Handle being made a subproject

CMakeLists.txt

@@ -11,6 +11,10 @@ project(WiiUse)
 # Set up options
 ###
 
+if(NOT CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
+	set(SUBPROJECT YES)
+endif()
+
 include("./ParseVersion.cmake")
 message(STATUS "Configuring WiiUse version ${CPACK_PACKAGE_VERSION}")
 
@@ -57,6 +61,7 @@ endif()
 # The lib is in the "src" subdirectory
 add_subdirectory(src)
 
+if(NOT SUBPROJECT)
 	# Example apps
 	if(BUILD_EXAMPLE)
 		add_subdirectory(example)
@@ -65,8 +70,17 @@ endif()
 	if(BUILD_EXAMPLE_SDL)
 		add_subdirectory(example-sdl)
 	endif()
+endif()
 
+if(SUBPROJECT)
+	set(WIIUSE_INCLUDE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/src" PARENT_SCOPE)
+	set(WIIUSE_INCLUDE_DIRS "${CMAKE_CURRENT_SOURCE_DIR}/src" PARENT_SCOPE)
+	set(WIIUSE_LIBRARY wiiuse PARENT_SCOPE)
+	set(WIIUSE_LIBRARIES wiiuse PARENT_SCOPE)
+	set(WIIUSE_FOUND ON PARENT_SCOPE)
+endif()
 
+if(NOT SUBPROJECT)
 ###
 # Set packaging options (for CPack)
 ###
@@ -118,3 +132,4 @@ cpack_add_component(examples
 	cpack_add_component(runtime
 		DISPLAY_NAME "Runtime Library"
 		REQUIRED)
+endif()