CODEWITHSUNDEEP
opencvubuntucmake
user1066325
user1066325

Reputation: 1

Compiling a project based on OpenCV and ROS in Ubuntu

I am receiving an error when running CMake (actually rosmake) on my project. I have already installed OpenCV, but I get the following error: 

Linking CXX shared library ../lib/libCornerHelper.so
  /usr/bin/ld: cannot find -lopencv_contrib
  /usr/bin/ld: cannot find -lopencv_legacy
  /usr/bin/ld: cannot find -lopencv_stitching
  /usr/bin/ld: cannot find -lopencv_gpu
  /usr/bin/ld: cannot find -lopencv_objdetect
  /usr/bin/ld: cannot find -lopencv_calib3d
  /usr/bin/ld: cannot find -lopencv_features2d
  /usr/bin/ld: cannot find -lopencv_video
  /usr/bin/ld: cannot find -lopencv_highgui
  /usr/bin/ld: cannot find -lopencv_ml
  /usr/bin/ld: cannot find -lopencv_imgproc
  /usr/bin/ld: cannot find -lopencv_flann
  /usr/bin/ld: cannot find -lopencv_core
  collect2: ld returned 1 exit status
  make[3]: *** [../lib/libCornerHelper.so] Error 1

Does anyone know how to solve this?

Upvotes: 0

Views: 2326

Answers (2)

Eric Perko
Eric Perko

Reputation: 1026

If you are using OpenCV in ROS, the appropriate link flags and paths should be picked up automatically if you have declared a dependency on opencv2 in your manifest.xml file.

If you are still having issues, I suggest you search ROS Answers and, if you don't find anything, ask your question there. That is the official ROS support forum and will likely get you a better answer to ROS specific problems than StackOverflow.

Upvotes: 0

Sam Felix
Sam Felix

Reputation: 1321

Apparently, he could not find opencv to link against your project. Did you install it in somewhere else other than /usr or /usr/local?

If so, you need to add the path to LD_LIBRARY_PATH variable and so on. What does your system say when you run this?

pkg-config --cflags --libs opencv

If you get something like this, then your system is ok.

-I/opt/opencv/include/opencv -I/opt/opencv/include  -L/opt/opencv/lib -lopencv_core -lopencv_imgproc -lopencv_highgui -lopencv_ml -lopencv_video -lopencv_features2d -lopencv_calib3d -lopencv_objdetect -lopencv_contrib -lopencv_legacy -lopencv_flann

but if you don't, your system is not able to find it and cmake will not find it either:

Package opencv was not found in the pkg-config search path. Perhaps you should add the directory containing `opencv.pc' to the PKG_CONFIG_PATH environment variable No package 'opencv' found

Upvotes: 2

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