yongpeng2001

I encountered the same issue on Ubuntu 20.04 and found a workaround by running `cmake .. -DCMAKE_BUILD_TYPE:STRING=Release -DCMAKE_C_COMPILER:STRING=clang-12 -DCMAKE_CXX_COMPILER:STRING=clang++-12`. Note that `-G Ninja` and `-DMJPC_BUILD_GRPC_SERVICE:BOOL=ON` are removed. Just a guess,...