Resolve Issues

update cmake

help

1. wget https://cmake.org/files/v3.12/cmake-3.12.4.tar.gz
2. tar -xvzf cmake-3.12.4.tar.gz
3. cd cmake-3.12.4
4. ./configure
5. make
6. sudo make install
7. sudo update-alternatives --install /usr/bin/cmake cmake /usr/local/bin/cmake 1 --force
8. cmake --version

Update gcc

1. sudo add-apt-repository ppa:ubuntu-toolchain-r/test
2. sudo apt update
3. sudo apt install gcc-6
4. sudo apt install g++-6
5. sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-6 60 --slave /usr/bin/g++ g++ /usr/bin/g++-6