+ if(NOT TARGET IrrlichtMt::IrrlichtMt)
+ # find_package() searches certain subdirectories. ${PATH}/cmake is not
+ # the only one, but it is the one where IrrlichtMt is supposed to export
+ # IrrlichtMtConfig.cmake
+ message(FATAL_ERROR "Could not find IrrlichtMtConfig.cmake in ${IRRLICHTMT_BUILD_DIR}/cmake.")
+ endif()
+elseif(EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/lib/irrlichtmt")
+ message(STATUS "Using user-provided IrrlichtMt at subdirectory 'lib/irrlichtmt'")
+ if(BUILD_CLIENT)
+ # tell IrrlichtMt to create a static library
+ set(BUILD_SHARED_LIBS OFF CACHE BOOL "Build shared library" FORCE)
+ add_subdirectory(lib/irrlichtmt EXCLUDE_FROM_ALL)
+ unset(BUILD_SHARED_LIBS CACHE)
+
+ if(NOT TARGET IrrlichtMt)
+ message(FATAL_ERROR "IrrlichtMt project is missing a CMake target?!")
+ endif()
+ else()
+ add_library(IrrlichtMt::IrrlichtMt INTERFACE IMPORTED)
+ set_target_properties(IrrlichtMt::IrrlichtMt PROPERTIES
+ INTERFACE_INCLUDE_DIRECTORIES "${CMAKE_CURRENT_SOURCE_DIR}/lib/irrlichtmt/include")