cmake_minimum_required( VERSION 2.8 )

project( elastix )
set(CMAKE_CXX_STANDARD 11)

if( BUILD_SHARED_LIBS )
  message(FATAL_ERROR "Elastix does not support BUILD_SHARED_LIBS")
endif()

#---------------------------------------------------------------------
cmake_policy( SET CMP0012 NEW )
if( POLICY CMP0033 )
  # This policy was introduced in cmake 3, so we need to check for its
  # existence. When the minimum cmake version above is upgraded to 3
  # this if(POLICY) check can be removed.
  cmake_policy( SET CMP0033 OLD )
endif()

cmake_policy( SET CMP0007 OLD )
cmake_policy( SET CMP0042 NEW )

#---------------------------------------------------------------------
# Get version information.

# Get the version number of elastix
file( STRINGS ${elastix_SOURCE_DIR}/Core/Install/elxBaseComponent.h
  ELASTIX_VERSION REGEX "\(#define\ __ELASTIX_VERSION\)" )
string( SUBSTRING ${ELASTIX_VERSION} 26 3 ELASTIX_VERSION )

# Split version in major minor. Assuming no patch number, just x.y
string( REGEX MATCH "[0-9]+" ELASTIX_VERSION_MAJOR "${ELASTIX_VERSION}" )
string( REGEX REPLACE "([0-9]+)\\." "" ELASTIX_VERSION_MINOR "${ELASTIX_VERSION}" )

#---------------------------------------------------------------------
include( CTest )

#---------------------------------------------------------------------
# Generate executable, static library or dynamic library.
mark_as_advanced( ELASTIX_BUILD_EXECUTABLE )
option( ELASTIX_BUILD_EXECUTABLE "Generate executable or library?" ON )

if( NOT ELASTIX_BUILD_EXECUTABLE )

  # The following may make smaller and quicker loading libraries,
  # that hides unnecessary symbols. Available from CMake 3.0.0.
  #set( CMAKE_C_VISIBILITY_PRESET hidden )
  #set( CMAKE_CXX_VISIBILITY_PRESET hidden )

  mark_as_advanced( BUILD_SHARED_LIBS )
  option( BUILD_SHARED_LIBS "Build shared libraries?" OFF )
  if( BUILD_SHARED_LIBS )
    add_definitions( -D_ELASTIX_USE_SHARED_LIBRARY )

    # We need to make sure that also the ITK is compiled with shared
    # libraries on. Related to flag (ITK_)BUILD_SHARED_LIBS. todo

    # In order to compile a shared library, all static sub-libraries
    # need to build position independend code.
    # Otherwise an error similar to the following is raised:
    #   relocation R_X86_64_32S against `.bss' can not be used when
    #   making a shared object; recompile with -fPIC
    set( CMAKE_POSITION_INDEPENDENT_CODE ON )
  endif()
endif()

#---------------------------------------------------------------------
# Find ITK.
find_package( ITK 5.0 REQUIRED )
include( ${ITK_USE_FILE} )

#---------------------------------------------------------------------
# Add the CMake dir as an additional module path,
# so that CMake is able to find the FindPackage modules.
list( APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/CMake )

# Function for exporting targets
include(elastixExportTarget)

#---------------------------------------------------------------------
# Find OpenCL.
option( ELASTIX_USE_OPENCL "Use OpenCL enabled GPU" OFF )

if( ELASTIX_USE_OPENCL )
  find_package( OpenCL REQUIRED QUIET )

  # Make sure ITK is not compiled with GPU extensions on,
  # since elastix overrides ITK classes with new ones.
  if( ${ITK_USE_GPU} )
    message( FATAL_ERROR "ITK_USE_GPU: " ${ITK_USE_GPU}
      "\nERROR: ITK should be compiled with ITK_USE_GPU OFF, as elastix overrides ITK classes." )
  endif()

  # Force OPENCL_OPTIMIZATION_MAD_ENABLE to on
  if( DEFINED OPENCL_OPTIMIZATION_MAD_ENABLE )
    set( OPENCL_OPTIMIZATION_MAD_ENABLE ON CACHE BOOL
      "Allow a * b + c to be replaced by a mad. The mad computes a * b + c with reduced accuracy." FORCE )
  endif()

