g++ gateway.pb.o gateway.grpc.pb.o main.o -L/usr/local/lib `pkg-config --libs grpc++ grpc` -Wl,--no-as-needed -lgrpc++_reflection -Wl,--as-needed -lprotobuf -lpthread -ldl -lwiringPi -lm -o gateway
/usr/bin/ld: /usr/local/lib/libwiringPi.a(softPwm.o): undefined reference to symbol 'pthread_cancel@@GLIBC_2.2.5'
/lib/x86_64-linux-gnu/libpthread.so.0: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
Makefile:14: recipe for target 'gateway' failed
make: *** [gateway] Error 1