OPTION(THIRDPARTY_BUILD_BOOST "Build Boost libraries" OFF)
SET(Boost_USE_MULTITHREADED ON CACHE BOOL
    "Search for multithreaded boost libraries")
MARK_AS_ADVANCED(Boost_USE_MULTITHREADED)

IF (THIRDPARTY_BUILD_BOOST)
    INCLUDE(ExternalProject)
   
    IF (NOT WIN32)
        # Only build the libraries we need
        SET(BOOST_LIB_LIST --with-system --with-iostreams --with-filesystem 
                           --with-program_options --with-date_time --with-thread
                           --with-regex)
                           
        # We need -fPIC for 64-bit builds
        IF( CMAKE_SYSTEM_PROCESSOR STREQUAL "x86_64" )
            SET(BOOST_FLAGS cxxflags=-fPIC cflags=-fPIC linkflags=-fPIC)
        ENDIF ()
        
        # Build Boost
        IF (APPLE)
            SET(TOOLSET darwin)
        ELSE(APPLE)
            SET(TOOLSET gcc)
        ENDIF(APPLE)
        EXTERNALPROJECT_ADD(
            boost
            PREFIX ${TPSRC}
            URL ${TPURL}/boost_1_49_0.tar.bz2
            URL_MD5 "0d202cb811f934282dea64856a175698"
            DOWNLOAD_DIR ${TPSRC}
            CONFIGURE_COMMAND CC=${CMAKE_C_COMPILER} CXX=${CMAKE_CXX_COMPILER} ./bootstrap.sh --prefix=${TPSRC}/dist
            BUILD_COMMAND NO_BZIP2=1 ./b2
                            variant=release
                            link=shared 
                            include=${TPSRC}/dist/include
                            linkflags="-L${TPSRC}/dist/lib"
                            ${BOOST_FLAGS} ${BOOST_LIB_LIST} 
                            --layout=system toolset=${TOOLSET} install
            INSTALL_COMMAND ""
            BUILD_IN_SOURCE 1
        )
    
        # If building ThirdParty zlib, force zlib build before boost
        IF (THIRDPARTY_BUILD_ZLIB)
             ADD_DEPENDENCIES(boost zlib-1.2.7)
        ENDIF(THIRDPARTY_BUILD_ZLIB)