  # Include the OpenCL include directories to elastix
  include_directories( ${OPENCL_INCLUDE_DIRS} )

  # Add some useful macro's
  include( elastixOpenCL )

  # Add definition for the OpenCL
  add_definitions( -DELASTIX_USE_OPENCL )
endif()

#---------------------------------------------------------------------
# Find Eigen
mark_as_advanced( ELASTIX_USE_EIGEN )
option( ELASTIX_USE_EIGEN "Use Eigen library." OFF )

if( ELASTIX_USE_EIGEN )
  find_package( Eigen3 REQUIRED )
  include_directories( ${EIGEN3_INCLUDE_DIR} )
  add_definitions( -DELASTIX_USE_EIGEN )
endif()

#---------------------------------------------------------------------
# Find OpenMP
mark_as_advanced( ELASTIX_USE_OPENMP )
option( ELASTIX_USE_OPENMP "Use OpenMP to speed up certain computations." ON )

if( ELASTIX_USE_OPENMP )
  find_package( OpenMP QUIET )
  if( OPENMP_FOUND )
    set( CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${OpenMP_C_FLAGS}" )
    set( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OpenMP_CXX_FLAGS}" )
    #  set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS}
    #  ${OpenMP_EXE_LINKER_FLAGS}")
    add_definitions( -DELASTIX_USE_OPENMP )
  endif()
endif()

#----------------------------------------------------------------------
# Check for the SuiteSparse package
# We need to do that here, because the link_directories should be set
# before declaring any targets.

if( USE_PreconditionedGradientDescent )
# ------------------------------------------------------------------
## CMake file to locate SuiteSparse and its useful composite projects
## The first developpement of this file was made fro Windows users who
## use:
##  https://github.com/jlblancoc/suitesparse-metis-for-windows
## Anyway, it chould be work also on linux (tested on fedora 17 when you installed suitesparse from yum)
# Detect SuiteSparse libraries:
# If not found automatically, set SuiteSparse_DIR in CMake to the
# directory where SuiteSparse was built.
# ------------------------------------------------------------------
  list( APPEND CMAKE_MODULE_PATH "${elastix_SOURCE_DIR}/.." ) # Add the directory where FindSuiteSparse.cmake module can be found.

  set( SuiteSparse_USE_LAPACK_BLAS ON )
  find_package( SuiteSparse QUIET NO_MODULE )  # 1st: Try to locate the *config.cmake file.
  if( NOT SuiteSparse_FOUND )
    set( SuiteSparse_VERBOSE ON )
    find_package( SuiteSparse REQUIRED )       # 2nd: Use FindSuiteSparse.cmake module
    include_directories( ${SuiteSparse_INCLUDE_DIRS} )
  else()
    message( STATUS "Find SuiteSparse : include(${USE_SuiteSparse})" )
    include( ${USE_SuiteSparse} )
  endif()
  message( STATUS "SuiteSparse_LIBS: ${SuiteSparse_LIBRARIES}" )
# ------------------------------------------------------------------
#   End of SuiteSparse detection
# ------------------------------------------------------------------
endif()

#---------------------------------------------------------------------
# Set single (build-tree) output directories for all executables and libraries.
# This makes it easier to create an elxUseFile.cmake, that users can
# include in their programs to borrow elastix functionality.

if( NOT LIBRARY_OUTPUT_PATH )
  set( LIBRARY_OUTPUT_PATH ${elastix_BINARY_DIR}/bin CACHE INTERNAL
    "Single output directory for building all libraries." )
endif()

if( NOT EXECUTABLE_OUTPUT_PATH )
  set( EXECUTABLE_OUTPUT_PATH ${elastix_BINARY_DIR}/bin CACHE INTERNAL
    "Single output directory for building all executables." )
endif()

# Mark these variables as advanced; their default value is usually fine
mark_as_advanced( LIBRARY_OUTPUT_PATH EXECUTABLE_OUTPUT_PATH )

