games/traingame: unbreak with boost 1.69
CMake Error at /usr/local/share/cmake/Modules/FindBoost.cmake:2049 (message):
Unable to find the requested Boost libraries. Boost version: 1.69.0 Boost include path: /usr/local/include Could not find the following Boost libraries: boost_signals Some (but not all) of the required Boost libraries were found. You may need to install these additional Boost libraries. Alternatively, set BOOST_LIBRARYDIR to the directory containing Boost libraries or BOOST_ROOT to the location of Boost.
Call Stack (most recent call first):
CMakeLists.txt:40 (find_package)
PR: 232525