PROJECT(HelloWorld)

cmake_minimum_required(VERSION 2.8)

SET(FETCH_ITK ON CACHE BOOL "Fetch ITK")

if(FETCH_ITK)
    #Use External Project module to do some magic!
    include(ExternalProject)

    ExternalProject_Add(ITK
    PREFIX "itk-v"
    GIT_REPOSITORY git://itk.org/ITK.git
    GIT_TAG "v4.0.0"
    #CMAKE_ARGS -DCMAKE_INSTALL_PREFIX:PATH=INSTALL_DIR !!!! DOESN'T WORK, so skip install
    CMAKE_CACHE_ARGS -DBUILD_EXAMPLES:BOOL=OFF -DBUILD_TESTING:BOOL=OFF -DBUILD_SHARED_LIBS:BOOL=ON -DCMAKE_BUILD_TYPE:STRING=Debug
    BUILD_IN_SOURCE 0
    INSTALL_COMMAND ""
    )

    ExternalProject_Get_Property(ITK BINARY_DIR)
    #Use build directory of ITK from now on
    SET(ITK_DIR ${BINARY_DIR} CACHE)
endif()

    #Hello world example

    FIND_PACKAGE(ITK)

    IF(ITK_FOUND)
        INCLUDE(${ITK_USE_FILE})
    ELSE(ITK_FOUND)
        MESSAGE(FATAL_ERROR
        "ITK not found. Please set ITK_DIR.")
    ENDIF(ITK_FOUND)

    ADD_EXECUTABLE(HelloWorld hello.cxx )
    TARGET_LINK_LIBRARIES(HelloWorld ITKCommon)

IF(FETCH_ITK)
    add_dependencies(HelloWorld ITK)
ENDIF()