Средства и методы разработки

https://docs.github.com/en/authentication/connecting-to-github-with-ssh/generating-a-new-ssh-key-and-adding-it-to-the-ssh-agent

в) Установить ключ в свою учётку ГитХаба. Теперь гитхаб пасёт, что и когда я у него стянул...

Чекаут libs/qt-ads прошёл успешно. Но дальше, при первом вызове симэйка,

/protodb$ cmake ./ -B ./build -DBUILD_EXAMPLES:BOOL=OFF -DBUILD_STATIC:BOOL=ON
-- The C compiler identification is GNU 8.3.0
-- The CXX compiler identification is GNU 8.3.0
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Performing Test COMPILER_HAS_HIDDEN_VISIBILITY
-- Performing Test COMPILER_HAS_HIDDEN_VISIBILITY - Success
-- Performing Test COMPILER_HAS_HIDDEN_INLINE_VISIBILITY
-- Performing Test COMPILER_HAS_HIDDEN_INLINE_VISIBILITY - Success
-- Performing Test COMPILER_HAS_DEPRECATED_ATTR
-- Performing Test COMPILER_HAS_DEPRECATED_ATTR - Success
-- Generating install for base
-- Generating install for gui
-- Generating install for dev
-- Found Lua: /usr/lib/x86_64-linux-gnu/liblua5.3.so;/usr/lib/x86_64-linux-gnu/libm.so (found version "5.3.3")
-- Generating install for protodb
-- Generating install for NetIoWidget
-- Generating install for NetIoDevice
-- Generating install for SerialIoWidget lib
-- Generating install for SerialIoDevice
-- Generating install for LuaScriptInterface
CMake Error at documentation/CMakeLists.txt:67 (target_sources):
target_sources called with non-compilable target type
-- Generating install for docs
-- Configuring incomplete, errors occurred!
See also "~/protodb/build/CMakeFiles/CMakeOutput.log".