Linking errors when compiling code with OpenCV Libraries

Question

I'm trying to compile a sample program after installing Opencv with the command:

g++ hello-world.cpp -o hello-world -I /usr/local/include/opencv -L /usr/local/lib -lm -lcv -lhighgui -lcvaux

however, I'm getting an error that says:

/usr/bin/ld: cannot find -lcv  
/usr/bin/ld: cannot find -lhighgui  
/uer/bin/ld: cannot find -lcvaux
collect2: ld returned 1 exit status

What do I need to do to correct this?? I installed opencv by downloading the latest stable version and using cmake to create the build files, then ran make install from the command line.

Was there anything I may have missed?

Mukul Khanna · Accepted Answer · 2019-04-10 06:48:56Z

34

UPDATED-

Better use this command:

g++ opencv.cpp -o opencv -L `pkg-config --cflags --libs opencv`

The pkg-config command will locate the correct include and library for your source code.
For better handling with OpenCV programming go with an IDE like code::block.

Maybe this tutorial will help you in OpenCV programming with code::block:
How to Setup OpenCV for code :: block in Linux and Windows?

edited Apr 10, 2019 at 6:48

Mukul Khanna

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answered Dec 14, 2011 at 17:49

anarchy99

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1 Comment

Artur Over a year ago

For OpenCV 4 you should use g++ opencv.cpp -o opencv -L `pkg-config --cflags --libs opencv4`

psxls · Accepted Answer · 2013-12-26 01:29:23Z

21

Recently I started using OpenCV and I got similar problem and for me this works really well:

-lopencv_core -lopencv_imgproc -lopencv_highgui -lopencv_objdetect

Hope it will solve your problem.

edited Dec 26, 2013 at 1:29

psxls

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answered Jul 3, 2013 at 8:26

wildCat

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1 Comment

ggnoredo Over a year ago

with the addition of -lopencv_videoio this worked for me but i don't understand why we need to do this? I mean i already included the libraries and pkg-config lists all libraries. I started learning c++ recently but this is so different than other languages.

Ignacio Vazquez-Abrams · Accepted Answer · 2010-12-30 04:17:17Z

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You need to add another -L argument specifying the actual location of the OpenCV libraries.

answered Dec 30, 2010 at 4:17

Ignacio Vazquez-Abrams

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9 Comments

Kaigi Over a year ago

so instead of -L /usr/local/lib have -L <library location>? or an additional -L... and where would I find the libraries? When I do a make install, it shows me all the files are up to date and the location... but theres so many different things... all the .h files are in /usr/local/include/opencv... do the library files have a different extension?

Ignacio Vazquez-Abrams Over a year ago

Go through the cmake output to find out.

Kaigi Over a year ago

thanks for your quick response - editied my above comment but by the time I did, you had already responded. I think I may be unclear on what I'm really looking for. When I do a make install, it shows me all the files are up to date and the location... but theres so many different things... all the .h files are in /usr/local/include/opencv... do the library files have a different extension?

Kaigi Over a year ago

ok, all of those seem to be in /usr/local/lib/ - let me try this out - thanks

Ignacio Vazquez-Abrams Over a year ago

Then your -l arguments are wrong. Try -lopencv_highgui and the like.

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