if (NOT ENABLE_LOCALE)
  message("Support for locales is disabled")

elseif (NOT USE_BOOST_ICONV)
  message("Not using libiconv")

else()
  message("Using libiconv")

  if (STATIC_BUILD OR NOT USE_SYSTEM_LIBICONV)
    set(LIBICONV_SOURCES_DIR ${CMAKE_BINARY_DIR}/libiconv-1.15)
    set(LIBICONV_URL "http://orthanc.osimis.io/ThirdPartyDownloads/libiconv-1.15.tar.gz")
    set(LIBICONV_MD5 "ace8b5f2db42f7b3b3057585e80d9808")

    DownloadPackage(${LIBICONV_MD5} ${LIBICONV_URL} "${LIBICONV_SOURCES_DIR}")

    # Disable the support of libiconv that is shipped by default with
    # the C standard library on Linux. Setting this macro redirects
    # calls from "iconv*()" to "libiconv*()" by defining macros in the
    # C headers of "libiconv-1.15".
    add_definitions(-DLIBICONV_PLUG=1)

    # https://groups.google.com/d/msg/android-ndk/AS1nkxnk6m4/EQm09hD1tigJ
    add_definitions(
      -DBUILDING_LIBICONV=1
      -DIN_LIBRARY=1
      -DLIBDIR=""
      -DICONV_CONST=
      )

    configure_file(
      ${LIBICONV_SOURCES_DIR}/srclib/localcharset.h
      ${LIBICONV_SOURCES_DIR}/include
      COPYONLY)

    set(HAVE_VISIBILITY 0)
    set(ICONV_CONST ${ICONV_CONST})
    set(USE_MBSTATE_T 1)
    set(BROKEN_WCHAR_H 0)
    set(EILSEQ)
    set(HAVE_WCHAR_T 1)
    configure_file(
      ${LIBICONV_SOURCES_DIR}/include/iconv.h.build.in
      ${LIBICONV_SOURCES_DIR}/include/iconv.h
      )
    unset(HAVE_VISIBILITY)
    unset(ICONV_CONST)
    unset(USE_MBSTATE_T)
    unset(BROKEN_WCHAR_H)
    unset(EILSEQ)
    unset(HAVE_WCHAR_T)

    if (NOT EXISTS ${LIBICONV_SOURCES_DIR}/include/config.h)
      # Create an empty "config.h" for libiconv
      file(WRITE ${LIBICONV_SOURCES_DIR}/include/config.h "")
    endif()

    include_directories(
      ${LIBICONV_SOURCES_DIR}/include
      )

    set(LIBICONV_SOURCES
      ${LIBICONV_SOURCES_DIR}/lib/iconv.c  
      ${LIBICONV_SOURCES_DIR}/lib/relocatable.c
      ${LIBICONV_SOURCES_DIR}/libcharset/lib/localcharset.c  
      ${LIBICONV_SOURCES_DIR}/libcharset/lib/relocatable.c
      )

    source_group(ThirdParty\\libiconv REGULAR_EXPRESSION ${LIBICONV_SOURCES_DIR}/.*)

    if (CMAKE_SYSTEM_NAME STREQUAL "Windows")
      add_definitions(-DHAVE_WORKING_O_NOFOLLOW=0)
    else()
      add_definitions(-DHAVE_WORKING_O_NOFOLLOW=1)
    endif()

  else() 
    CHECK_INCLUDE_FILE_CXX(iconv.h HAVE_ICONV_H)
    if (NOT HAVE_ICONV_H)
      message(FATAL_ERROR "Please install the libiconv-dev package")
    endif()

    # Check whether the support for libiconv is bundled within the
    # standard C library
    CHECK_FUNCTION_EXISTS(iconv_open HAVE_ICONV_LIB)
    if (NOT HAVE_ICONV_LIB)
      # No builtin support for libiconv, try and find an external library.
      # Open question: Does this make sense on any platform?
      CHECK_LIBRARY_EXISTS(iconv iconv_open "" HAVE_ICONV_LIB_2)
      if (NOT HAVE_ICONV_LIB_2)
        message(FATAL_ERROR "Please install the libiconv-dev package")
      else()
        link_libraries(iconv)
      endif()
    endif()

  endif()
endif()