How about trying to do what the original error message is suggesting? https://cmake.org/cmake/help/latest/policy/CMP0072.html
Try this line: OpenGL_GL_PREFERENCE=LEGACY -- https://code.launchpad.net/~widelands-dev/widelands/cmakepolicy/+merge/356018 Your team Widelands Developers is subscribed to branch lp:~widelands-dev/widelands/cmakepolicy. _______________________________________________ Mailing list: https://launchpad.net/~widelands-dev Post to : widelands-dev@lists.launchpad.net Unsubscribe : https://launchpad.net/~widelands-dev More help : https://help.launchpad.net/ListHelp
