CXX      libbitcoinc_server_a-validation.o
  CXX      libbitcoinc_server_a-validationinterface.o
g++: internal compiler error: Killed (program cc1plus)
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-5/README.Bugs> for instructions.
Makefile:7281: recipe for target 'libbitcoinc_server_a-validation.o' failed
make[3]: *** [libbitcoinc_server_a-validation.o] Error 4
make[3]: *** Waiting for unfinished jobs....
In file included from ./primitives/transaction.h:15:0,
                 from ./validationinterface.h:9,
                 from validationinterface.cpp:6:
./consensus/consensus.h:27:21: warning: ‘MIN_TRANSACTION_WEIGHT’ defined but not used [-Wunused-variable]
 static const size_t MIN_TRANSACTION_WEIGHT = WITNESS_SCALE_FACTOR * 60; // 60 is the lower bound for the size of a valid serialized CTransaction
                     ^
In file included from ./primitives/transaction.h:15:0,
                 from ./validationinterface.h:9,
                 from validationinterface.cpp:6:
./consensus/consensus.h:28:21: warning: ‘MIN_SERIALIZABLE_TRANSACTION_WEIGHT’ defined but not used [-Wunused-variable]
 static const size_t MIN_SERIALIZABLE_TRANSACTION_WEIGHT = WITNESS_SCALE_FACTOR * 10; // 10 is the lower bound for the size of a serialized CTransaction
                     ^
make[3]: Leaving directory '/root/parts/bitcoinc-project/build/src'
Makefile:11585: recipe for target 'all-recursive' failed
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory '/root/parts/bitcoinc-project/build/src'
Makefile:3395: recipe for target 'all' failed
make[1]: *** [all] Error 2
make[1]: Leaving directory '/root/parts/bitcoinc-project/build/src'
Makefile:796: recipe for target 'all-recursive' failed
make: *** [all-recursive] Error 1
Failed to run 'make -j2' for 'bitcoinc-project': Exited with code 2.
Verify that the part is using the correct parameters and try again.
Run the same command again with --debug to shell into the environment if you wish to introspect this failure.
An error occurred when trying to execute 'sudo -i env SNAPCRAFT_HAS_TTY=True snapcraft snap' with 'multipass': returned exit code 2.