#---------------------------------------------------------------------
# Define the install directory names, relative to install prefix
# given by CMAKE_INSTALL_PREFIX.  All components should use the
# same name.  Set as variable here for future customization; e.g.
# if desire to decorate with Elastix version.
# Allow user to customize.

mark_as_advanced( ELASTIX_ARCHIVE_DIR ELASTIX_INCLUDE_DIR ELASTIX_LIBRARY_DIR ELASTIX_RUNTIME_DIR )
set( ELASTIX_ARCHIVE_DIR "lib"      CACHE STRING
  "Directory for installing archive files; path is relative to CMAKE_INSTALL_PREFIX" )
set( ELASTIX_INCLUDE_DIR "include"  CACHE STRING
  "Directory for installing include files; path is relative to CMAKE_INSTALL_PREFIX" )
set( ELASTIX_LIBRARY_DIR "lib"      CACHE STRING
  "Directory for installing library files; path is relative to CMAKE_INSTALL_PREFIX" )
set( ELASTIX_RUNTIME_DIR "bin"      CACHE STRING
  "Directory for installing runtime files; path is relative to CMAKE_INSTALL_PREFIX" )

#---------------------------------------------------------------------
# Check if Mevis DicomTiff support is desired
mark_as_advanced( ELASTIX_USE_MEVISDICOMTIFF )
option( ELASTIX_USE_MEVISDICOMTIFF
  "Support MevisLab DicomTiff image format" OFF )

#---------------------------------------------------------------------
# Define cmake variable to define extra user component directories
# These directories will be added to the list of include directories
# and they will be searched for CMakeLists.txt files for further
# processing. In these directories, users may put code for their own
# components.

mark_as_advanced( ELASTIX_USER_COMPONENT_DIRS )
set( ELASTIX_USER_COMPONENT_DIRS "" CACHE PATH
  "directories with user defined elastix components" )

#---------------------------------------------------------------------
# If IDE supports it, do use folder view.
# gcc automatically ignores it. VC Express does not support and gives
# annoying warnings when this option is turned on.
# VC pro does support it.
set( CMAKE_USE_FOLDERS ON CACHE INTERNAL "Use folder view in IDE" )
if( CMAKE_MAKE_PROGRAM MATCHES ".?VCExpress.?" )
  set( CMAKE_USE_FOLDERS OFF CACHE INTERNAL "Use folder view in IDE" )
endif()
set_property( GLOBAL PROPERTY USE_FOLDERS ${CMAKE_USE_FOLDERS} )

#---------------------------------------------------------------------
# Set default build type to Release, if none was specified
# Taken from ITK CMake list
if( NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES )
  message( STATUS "Setting build type to 'Release' as none was specified." )
  set( CMAKE_BUILD_TYPE Release CACHE STRING "Choose the type of build." FORCE )
  # Set the possible values of build type for cmake-gui
  set_property( CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS
    "Debug" "Release" "MinSizeRel" "RelWithDebInfo" )
endif()

#---------------------------------------------------------------------
# Include directories

set( elxCommon_INCLUDE_DIRECTORIES
  ${elastix_SOURCE_DIR}/Common
  ${elastix_SOURCE_DIR}/Common/CostFunctions
  ${elastix_SOURCE_DIR}/Common/ImageSamplers
  ${elastix_SOURCE_DIR}/Common/LineSearchOptimizers
  ${elastix_SOURCE_DIR}/Common/ParameterFileParser
  ${elastix_SOURCE_DIR}/Common/Transforms
  ${elastix_SOURCE_DIR}/Common/xout
  ${elastix_SOURCE_DIR}/Common/MevisDicomTiff
)

set( elxCommon_OpenCL_INCLUDE_DIRECTORIES
  ${elastix_SOURCE_DIR}/Common/OpenCL
  ${elastix_SOURCE_DIR}/Common/OpenCL/Factories
  ${elastix_SOURCE_DIR}/Common/OpenCL/ITKimprovements
  ${elastix_SOURCE_DIR}/Common/OpenCL/Filters
  ${elastix_SOURCE_DIR}/Common/OpenCL/Kernels
)

