Question

I am using NetBeans 7.0.1 to develop C++ applications using OpenCV 2.4.0 on Ubuntu 11.10. When I try to build the application I get the following link error messages.

undefined reference to `cvCreateSubdivDelaunay2D(CvRect, CvMemStorage*)'
undefined reference to `cvSubdivDelaunay2DInsert(CvSubdiv2D*, cv::Point_<int>)'

I have linked to the following libraries.

libopencv_calib3d_pch_dephelp.a
libopencv_calib3d.so
libopencv_calib3d.so.2.4
libopencv_calib3d.so.2.4.0
libopencv_contrib_pch_dephelp.a
libopencv_contrib.so
libopencv_contrib.so.2.4
libopencv_contrib.so.2.4.0
libopencv_core_pch_dephelp.a
libopencv_core.so
libopencv_core.so.2.4
libopencv_core.so.2.4.0
libopencv_features2d_pch_dephelp.a
libopencv_features2d.so
libopencv_features2d.so.2.4
libopencv_features2d.so.2.4.0
libopencv_flann_pch_dephelp.a
libopencv_flann.so
libopencv_flann.so.2.4
libopencv_flann.so.2.4.0
libopencv_gpu_pch_dephelp.a
libopencv_gpu.so
libopencv_gpu.so.2.4
libopencv_gpu.so.2.4.0
libopencv_haartraining_engine.a
libopencv_highgui_pch_dephelp.a
libopencv_highgui.so
libopencv_highgui.so.2.4
libopencv_highgui.so.2.4.0
libopencv_imgproc_pch_dephelp.a
libopencv_imgproc.so
libopencv_imgproc.so.2.4
libopencv_imgproc.so.2.4.0
libopencv_legacy_pch_dephelp.a
libopencv_legacy.so
libopencv_legacy.so.2.4
libopencv_legacy.so.2.4.0
libopencv_ml_pch_dephelp.a
libopencv_ml.so
libopencv_ml.so.2.4
libopencv_ml.so.2.4.0
libopencv_nonfree_pch_dephelp.a
libopencv_nonfree.so
libopencv_nonfree.so.2.4
libopencv_nonfree.so.2.4.0
libopencv_objdetect_pch_dephelp.a
libopencv_objdetect.so
libopencv_objdetect.so.2.4
libopencv_objdetect.so.2.4.0
libopencv_perf_calib3d_pch_dephelp.a
libopencv_perf_core_pch_dephelp.a
libopencv_perf_features2d_pch_dephelp.a
libopencv_perf_gpu_pch_dephelp.a
libopencv_perf_highgui_pch_dephelp.a
libopencv_perf_imgproc_pch_dephelp.a
libopencv_perf_nonfree_pch_dephelp.a
libopencv_perf_objdetect_pch_dephelp.a
libopencv_perf_photo_pch_dephelp.a
libopencv_perf_stitching_pch_dephelp.a
libopencv_perf_video_pch_dephelp.a
libopencv_photo_pch_dephelp.a
libopencv_photo.so
libopencv_photo.so.2.4
libopencv_photo.so.2.4.0
libopencv_stitching_pch_dephelp.a
libopencv_stitching.so
libopencv_stitching.so.2.4
libopencv_stitching.so.2.4.0
libopencv_test_calib3d_pch_dephelp.a
libopencv_test_contrib_pch_dephelp.a
libopencv_test_core_pch_dephelp.a
libopencv_test_features2d_pch_dephelp.a
libopencv_test_highgui_pch_dephelp.a
libopencv_test_imgproc_pch_dephelp.a
libopencv_test_legacy_pch_dephelp.a
libopencv_test_ml_pch_dephelp.a
libopencv_test_nonfree_pch_dephelp.a
libopencv_test_objdetect_pch_dephelp.a
libopencv_test_photo_pch_dephelp.a
libopencv_test_stitching_pch_dephelp.a
libopencv_test_video_pch_dephelp.a
libopencv_ts_pch_dephelp.a
libopencv_ts.so
libopencv_ts.so.2.4
libopencv_ts.so.2.4.0
libopencv_video_pch_dephelp.a
libopencv_video.so
libopencv_video.so.2.4
libopencv_video.so.2.4.0
libopencv_videostab_pch_dephelp.a
libopencv_videostab.so
libopencv_videostab.so.2.4
libopencv_videostab.so.2.4.0
libraries.txt

I would be most grateful is someone could tell me how to resolve this error.

Many thanks in advance,
Peter.

Answer 1

In 2.4.0, cvSubdivDelaunay2DInsert is in libopencv_legacy.so, and so should cvCreateSubdivDelaunay2D according to the source code, but the latest wasn’t found in the library compiled on Mac OS X.

To verify this info, go to OpenCV libraries directory and execute nm. If the result appears with the letter T before the symbol name it means that’s the library that implements the symbol:

$ nm libopencv_legacy.so | grep cvSubdivDelaunay2DInsert    
00000000000b5200 T _cvSubdivDelaunay2DInsert

If you can’t find cvCreateSubdivDelaunay2D using this trick, consider filing a bug.