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This isn't actually needed, because there is no CMakeLists.txt file in tests directory
"CMake Warning (dev) at CMakeLists.txt:229 (add_subdirectory):
The source directory
/tmp/build/websocketpp/test
does not contain a CMakeLists.txt file.
CMake does not support this case but it used to work accidentally and is
being allowed for compatibility.
Policy CMP0014 is not set: Input directories must have CMakeLists.txt. Run
"cmake --help-policy CMP0014" for policy details. Use the cmake_policy
command to set the policy and suppress this warning.
This warning is for project developers. Use -Wno-dev to suppress it."