set( elxCore_INCLUDE_DIRECTORIES
  ${elastix_SOURCE_DIR}/Core
  ${elastix_SOURCE_DIR}/Core/Install
  ${elastix_SOURCE_DIR}/Core/Kernel
  ${elastix_SOURCE_DIR}/Core/ComponentBaseClasses
  ${elastix_SOURCE_DIR}/Core/Configuration
  ${elastix_SOURCE_DIR}/Core/Main
)

set( elxComponents_INCLUDE_DIRECTORIES
  ${elastix_SOURCE_DIR}/Components/FixedImagePyramids
  ${elastix_SOURCE_DIR}/Components/ImageSamplers
  ${elastix_SOURCE_DIR}/Components/Interpolators
  ${elastix_SOURCE_DIR}/Components/Metrics
  ${elastix_SOURCE_DIR}/Components/MovingImagePyramids
  ${elastix_SOURCE_DIR}/Components/Optimizers
  ${elastix_SOURCE_DIR}/Components/Registrations
  ${elastix_SOURCE_DIR}/Components/ResampleInterpolators
  ${elastix_SOURCE_DIR}/Components/Resamplers
  ${elastix_SOURCE_DIR}/Components/Transforms
)

set( elxINCLUDE_DIRECTORIES
  ${elxCommon_INCLUDE_DIRECTORIES}
  ${elxCore_INCLUDE_DIRECTORIES}
  ${elxComponents_INCLUDE_DIRECTORIES}
  ${elastix_BINARY_DIR}
  ${ELASTIX_USER_COMPONENT_DIRS}
)

include_directories( ${elxINCLUDE_DIRECTORIES} )

# include the OpenCL directories
# The key-word BEFORE is important here, because the elastix distribution
# contains some files with the same name as in the ITK distribution.
# Some bugs were fixed and features added. When these are contributed back
# to the ITK the BEFORE keyword is not needed anymore.
if( ELASTIX_USE_OPENCL )
  include_directories( BEFORE ${elxCommon_OpenCL_INCLUDE_DIRECTORIES} )
endif()

#---------------------------------------------------------------------
# Microsoft specific items

if( MSVC )
  # Kill the anoying MS VS warning about non-safe functions.
  # They hide real warnings.
  add_definitions(
    /D_SCL_SECURE_NO_DEPRECATE
    /D_CRT_SECURE_NO_DEPRECATE
    /D_CRT_TIME_FUNCTIONS_NO_DEPRECATE )

  # Increases address capacity
  if( WIN32 )
    set( CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} /bigobj" )
    set( CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /bigobj" )
    set( CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} /bigobj" )
  endif()
endif()

#---------------------------------------------------------------------
# Process the sub-directories

# Common dir: code that is neither related to the core of elastix or
# to specific components.
add_subdirectory( Common )

# Components: the registration components such as metrics, transforms,
# optimizers, etc.
add_subdirectory( Components )

# Core dir: code that takes care of starting elastix, loading
# components, definitions of macros etc.
add_subdirectory( Core )

#---------------------------------------------------------------------
# Configure the examples

set( ELASTIX_DOX_DIR  ${elastix_SOURCE_DIR}/dox )
set( ELASTIX_TOOLS_DIR  ${elastix_BINARY_DIR}/tools )
set( ELASTIX_HELP_DIR ${elastix_BINARY_DIR}/help CACHE PATH
  "path to the doxygen generated help files and the examples" )

# Copy the examples to the help directory

if( WIN32 )
  configure_file(
    ${ELASTIX_DOX_DIR}/example.bat
    ${ELASTIX_HELP_DIR}/example.bat
    COPYONLY )
else()
  configure_file(
    ${ELASTIX_DOX_DIR}/example
    ${ELASTIX_HELP_DIR}/example
    COPYONLY )
endif()

make_directory( ${ELASTIX_HELP_DIR}/exampleinput )
make_directory( ${ELASTIX_HELP_DIR}/exampleoutput )

