首先安装cmake:
 sudo apt install cmake
 cmake --version然后这个输出正常就装好了
然后安装ffmpeg:
   tar xvzf n4.4.tar.gz
   cd FFmpeg-n4.4
   chmod +x configure
   ./configure --enable-gpl --enable-nonfree --enable-libx264 --enable-debug --disable-optimizations --enable-shared --enable-pthreads --enable-version3 --extra-cflags=-I/usr/local/include --extra-ldflags=-L/usr/local/lib
   make -j16 (-j16的作用是快一点,多核处理)
   sudo make install
不成功的话,加一个环境变量:sudo gedit /etc/profile
然后安装libssh:
 tar xvf libssh-0.8.7.tar.xz
 cd libssh-0.8.7
 mkdir build
 cd build
 cmake ..
 make
 sudo make install
不成功的话:
把之前的clean:make clean
  安装libtool: sudo apt-get install libtool
sudo apt-get install libssh-dev