        # Set up CMake variables
        SET(Boost_DATE_TIME_LIBRARY boost_date_time)
        SET(Boost_DATE_TIME_LIBRARY_DEBUG boost_date_time)
        SET(Boost_DATE_TIME_LIBRARY_RELEASE boost_date_time)
        SET(Boost_FILESYSTEM_LIBRARY boost_filesystem)
        SET(Boost_FILESYSTEM_LIBRARY_DEBUG boost_filesystem)
        SET(Boost_FILESYSTEM_LIBRARY_RELEASE boost_filesystem)
        SET(Boost_IOSTREAMS_LIBRARY boost_iostreams)
        SET(Boost_IOSTREAMS_LIBRARY_DEBUG boost_iostreams)
        SET(Boost_IOSTREAMS_LIBRARY_RELEASE boost_iostreams)
        SET(Boost_PROGRAM_OPTIONS_LIBRARY boost_program_options)
        SET(Boost_PROGRAM_OPTIONS_LIBRARY_DEBUG boost_program_options)
        SET(Boost_PROGRAM_OPTIONS_LIBRARY_RELEASE boost_program_options)
        SET(Boost_REGEX_LIBRARY boost_regex)
        SET(Boost_REGEX_LIBRARY_DEBUG boost_regex)
        SET(Boost_REGEX_LIBRARY_RELEASE boost_regex)
        SET(Boost_SYSTEM_LIBRARY boost_system)
        SET(Boost_SYSTEM_LIBRARY_DEBUG boost_system)
        SET(Boost_SYSTEM_LIBRARY_RELEASE boost_system)
        SET(Boost_THREAD_LIBRARY boost_thread)
        SET(Boost_THREAD_LIBRARY_DEBUG boost_thread)
        SET(Boost_THREAD_LIBRARY_RELEASE boost_thread)
        SET(Boost_INCLUDE_DIRS ${TPSRC}/dist/include 
                               ${TPSRC}/dist/include/boost-1_49)
        SET(Boost_LIBRARY_DIRS ${TPSRC}/dist/lib)
        LINK_DIRECTORIES(${Boost_LIBRARY_DIRS})
    ELSE ()
        EXTERNALPROJECT_ADD(
            boost
            PREFIX ${TPSRC}
            URL ${TPURL}/boost_1_49_0.tar.bz2
            URL_MD5 "0d202cb811f934282dea64856a175698"
            DOWNLOAD_DIR ${TPSRC}
            CONFIGURE_COMMAND bootstrap.bat --prefix=${TPSRC}/boost
            BUILD_COMMAND b2 --layout=system install
            INSTALL_COMMAND ""
            BUILD_IN_SOURCE 1
        )
    ENDIF ()
ELSE (THIRDPARTY_BUILD_BOOST)
    SET(Boost_DEBUG 0)
    SET(Boost_NO_BOOST_CMAKE ON)
    #If the user has not set BOOST_ROOT, look in a couple common places first.
    IF( NOT BOOST_ROOT )
        SET(TEST_ENV1 $ENV{BOOST_HOME})
        SET(TEST_ENV2 $ENV{BOOST_DIR})
        IF (DEFINED TEST_ENV1)
            SET(BOOST_ROOT $ENV{BOOST_HOME})
            FIND_PACKAGE( Boost QUIET COMPONENTS thread iostreams date_time
                filesystem system program_options regex )
        ELSEIF (DEFINED TEST_ENV2)
            SET(BOOST_ROOT $ENV{BOOST_DIR})
            FIND_PACKAGE( Boost QUIET COMPONENTS thread iostreams date_time
                filesystem system program_options regex )
        ELSE ()
            SET(BOOST_ROOT ${CMAKE_SOURCE_DIR}/ThirdParty/boost)
            FIND_PACKAGE( Boost QUIET COMPONENTS thread iostreams date_time filesystem system program_options regex)
            SET(BOOST_ROOT ${CMAKE_SOURCE_DIR}/../ThirdParty/boost)
            FIND_PACKAGE( Boost QUIET COMPONENTS thread iostreams date_time filesystem system program_options regex)
            SET(BOOST_ROOT ${CMAKE_SOURCE_DIR}/ThirdParty/dist)
            FIND_PACKAGE( Boost QUIET COMPONENTS thread iostreams date_time filesystem system program_options regex)
        ENDIF()
    ELSE()
        FIND_PACKAGE( Boost COMPONENTS thread iostreams zlib date_time filesystem system program_options regex)
    ENDIF()
    IF (Boost_IOSTREAMS_FOUND)
        MESSAGE(STATUS "Found Boost iostreams library: ${Boost_IOSTREAMS_LIBRARY}")
    ENDIF ()
    IF (Boost_THREAD_FOUND)
        MESSAGE(STATUS "Found Boost thread library: ${Boost_THREAD_LIBRARY}")
    ENDIF ()
    IF (Boost_DATE_TIME_FOUND)
        MESSAGE(STATUS "Found Boost date_time library: ${Boost_DATE_TIME_LIBRARY}")
    ENDIF ()
    IF (Boost_FILESYSTEM_FOUND)
        MESSAGE(STATUS "Found Boost filesystem library: ${Boost_FILESYSTEM_LIBRARY}")
    ENDIF ()
    IF (Boost_SYSTEM_FOUND)
        MESSAGE(STATUS "Found Boost system library: ${Boost_SYSTEM_LIBRARY}")
    ENDIF ()
    IF (Boost_PROGRAM_OPTIONS_FOUND)
        MESSAGE(STATUS "Found Boost program_options library: ${Boost_PROGRAM_OPTIONS_LIBRARY}")
    ENDIF ()
    IF (Boost_REGEX_FOUND)
        MESSAGE(STATUS "Found Boost regex library: ${Boost_REGEX_LIBRARY}")
    ENDIF ()
ENDIF (THIRDPARTY_BUILD_BOOST)

INCLUDE_DIRECTORIES(SYSTEM ${Boost_INCLUDE_DIRS})