set( ELX_EXAMPLEINPUTFILES
  fixed.mhd
  fixed.raw
  mask_fixed.mhd
  mask_fixed.raw
  mask_moving.mhd
  mask_moving.raw
  moving.mhd
  moving.raw
  parameters_Affine.txt
  parameters_BSpline.txt
  parameters_Rigid.txt
  parameters_Translation.txt
  solution_deformedmovingimage.mhd
  solution_deformedmovingimage.raw
)

foreach( ELX_EXAMPLEINPUTFILE ${ELX_EXAMPLEINPUTFILES} )
  configure_file(
    ${ELASTIX_DOX_DIR}/exampleinput/${ELX_EXAMPLEINPUTFILE}
    ${ELASTIX_HELP_DIR}/exampleinput/${ELX_EXAMPLEINPUTFILE}
    COPYONLY )
endforeach()

#---------------------------------------------------------------------
# Configure the doxygen-configuration

option( BUILD_DOCUMENTATION "Build elastix documentation." OFF )

if( ${BUILD_DOCUMENTATION} )
  find_package( Doxygen QUIET )
  string( COMPARE NOTEQUAL ${DOXYGEN} "DOXYGEN-NOTFOUND" Doxygen_FOUND )
  if( Doxygen_FOUND )
    # Set the path to the doxygen configuration source
    set( ELASTIX_DOXYGEN_DIR ${ELASTIX_DOX_DIR}/doxygen )

    # Get the version number of doxygen
    exec_program( ${DOXYGEN} ARGS "--version" OUTPUT_VARIABLE ELASTIX_DOXYGEN_VERSION )

    # Get date
    if( UNIX OR CYGWIN )
      exec_program( "date '+%d-%m-%Y'" OUTPUT_VARIABLE ELASTIX_DOXYGEN_DATE )
    endif()
    if( WIN32 )
      if( NOT CYGWIN AND NOT MINGW )
        execute_process( COMMAND "${ELASTIX_DOXYGEN_DIR}/doxdate.bat"
          OUTPUT_VARIABLE ELASTIX_DOXYGEN_DATETEMP )
        string( REPLACE "/" "-" ELASTIX_DOXYGEN_DATE ${ELASTIX_DOXYGEN_DATETEMP} )
      endif()
    endif()

    # Configure the doxygen configuration
    configure_file(
      ${ELASTIX_DOXYGEN_DIR}/doxyfile.in
      ${ELASTIX_HELP_DIR}/doxyfile.out @ONLY )

    # Configure the footer of the help website.
    configure_file(
      ${ELASTIX_DOXYGEN_DIR}/DoxygenFooter.html.in
      ${ELASTIX_HELP_DIR}/DoxygenFooter.html @ONLY )

    # Configure the MainPage.dox
    configure_file(
      ${ELASTIX_DOXYGEN_DIR}/MainPage.dox.in
      ${ELASTIX_HELP_DIR}/MainPage.dox @ONLY )
  endif()
endif()

#---------------------------------------------------------------------
# Testing

if( BUILD_TESTING )
  add_subdirectory( Testing )
endif()

mark_as_advanced( ELASTIX_USE_GTEST )
option( ELASTIX_USE_GTEST "Use GoogleTest to test Elastix implementation" OFF )

if( ELASTIX_USE_GTEST )
  enable_testing()
  add_subdirectory( Common/GTesting )
  if( NOT ELASTIX_BUILD_EXECUTABLE )
    add_subdirectory( Core/Main/GTesting )
  endif()
endif()

#---------------------------------------------------------------------
# Packaging

mark_as_advanced( ELASTIX_ENABLE_PACKAGER )
option( ELASTIX_ENABLE_PACKAGER "Enable elastix packager using CPack" OFF )

if( ELASTIX_ENABLE_PACKAGER )
  # Version information
  # If the next line is uncommented the package name will be like
  # elastix-4.3-win64 instead of elastix-4.3.0-win64
  #set( CPACK_PACKAGE_VERSION ${ELASTIX_VERSION} )
  set( CPACK_PACKAGE_VERSION_MAJOR ${ELASTIX_VERSION_MAJOR} )
  set( CPACK_PACKAGE_VERSION_MINOR ${ELASTIX_VERSION_MINOR} )
  set( CPACK_PACKAGE_VERSION_PATCH "0" )

