I installed opencv on a lubuntu 12.10 distro. Then when I try to compile a code which is using opencv it says it can't find it. So I try in a terminal :
pkg-config --cflags --libs opencv
It answers me that it can't find opencv. But the files are installed in /usr/lib. I don't understand why it can't find them.
You have to put pkg-config --cflags --libs opencv at the end of your g++ line. For example :
g++ test.cpp -o test `pkg-config --cflags --libs opencv`
Compiles
g++ `pkg-config --cflags --libs opencv` test.cpp -o test
Doesn't compile and have undefined reference.
For OpenCV 4 you might have to use:
pkg-config --cflags --libs opencv4
(Note the 4 in the end!)
From OpenCV 4:
add -DOPENCV_GENERATE_PKGCONFIG=YES to cmake build arguments.
Use YES, ON is not working anymore.
Related
I'm trying out this github repository, one of the requirements is to have opencv 3.1
when I run pip list I have opencv-python and opencv-contrib-python both version 4.7.0.68
$ g++ -std=c++11 Heartbeat.cpp opencv.cpp RPPG.cpp `pkg-config --cflags --libs opencv` -o Heartbeat
but when I run the above I get the error below
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
Please use opencv4 instead of opencv. So your command will look like:
g++ -std=c++11 Heartbeat.cpp opencv.cpp RPPG.cpp `pkg-config --cflags --libs opencv4` -o Heartbeat
It should work.
I have OpenCV 4.5.1 installed in Linux. But each time I restart I have to separely provide path to the headers and linker flags. and then compile ?
export PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/home/parallels/opencv4.5-custom/lib/pkgconfig
pkg-config --cflags --libs opencv4
and then
g++ -Wall -std=c++11 -o main main.cpp $(pkg-config --cflags --libs opencv4)
I just want to run the g++ comand each time
good morning,
please I need help-
I have a file: s.cpp
that uses:
#include <opencv2/highgui.hpp>
#include <opencv2/features2d.hpp>
and I wrote a makefile like this:
s: s.o
g++ s.o -o s
s.o: s.cpp
g++ s.cpp -c `pkg-config --cflags --libs opencv`
clean: rm -f s
and got the error:
g++ s.cpp -c `pkg-config --cflags --libs opencv`
s.cpp:9:10: fatal error: opencv2/highgui.hpp: No such file or directory
#include <opencv2/highgui.hpp>
^~~~~~~~~~~~~~~~~~~~~
compilation terminated.
please, I dont know what to do
please someone can help?
if you are are trying to link more libraries all together in one time using the pkg-config command, I solved my problems on code::blocks with the command
pkg-config --libs --cflags opencv4
written in the project->build option->"program name"->linker settings->other linker option
I am using ubuntu 12.4 g++ i'm working on libxml++ library I have included this library in my program but I am getting an error saying
libxml++/libxml++.h: No such file or directory
i also tried compiling using g++ main.cc -o main pkg-config --cflags --libs libxml++-2.6 but it is not working. I have installed the latest libraries using sudo apt-get install libxml++.
While compiling for libxml we have to use these options. pkg-config --cflags --libs libxml++-2.6 this should be in single quotation mark / Backticks ("`", grave accents), .
So the command should be like this.
$ g++ main.cc -o program `pkg-config --cflags --libs libxml++-2.6`
or go through this once. http://developer.gnome.org/libxml++/stable/
I'm trying to setup a trivial OpenCV example following instructions from here. But when I try to run my example using
$ g++ -ggdb `pkg-config --cflags opencv` -o `basename opencvtest.cpp .cpp` opencvtest.cpp `pkg-config --libs opencv`
$ ./opencvtest`
I get the following error
g++ error missing argument to ‘-l’
I would appreciate any insight on how I could solve this.