/usr/include/ableton/platforms/ is in ableton-link-dev 1.0.0+dfsg-2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/ableton/platforms/Config.hpp
/usr/include/ableton/platforms/asio/
/usr/include/ableton/platforms/asio/AsioService.hpp
/usr/include/ableton/platforms/asio/AsioTimer.hpp
/usr/include/ableton/platforms/asio/AsioWrapper.hpp
/usr/include/ableton/platforms/asio/Context.hpp
/usr/include/ableton/platforms/asio/PooledHandlerContext.hpp
/usr/include/ableton/platforms/asio/Socket.hpp
/usr/include/ableton/platforms/asio/Util.hpp
/usr/include/ableton/platforms/darwin/
/usr/include/ableton/platforms/darwin/Clock.hpp
/usr/include/ableton/platforms/darwin/Darwin.hpp
/usr/include/ableton/platforms/linux/
/usr/include/ableton/platforms/linux/Linux.hpp
/usr/include/ableton/platforms/posix/
/usr/include/ableton/platforms/posix/ScanIpIfAddrs.hpp
/usr/include/ableton/platforms/stl/
/usr/include/ableton/platforms/stl/Clock.hpp
/usr/include/ableton/platforms/windows/
/usr/include/ableton/platforms/windows/Clock.hpp
/usr/include/ableton/platforms/windows/ScanIpIfAddrs.hpp