  # Also install the copyright file, since when the user enables packaging
  # we assume that the package is meant to distribute.
  install( FILES "${elastix_SOURCE_DIR}/LICENSE" DESTINATION . )
  install( FILES "${elastix_SOURCE_DIR}/NOTICE" DESTINATION . )

  # We have split the elastix package into two components:
  # - the core: elastix and transformix
  # - the libraries: ANNlib
  # NOTE: Currently does not work for nsis. A bug related to this
  # seems to be fixed in the upcoming CMake 2.8.3
  # Therefore, disable component support for now.
  #set( CPACK_COMPONENTS_ALL core libraries Unspecified )
  #  CPACK_ADD_COMPONENT( core
  #  "Core files"
  #  DESCRIPTION "Contains elastix and transformix"
  #  REQUIRED
  #  DEPENDS libraries )
  #   [GROUP group]
  #   [DEPENDS comp1 comp2 ... ]
  #   [INSTALL_TYPES type1 type2 ... ]
  #   [DOWNLOADED]
  #   [ARCHIVE_FILE filename])
  #CPACK_ADD_COMPONENT( libraries
  #  "Libraries"
  #  DESCRIPTION "Contains the libraries"
  #  REQUIRED )
#set( CPACK_COMPONENT_CORE_DISPLAY_NAME "Core files" )
#set( CPACK_COMPONENT_LIBRARIES_DISPLAY_NAME "Libraries" )
#set( CPACK_COMPONENT_CORE_DESCRIPTION "Contains elastix and transformix" )
#set( CPACK_COMPONENT_LIBRARIES_DESCRIPTION "Contains the libraries" )
#set( CPACK_COMPONENT_CORE_DEPENDS libraries )
#set( CPACK_COMPONENT_CORE_REQUIRED ON )
#set( CPACK_COMPONENT_LIBRARIES_REQUIRED ON )

  # The default package filename is
  # ${CPACK_PACKAGE_NAME}-${CPACK_PACKAGE_VERSION}-${CPACK_SYSTEM_NAME}
  # which is like elastix-4.3.0-win64, or elastix-4.3.0-linux-i686
  # Currently however we use elastix_windows64_v4.3
  # We can change our naming schedule or come close to it using:
  #set( CPACK_PACKAGE_FILE_NAME "${CPACK_PACKAGE_NAME}_${CPACK_SYSTEM_NAME}_v${CPACK_PACKAGE_VERSION}" )
  # but it doesn't work since these variables are not defined yet
  # Moving include(CPack) to above introduces other errors.
  #set( CPACK_PACKAGE_FILE_NAME "${PROJECT_NAME}_${CMAKE_SYSTEM_NAME}_v${ELASTIX_VERSION}" )
  # also does not work properly. Just use the default for now.

  # General information
  set( CPACK_PACKAGE_VENDOR "Stefan Klein and Marius Staring" )
  set( CPACK_PACKAGE_DESCRIPTION_SUMMARY
    "elastix is an image registration toolkit" )
  #set( CPACK_PACKAGE_DESCRIPTION_FILE
  #  "${CMAKE_CURRENT_SOURCE_DIR}/ReadMe.txt" )
  set( CPACK_RESOURCE_FILE_LICENSE
    "${CMAKE_CURRENT_SOURCE_DIR}/NOTICE" )

  # The default install directories: .../elastix_v4.3
  set( CPACK_PACKAGE_INSTALL_DIRECTORY
    "elastix_v${ELASTIX_VERSION_MAJOR}.${ELASTIX_VERSION_MINOR}" )
  set( CPACK_PACKAGE_INSTALL_REGISTRY_KEY
    "elastix_v${ELASTIX_VERSION_MAJOR}.${ELASTIX_VERSION_MINOR}" )

  # Do not include a subdirectory in the zip
  set( CPACK_INCLUDE_TOPLEVEL_DIRECTORY 0 )

  set( CPACK_SET_DESTDIR "OFF")

  # Make sure the directory structure is kept in the source zip
  # and that also the dox and tools directories are included.
  set( CPACK_SOURCE_INSTALLED_DIRECTORIES
    "${elastix_SOURCE_DIR};/src;${ELASTIX_DOX_DIR};/dox;${ELASTIX_TOOLS_DIR};/tools" )

  # ??
  #set(CPACK_PACKAGE_EXECUTABLES "MyExecutable" "My Executable")

  # For the windows nsis installer only (is this if-check necessary?)
  if( WIN32 AND NOT UNIX )
    # NOTE: There is a bug in NSI that does not handle full unix paths properly.
    # Make sure there is at least one set of four (4) backlashes
    # (CMake escapes 2, and the other gets escaped too in some second step)

    # Set the generators. If left blank the user has all options.
    set( CPACK_GENERATOR "NSIS;ZIP")

    # Adding information
    set( CPACK_NSIS_DISPLAY_NAME
      "${CPACK_PACKAGE_INSTALL_DIRECTORY} elastix" )
    set( CPACK_NSIS_HELP_LINK "http:\\\\\\\\elastix.isi.uu.nl" )
    set( CPACK_NSIS_URL_INFO_ABOUT "http:\\\\\\\\elastix.isi.uu.nl" )
    set( CPACK_NSIS_CONTACT "elastix@bigr.nl" )
    set( CPACK_NSIS_PACKAGE_NAME "elastix" )
    set( CPACK_NSIS_DISPLAY_NAME "elastix" )

    # Adding icons and images to make it look nice:
    # 1 A branding image that will be displayed inside the installer
    # 2 The icon file(.ico) for the generated install program
    # 3 The icon file(.ico) for the generated uninstall program
    set( CPACK_PACKAGE_ICON
      "${CMAKE_CURRENT_SOURCE_DIR}/dox/art\\\\elastix_logo_full_small.bmp" )
    set( CPACK_NSIS_MUI_ICON
      "${CMAKE_CURRENT_SOURCE_DIR}/dox/art\\\\elastix_logo_64.ico" )
    set( CPACK_NSIS_MUI_UNIICON
      "${CMAKE_CURRENT_SOURCE_DIR}/dox/art\\\\elastix_logo_64.ico" )

    # Create an option in the installer that asks if elastix
    # needs to be added to the system path
    set( CPACK_NSIS_MODIFY_PATH ON )

  else()
    # set the generators
    set( CPACK_GENERATOR "TBZ2;ZIP" )

    # set(CPACK_STRIP_FILES "bin/MyExecutable")
    #set(CPACK_SOURCE_STRIP_FILES "")
  endif()

  # Uncomment the following line if we want to include the system
  # dll's in the distribution!
  #include( InstallRequiredSystemLibraries )

  # This include will do all the work.
  include( CPack )
endif()

#---------------------------------------------------------------------
# Make it easier to include elastix functionality in other programs.

# Save library dependencies.
# The library dependencies file.
set( elxLIBRARY_DEPENDS_FILE ${elastix_BINARY_DIR}/elxLibraryDepends.cmake )
export_library_dependencies( ${elxLIBRARY_DEPENDS_FILE} )

# The build settings file. (necessary for elastix?)
#set( ITK_BUILD_SETTINGS_FILE ${ITK_BINARY_DIR}/ITKBuildSettings.cmake )

elastix_export_target( elastix )
elastix_export_target( transformix )

foreach( LIB IN LISTS AllComponentLibs )
  elastix_export_target( ${LIB} )
endforeach()

configure_file( ${elastix_SOURCE_DIR}/ElastixConfig.cmake.in ${elastix_BINARY_DIR}/ElastixConfig.cmake @ONLY )
configure_file( ${elastix_SOURCE_DIR}/ElastixConfigVersion.cmake.in ${elastix_BINARY_DIR}/ElastixConfigVersion.cmake @ONLY )
configure_file( ${elastix_SOURCE_DIR}/UseElastix.cmake.in ${elastix_BINARY_DIR}/UseElastix.cmake @ONLY )