuild21 failed "build osmo-sgsn_1.4.0.28.43f16.dsc" at Fri Jul 12 03:42:59 UTC 2019.
[  555s] 

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