MAVSDK C++ is a library that can be installed and then used in your C++ code.
The latest release can be installed using prebuilt artefacts. If you need the latest state or want to debug the library itself, you need to build it from source.
Ubuntu: Download the .deb file for your system from MAVSDK releases and install it using
sudo dpkg -i mavsdk_0.37.0_ubuntu20.04_amd64.deb
Fedora: Download the .rpm file for your system from MAVSDK releases and install it using
sudo rpm -U mavsdk-0.37.0-1.fc33-x86_64.rpm
yay -S mavsdk
MacOS: Install Homebrew and use it to install the library:
brew install mavsdk
For Windows you can download the mavsdk-windows-x64-release.zip file from MAVSDK releases containing the headers and library and extract it locally (see information how to use a locally installed library).
As the library is installed locally (in a local directory) you need to point cmake to that directory at configure time using
CMAKE_PREFIX_PATHwhen building your application. i.e.:
cmake -Bbuild -DCMAKE_PREFIX_PATH=../mavsdk_extracted-H.