FIND_PATH(BoostWinTLS_HEADERS wintls.hpp HINTS "${PROJECT_SOURCE_DIR}/third-party/boost-wintls/include/boost") if(BoostWinTLS_HEADERS) set(BoostWinTLS_INCLUDE "${BoostWinTLS_HEADERS}/..") message(STATUS "Found Boost.WinTLS: ${BoostWinTLS_INCLUDE}") else() message(FATAL_ERROR "Unable to include wintls.hpp") endif()