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Requires cmake: https://cmake.org/download/
apt-get install cmake
sudo apt-get install libavdevice-dev libavformat-dev libgd2-noxpm libgd2-noxpm-dev
no clang++
This fixes the first error:
sudo apt-get install clang-3.5 llvm
sudo ln -s /usr/bin/clang-3.5 /usr/bin/clang sudo ln -s /usr/bin/clang++-3.5 /usr/bin/clang++
sudo apt-get install libswscale-dev
apt-get install libxml-dev
https://git.gnome.org/browse/libxml2/
required for building libxml2 sudo apt-get install libtool sudo apt-get install autoconf Then: ln -s /usr/local/include/libxml2 /usr/include/libxml2
sudo apt-get install python-dev
sudo apt-get install libxslt1-dev