ffmpeg-devel @20171210 forbids re-building of opencv @3.2.0_1 on Mac OS X 10.6.8, Snow Leoprad

[ballapete (Peter "Pete" Dyballa)]

opencv @3.2.0_1 was installed when ffmpeg-devel was upgraded to version @20171210. It changed /opt/local/lib/libavcodec.57.108.101.dylib to /opt/local/lib/libavcodec.58.6.103.dylib, so some packages need to be rebuilt:

The following ports will be rebuilt:
 opencv @3.2.0+avx2+eigen+tbb
 libquicktime-devel @1.2.4
 transcode @1.1.7+a52dec+experimental+faac+freetype+full+imagemagick+libdv+libogg+libpostproc+libquicktime+libsdl+libtheora+libvorbis+libxml2+lzo+mjpegtools+x11+x264+xvid

The rebuild of opencv @3.2.0_1` fails with:

[ 61%] Built target opencv_shape
In file included from /opt/local/var/macports/build/_Users_pete_Quellen_MacPorts_graphics_opencv/opencv/work/opencv-3.2.0/modules/videoio/src/cap_ffmpeg.cpp:47:
/opt/local/var/macports/build/_Users_pete_Quellen_MacPorts_graphics_opencv/opencv/work/opencv-3.2.0/modules/videoio/src/cap_ffmpeg_impl.hpp:1541:21: error: use of undeclared identifier 'CODEC_FLAG_GLOBAL_HEADER'
        c->flags |= CODEC_FLAG_GLOBAL_HEADER;
                    ^
/opt/local/var/macports/build/_Users_pete_Quellen_MacPorts_graphics_opencv/opencv/work/opencv-3.2.0/modules/videoio/src/cap_ffmpeg_impl.hpp:1569:30: error: use of undeclared identifier 'AVFMT_RAWPICTURE'
    if (oc->oformat->flags & AVFMT_RAWPICTURE) {
                             ^
/opt/local/var/macports/build/_Users_pete_Quellen_MacPorts_graphics_opencv/opencv/work/opencv-3.2.0/modules/videoio/src/cap_ffmpeg_impl.hpp:1743:35: error: use of undeclared identifier 'AVFMT_RAWPICTURE'
        if( (oc->oformat->flags & AVFMT_RAWPICTURE) == 0 )
                                  ^
/opt/local/var/macports/build/_Users_pete_Quellen_MacPorts_graphics_opencv/opencv/work/opencv-3.2.0/modules/videoio/src/cap_ffmpeg_impl.hpp:2039:32: error: use of undeclared identifier 'AVFMT_RAWPICTURE'
    if (!(oc->oformat->flags & AVFMT_RAWPICTURE)) {
                               ^
/opt/local/var/macports/build/_Users_pete_Quellen_MacPorts_graphics_opencv/opencv/work/opencv-3.2.0/modules/videoio/src/cap_ffmpeg_impl.hpp:2338:25: error: use of undeclared identifier 'CODEC_FLAG_GLOBAL_HEADER'
            c->flags |= CODEC_FLAG_GLOBAL_HEADER;
                        ^
5 errors generated.