Darknet: How to install opencv to work with makefile?

[mfaramarzi]

I see that opencv that I installed through "conda" could not be recognized by "make".
According to AlexeyAB"s guide, "use your preferred package manager (brew, apt), build from source using vcpkg or download from OpenCV official site".
Doesn't installing by a virtual env like conda do the same thing?
I am really confused how should make it work!

I also followed opencv guide (https://docs.opencv.org/3.4/d2/de6/tutorial_py_setup_in_ubuntu.html) to install opencv inaide darknet-master directory but it didnt work at the last steps as below

[WongKinYiu]

opencv in conda is for python.

for darknet, you can use:

apt update
apt install libopencv-dev

[mfaramarzi]

@WongKinYiu
Thanks for your response. I tried this way to install openscv:
sudo apt-get update
sudo apt-get install libopencv-dev
And it was installed successfully.
but then when I wanted to compile by "make"/ make -j4
I got this error:

[WongKinYiu]

try

make clean
make -j4

[mfaramarzi]

@WongKinYiu
Actually it finally worked. Those commands were correct. I did "make" inside "darknet-master" and I got opencv working :+1: