if (STATIC_BUILD OR NOT USE_SYSTEM_BOOST)
  set(BOOST_STATIC 1)
else()
  include(FindBoost)

  set(BOOST_STATIC 0)
  #set(Boost_DEBUG 1)
  #set(Boost_USE_STATIC_LIBS ON)

  if (ENABLE_LOCALE)
    list(APPEND ORTHANC_BOOST_COMPONENTS locale)
  endif()

  list(APPEND ORTHANC_BOOST_COMPONENTS filesystem thread system date_time regex)
  find_package(Boost COMPONENTS ${ORTHANC_BOOST_COMPONENTS})

  if (NOT Boost_FOUND)
    foreach (item ${ORTHANC_BOOST_COMPONENTS})
      string(TOUPPER ${item} tmp)

      if (Boost_${tmp}_FOUND)
        set(tmp2 "found")
      else()
        set(tmp2 "missing")
      endif()
      
      message("Boost component ${item} - ${tmp2}")
    endforeach()
    
    message(FATAL_ERROR "Unable to locate Boost on this system")
  endif()

  
  # Patch by xnox to fix issue #166 (CMake find_boost version is now
  # broken with newer boost/cmake)
  # https://bitbucket.org/sjodogne/orthanc/issues/166/
  if (POLICY CMP0093)
    set(BOOST144 1.44)
  else()
    set(BOOST144 104400)
  endif()
  
  
  # Boost releases 1.44 through 1.47 supply both V2 and V3 filesystem
  # http://www.boost.org/doc/libs/1_46_1/libs/filesystem/v3/doc/index.htm
  if (${Boost_VERSION} LESS ${BOOST144})
    add_definitions(
      -DBOOST_HAS_FILESYSTEM_V3=0
      )
  else()
    add_definitions(
      -DBOOST_HAS_FILESYSTEM_V3=1
      -DBOOST_FILESYSTEM_VERSION=3
      )
  endif()

  include_directories(${Boost_INCLUDE_DIRS})
  link_libraries(${Boost_LIBRARIES})
endif()


if (BOOST_STATIC)
  ##
  ## Parameters for static compilation of Boost 
  ##
  
  set(BOOST_NAME boost_1_69_0)
  set(BOOST_VERSION 1.69.0)
  set(BOOST_BCP_SUFFIX bcpdigest-1.5.6)
  set(BOOST_MD5 "579bccc0ea4d1a261c1d0c5e27446c3d")
  set(BOOST_URL "http://orthanc.osimis.io/ThirdPartyDownloads/${BOOST_NAME}_${BOOST_BCP_SUFFIX}.tar.gz")
  set(BOOST_SOURCES_DIR ${CMAKE_BINARY_DIR}/${BOOST_NAME})

  if (IS_DIRECTORY "${BOOST_SOURCES_DIR}")
    set(FirstRun OFF)
  else()
    set(FirstRun ON)
  endif()

  DownloadPackage(${BOOST_MD5} ${BOOST_URL} "${BOOST_SOURCES_DIR}")


  ##
  ## Patching boost
  ## 

  execute_process(
    COMMAND ${PATCH_EXECUTABLE} -p0 -N -i
    ${ORTHANC_ROOT}/Resources/Patches/boost-${BOOST_VERSION}-linux-standard-base.patch
    WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
    RESULT_VARIABLE Failure
    )

  if (FirstRun AND Failure)
    message(FATAL_ERROR "Error while patching a file")
  endif()


  ##
  ## Generic configuration of Boost
  ## 

  if (CMAKE_COMPILER_IS_GNUCXX)
    add_definitions(-isystem ${BOOST_SOURCES_DIR})
  endif()

  include_directories(
    BEFORE ${BOOST_SOURCES_DIR}
    )

  add_definitions(
    # Static build of Boost
    -DBOOST_ALL_NO_LIB 
    -DBOOST_ALL_NOLIB 
    -DBOOST_DATE_TIME_NO_LIB 
    -DBOOST_THREAD_BUILD_LIB
    -DBOOST_PROGRAM_OPTIONS_NO_LIB
    -DBOOST_REGEX_NO_LIB
    -DBOOST_SYSTEM_NO_LIB
    -DBOOST_LOCALE_NO_LIB

    # In static builds, explicitly prevent Boost from using the system
    # locale in lexical casts. This is notably important if
    # "boost::lexical_cast<double>()" is applied to strings containing
    # "," instead of "." as decimal separators. Check out function
    # "OrthancStone::LinearAlgebra::ParseVector()".
    -DBOOST_LEXICAL_CAST_ASSUME_C_LOCALE
    )

  set(BOOST_SOURCES
    ${BOOST_SOURCES_DIR}/libs/system/src/error_code.cpp
    )

  if ("${CMAKE_SYSTEM_VERSION}" STREQUAL "LinuxStandardBase" OR
      "${CMAKE_SYSTEM_NAME}" STREQUAL "Android")
    add_definitions(
      -DBOOST_SYSTEM_USE_STRERROR=1
      )
  endif()

  
  ##
  ## Configuration of boost::thread
  ##
  
  if (CMAKE_SYSTEM_NAME STREQUAL "Linux" OR
      CMAKE_SYSTEM_NAME STREQUAL "Darwin" OR
      CMAKE_SYSTEM_NAME STREQUAL "FreeBSD" OR
      CMAKE_SYSTEM_NAME STREQUAL "kFreeBSD" OR
      CMAKE_SYSTEM_NAME STREQUAL "OpenBSD" OR
      CMAKE_SYSTEM_NAME STREQUAL "PNaCl" OR
      CMAKE_SYSTEM_NAME STREQUAL "NaCl32" OR
      CMAKE_SYSTEM_NAME STREQUAL "NaCl64" OR
      CMAKE_SYSTEM_NAME STREQUAL "Android")
    list(APPEND BOOST_SOURCES
      ${BOOST_SOURCES_DIR}/libs/atomic/src/lockpool.cpp
      ${BOOST_SOURCES_DIR}/libs/thread/src/pthread/once.cpp
      ${BOOST_SOURCES_DIR}/libs/thread/src/pthread/thread.cpp
      )

    if ("${CMAKE_SYSTEM_VERSION}" STREQUAL "LinuxStandardBase" OR
        CMAKE_SYSTEM_NAME STREQUAL "PNaCl" OR
        CMAKE_SYSTEM_NAME STREQUAL "NaCl32" OR
        CMAKE_SYSTEM_NAME STREQUAL "NaCl64")
      add_definitions(-DBOOST_HAS_SCHED_YIELD=1)
    endif()

    # Fix for error: "boost_1_69_0/boost/chrono/detail/inlined/mac/thread_clock.hpp:54:28: 
    # error: use of undeclared identifier 'pthread_mach_thread_np'"
    # https://github.com/envoyproxy/envoy/pull/1785
    if (CMAKE_SYSTEM_NAME STREQUAL "Darwin")
      add_definitions(-D_DARWIN_C_SOURCE=1)
    endif()

  elseif(CMAKE_SYSTEM_NAME STREQUAL "Windows")
    list(APPEND BOOST_SOURCES
      ${BOOST_SOURCES_DIR}/libs/thread/src/win32/tss_dll.cpp
      ${BOOST_SOURCES_DIR}/libs/thread/src/win32/thread.cpp
      ${BOOST_SOURCES_DIR}/libs/thread/src/win32/tss_pe.cpp
      )

  elseif (CMAKE_SYSTEM_NAME STREQUAL "Emscripten")
    # No support for threads in asm.js/WebAssembly

  else()
    message(FATAL_ERROR "Support your platform here")
  endif()


  ##
  ## Configuration of boost::regex
  ##
  
  aux_source_directory(${BOOST_SOURCES_DIR}/libs/regex/src BOOST_REGEX_SOURCES)

  list(APPEND BOOST_SOURCES
    ${BOOST_REGEX_SOURCES}
    )


  ##
  ## Configuration of boost::datetime
  ##
  
  list(APPEND BOOST_SOURCES
    ${BOOST_SOURCES_DIR}/libs/date_time/src/gregorian/greg_month.cpp
    )


  ##
  ## Configuration of boost::filesystem
  ## 

  if (CMAKE_SYSTEM_NAME STREQUAL "PNaCl" OR
      CMAKE_SYSTEM_NAME STREQUAL "NaCl32" OR
      CMAKE_SYSTEM_NAME STREQUAL "NaCl64" OR
      CMAKE_SYSTEM_NAME STREQUAL "Android")
    # boost::filesystem is not available on PNaCl
    add_definitions(
      -DBOOST_HAS_FILESYSTEM_V3=0
      -D__INTEGRITY=1
      )
  else()
    add_definitions(
      -DBOOST_HAS_FILESYSTEM_V3=1
      )
    list(APPEND BOOST_SOURCES
      ${BOOST_NAME}/libs/filesystem/src/codecvt_error_category.cpp
      ${BOOST_NAME}/libs/filesystem/src/operations.cpp
      ${BOOST_NAME}/libs/filesystem/src/path.cpp
      ${BOOST_NAME}/libs/filesystem/src/path_traits.cpp
      )

    if (CMAKE_SYSTEM_NAME STREQUAL "Darwin" OR
        CMAKE_SYSTEM_NAME STREQUAL "OpenBSD" OR
        CMAKE_SYSTEM_NAME STREQUAL "FreeBSD")
     list(APPEND BOOST_SOURCES
        ${BOOST_SOURCES_DIR}/libs/filesystem/src/utf8_codecvt_facet.cpp
        )

    elseif (CMAKE_SYSTEM_NAME STREQUAL "Windows")
      list(APPEND BOOST_SOURCES
        ${BOOST_NAME}/libs/filesystem/src/windows_file_codecvt.cpp
        )
    endif()
  endif()


  ##
  ## Configuration of boost::locale
  ## 

  if (NOT ENABLE_LOCALE)
    message("boost::locale is disabled")
  else()
    set(BOOST_ICU_SOURCES
      ${BOOST_SOURCES_DIR}/libs/locale/src/icu/boundary.cpp
      ${BOOST_SOURCES_DIR}/libs/locale/src/icu/codecvt.cpp
      ${BOOST_SOURCES_DIR}/libs/locale/src/icu/collator.cpp
      ${BOOST_SOURCES_DIR}/libs/locale/src/icu/conversion.cpp
      ${BOOST_SOURCES_DIR}/libs/locale/src/icu/date_time.cpp
      ${BOOST_SOURCES_DIR}/libs/locale/src/icu/formatter.cpp
      ${BOOST_SOURCES_DIR}/libs/locale/src/icu/icu_backend.cpp
      ${BOOST_SOURCES_DIR}/libs/locale/src/icu/numeric.cpp
      ${BOOST_SOURCES_DIR}/libs/locale/src/icu/time_zone.cpp
      )

    list(APPEND BOOST_SOURCES
      ${BOOST_SOURCES_DIR}/libs/locale/src/encoding/codepage.cpp
      ${BOOST_SOURCES_DIR}/libs/locale/src/shared/generator.cpp
      ${BOOST_SOURCES_DIR}/libs/locale/src/shared/date_time.cpp
      ${BOOST_SOURCES_DIR}/libs/locale/src/shared/formatting.cpp
      ${BOOST_SOURCES_DIR}/libs/locale/src/shared/ids.cpp
      ${BOOST_SOURCES_DIR}/libs/locale/src/shared/localization_backend.cpp
      ${BOOST_SOURCES_DIR}/libs/locale/src/shared/message.cpp
      ${BOOST_SOURCES_DIR}/libs/locale/src/shared/mo_lambda.cpp
      ${BOOST_SOURCES_DIR}/libs/locale/src/util/codecvt_converter.cpp
      ${BOOST_SOURCES_DIR}/libs/locale/src/util/default_locale.cpp
      ${BOOST_SOURCES_DIR}/libs/locale/src/util/gregorian.cpp
      ${BOOST_SOURCES_DIR}/libs/locale/src/util/info.cpp
      ${BOOST_SOURCES_DIR}/libs/locale/src/util/locale_data.cpp
      )        

    if (CMAKE_SYSTEM_NAME STREQUAL "OpenBSD" OR
        CMAKE_SYSTEM_VERSION STREQUAL "LinuxStandardBase")
      add_definitions(
        -DBOOST_LOCALE_NO_WINAPI_BACKEND=1
        -DBOOST_LOCALE_NO_POSIX_BACKEND=1
        )
      
      list(APPEND BOOST_SOURCES
        ${BOOST_SOURCES_DIR}/libs/locale/src/std/codecvt.cpp
        ${BOOST_SOURCES_DIR}/libs/locale/src/std/collate.cpp
        ${BOOST_SOURCES_DIR}/libs/locale/src/std/converter.cpp
        ${BOOST_SOURCES_DIR}/libs/locale/src/std/numeric.cpp
        ${BOOST_SOURCES_DIR}/libs/locale/src/std/std_backend.cpp
        )

      if (BOOST_LOCALE_BACKEND STREQUAL "gcc" OR
          BOOST_LOCALE_BACKEND STREQUAL "libiconv")
        add_definitions(-DBOOST_LOCALE_WITH_ICONV=1)
      elseif (BOOST_LOCALE_BACKEND STREQUAL "icu")
        add_definitions(-DBOOST_LOCALE_WITH_ICU=1)
        list(APPEND BOOST_SOURCES ${BOOST_ICU_SOURCES})
      else()
        message(FATAL_ERROR "Unsupported value for BOOST_LOCALE_BACKEND: ${BOOST_LOCALE_BACKEND}")
      endif()

    elseif (CMAKE_SYSTEM_NAME STREQUAL "Linux" OR
            CMAKE_SYSTEM_NAME STREQUAL "Darwin" OR
            CMAKE_SYSTEM_NAME STREQUAL "FreeBSD" OR
            CMAKE_SYSTEM_NAME STREQUAL "kFreeBSD" OR
            CMAKE_SYSTEM_NAME STREQUAL "PNaCl" OR
            CMAKE_SYSTEM_NAME STREQUAL "NaCl32" OR
            CMAKE_SYSTEM_NAME STREQUAL "NaCl64" OR
            CMAKE_SYSTEM_NAME STREQUAL "Emscripten") # For WebAssembly or asm.js
      add_definitions(
        -DBOOST_LOCALE_NO_WINAPI_BACKEND=1
        -DBOOST_LOCALE_NO_STD_BACKEND=1
        )
      
      list(APPEND BOOST_SOURCES
        ${BOOST_SOURCES_DIR}/libs/locale/src/posix/codecvt.cpp
        ${BOOST_SOURCES_DIR}/libs/locale/src/posix/collate.cpp
        ${BOOST_SOURCES_DIR}/libs/locale/src/posix/converter.cpp
        ${BOOST_SOURCES_DIR}/libs/locale/src/posix/numeric.cpp
        ${BOOST_SOURCES_DIR}/libs/locale/src/posix/posix_backend.cpp
        )

      if (CMAKE_SYSTEM_NAME STREQUAL "Emscripten" OR
          BOOST_LOCALE_BACKEND STREQUAL "gcc" OR
          BOOST_LOCALE_BACKEND STREQUAL "libiconv")
        # In WebAssembly or asm.js, we rely on the version of iconv
        # that is shipped with the stdlib
        add_definitions(-DBOOST_LOCALE_WITH_ICONV=1)
      elseif (BOOST_LOCALE_BACKEND STREQUAL "icu")
        add_definitions(-DBOOST_LOCALE_WITH_ICU=1)
        list(APPEND BOOST_SOURCES ${BOOST_ICU_SOURCES})
      else()
        message(FATAL_ERROR "Unsupported value for BOOST_LOCALE_BACKEND: ${BOOST_LOCALE_BACKEND}")
      endif()

    elseif (CMAKE_SYSTEM_NAME STREQUAL "Windows")
      add_definitions(
        -DBOOST_LOCALE_NO_POSIX_BACKEND=1
        -DBOOST_LOCALE_NO_STD_BACKEND=1
        )

      list(APPEND BOOST_SOURCES
        ${BOOST_SOURCES_DIR}/libs/locale/src/win32/collate.cpp
        ${BOOST_SOURCES_DIR}/libs/locale/src/win32/converter.cpp
        ${BOOST_SOURCES_DIR}/libs/locale/src/win32/lcid.cpp
        ${BOOST_SOURCES_DIR}/libs/locale/src/win32/numeric.cpp
        ${BOOST_SOURCES_DIR}/libs/locale/src/win32/win_backend.cpp
        )

      # Starting with release 0.8.2, Orthanc statically links against
      # libiconv on Windows. Indeed, the "WCONV" library of Windows XP
      # seems not to support properly several codepages (notably
      # "Latin3", "Hebrew", and "Arabic"). Set "BOOST_LOCALE_BACKEND"
      # to "wconv" to use WCONV anyway.

      if (BOOST_LOCALE_BACKEND STREQUAL "libiconv")
        add_definitions(-DBOOST_LOCALE_WITH_ICONV=1)
      elseif (BOOST_LOCALE_BACKEND STREQUAL "icu")
        add_definitions(-DBOOST_LOCALE_WITH_ICU=1)
        list(APPEND BOOST_SOURCES ${BOOST_ICU_SOURCES})
      elseif (BOOST_LOCALE_BACKEND STREQUAL "wconv")
        message("Using Window's wconv")
        add_definitions(-DBOOST_LOCALE_WITH_WCONV=1)
      else()
        message(FATAL_ERROR "Unsupported value for BOOST_LOCALE_BACKEND on Windows: ${BOOST_LOCALE_BACKEND}")
      endif()

    else()
      message(FATAL_ERROR "Support your platform here")
    endif()
  endif()

  
  source_group(ThirdParty\\boost REGULAR_EXPRESSION ${BOOST_SOURCES_DIR}/.*)

endif()