./configure --prefix=/util/opencv-1.1.0 --with-gtk=yes --with-ffmpeg --without-python --without-quicktime CPPFLAGS="-I/util/libpng/include -I/util/ffmpeg/include" LDFLAGS="-L/util/libpng/lib -L/util/ffmpeg/lib"
Maybe:
./configure --prefix=/util/opencv-1.1.0 --with-gtk --with-ffmpeg --without-python --without-quicktime CFLAGS="-I/util/gtk+/include/gtk-2.0 -I/util/libpng/include -I/util/ffmpeg/include" CPPFLAGS="-I/util/gtk+/include/gtk-2.0 -I/util/libpng/include -I/util/ffmpeg/include" LDFLAGS="-L/util/gtk+/lib -L/util/libpng/lib -L/util/ffmpeg/lib"
Maybe:
./configure --prefix=/util/opencv-1.1.0 --with-gtk --with-gthread --with-ffmpeg --without-python --without-quicktime CFLAGS="-I/util/libpng/include -I/util/ffmpeg/include -I/util/ffmpeg/include/libavcodec -I/util/ffmpeg/include/libavdevice -I/util/ffmpeg/include/libavfilter -I/util/ffmpeg/include/libavformat -I/util/ffmpeg/include/libavutil -I/util/ffmpeg/include/libavpostproc -I/util/ffmpeg/include/libswscale" CPPFLAGS="-I/util/libpng/include -I/util/ffmpeg/include -I/util/ffmpeg/include/libavcodec -I/util/ffmpeg/include/libavdevice -I/util/ffmpeg/include/libavfilter -I/util/ffmpeg/include/libavformat -I/util/ffmpeg/include/libavutil -I/util/ffmpeg/include/libavpostproc -I/util/ffmpeg/include/libswscale" LDFLAGS="-L/util/libpng/lib -L/util/ffmpeg/lib"