LibPNG + Boost :: GIL: png_infopp_NULL не найден

Question

Я всегда получаю эту ошибку при попытке скомпилировать мой файл с поддержкой Boost :: GIL PNG IO:

(у меня Mac OS X Leopard и Boost 1.42, LibPNG 1.4)

/usr/local/include/boost/gil/extension/io/png_io_private.hpp: In member function 'void boost::gil::detail::png_reader::init()':
/usr/local/include/boost/gil/extension/io/png_io_private.hpp:155: error: 'png_infopp_NULL' was not declared in this scope
/usr/local/include/boost/gil/extension/io/png_io_private.hpp:160: error: 'png_infopp_NULL' was not declared in this scope
/usr/local/include/boost/gil/extension/io/png_io_private.hpp: In destructor 'boost::gil::detail::png_reader::~png_reader()':
/usr/local/include/boost/gil/extension/io/png_io_private.hpp:174: error: 'png_infopp_NULL' was not declared in this scope
/usr/local/include/boost/gil/extension/io/png_io_private.hpp: In member function 'void boost::gil::detail::png_reader::apply(const View&)':
/usr/local/include/boost/gil/extension/io/png_io_private.hpp:186: error: 'int_p_NULL' was not declared in this scope
/usr/local/include/boost/gil/extension/io/png_io_private.hpp: In member function 'void boost::gil::detail::png_reader_color_convert<CC>::apply(const View&)':
/usr/local/include/boost/gil/extension/io/png_io_private.hpp:228: error: 'int_p_NULL' was not declared in this scope
/usr/local/include/boost/gil/extension/io/png_io_private.hpp: In member function 'void boost::gil::detail::png_writer::init()':
/usr/local/include/boost/gil/extension/io/png_io_private.hpp:317: error: 'png_infopp_NULL' was not declared in this scope

Answer 1

libpng 1.4 исключил определения png_infopp_NULL и int_p_NULL. Так что добавь

#define png_infopp_NULL (png_infopp)NULL
#define int_p_NULL (int*)NULL

в вашем коде перед включением заголовков GIL.

Answer 2

Изначально я использовал libpng 1.4. Я перешел на версию 1.2 и все проблемы ушли.