message: Fix missing header file in install directory
diff: @@ -187,6 +187,8 @@ add_library(libcaf_core "${PROJECT_SOURCE_DIR}/cmake/dummy.cpp"
  caf_core_set_default_properties(libcaf_core_obj libcaf_core)
  caf_export_and_install_lib(core)
  +install(FILES "${CMAKE_BINARY_DIR}/caf/detail/build_config.hpp"
  + DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/caf/detail")
  # -- build unit tests ----------------------------------------------------------
  