if (${STATIC_BUILD})
  SET(LIBPNG_SOURCES_DIR ${CMAKE_BINARY_DIR}/libpng-1.5.12)
  DownloadPackage("http://download.sourceforge.net/libpng/libpng-1.5.12.tar.gz" "${LIBPNG_SOURCES_DIR}" "${LIBPNG_PRELOADED}" "")

  include_directories(
    ${LIBPNG_SOURCES_DIR}
    )

  configure_file(
    ${LIBPNG_SOURCES_DIR}/scripts/pnglibconf.h.prebuilt
    ${LIBPNG_SOURCES_DIR}/pnglibconf.h
    COPY_ONLY)

  set(LIBPNG_SOURCES
    #${LIBPNG_SOURCES_DIR}/example.c
    ${LIBPNG_SOURCES_DIR}/png.c
    ${LIBPNG_SOURCES_DIR}/pngerror.c
    ${LIBPNG_SOURCES_DIR}/pngget.c
    ${LIBPNG_SOURCES_DIR}/pngmem.c
    ${LIBPNG_SOURCES_DIR}/pngpread.c
    ${LIBPNG_SOURCES_DIR}/pngread.c
    ${LIBPNG_SOURCES_DIR}/pngrio.c
    ${LIBPNG_SOURCES_DIR}/pngrtran.c
    ${LIBPNG_SOURCES_DIR}/pngrutil.c
    ${LIBPNG_SOURCES_DIR}/pngset.c
    #${LIBPNG_SOURCES_DIR}/pngtest.c
    ${LIBPNG_SOURCES_DIR}/pngtrans.c
    ${LIBPNG_SOURCES_DIR}/pngwio.c
    ${LIBPNG_SOURCES_DIR}/pngwrite.c
    ${LIBPNG_SOURCES_DIR}/pngwtran.c
    ${LIBPNG_SOURCES_DIR}/pngwutil.c
    )

  #set_property(
  #  SOURCE ${LIBPNG_SOURCES}
  #  PROPERTY COMPILE_FLAGS -UHAVE_CONFIG_H)

  list(APPEND THIRD_PARTY_SOURCES ${LIBPNG_SOURCES})

  add_definitions(
    -DPNG_NO_CONSOLE_IO=1
    -DPNG_NO_STDIO=1
    )

else()
  include(FindPNG)

  if (NOT ${PNG_FOUND})
    message(FATAL_ERROR "Unable to find LibPNG")
  endif()

  include_directories(${PNG_INCLUDE_DIRS})
  link_libraries(${PNG_LIBRARIES})
  add_definitions(${PNG_DEFINITIONS})
endif()