Build error: Missing pkg-config, in Code::Blocks IDE on Raspberry Pi

C++
1

  1. Open CV has been installed on my Raspberry Pi 4.

  2. A check confirms that the latest version of Libopencv-dev is installed (4.6.0+dfsg-12).

  3. I am using the Code::Blocks IDE to devlop in C++.

  4. It is configured the use the Default CMake build tool.

  5. When trying to link to OpenCV4 library files from Code::Blocks IDE, I get the following error:
    g++ -L/usr/include/opencv4/ -L/usr/include/opencv4/opencv2/ -o bin/Release/TestCamera obj/Release/SimpleGrab.o ‘pkg-config --libs --cflags opencv4’ ‘pkg -config - - libs - -cflags opencv4’ -s

  6. I think this error may imply it cannot find the ‘pkg-config’.
    I am clearly missing something as the Pi is relatively new to me. so any help would be really appreciated.

2

pkg-config is deprecated / disabled by default
(no files installed for this)

try either:

  • specify libs & includes explicitly on the cmdline (recommended !!)
  • build your local makefile using cmake
  • rebuild the opencv libs & enable the pkg mechanism
3

Dear berak,
That makes perfect sense and I agree with your option 1 approach. However, whilst I can find the include files in: /usr/include/opencv4
I cannot find the path to the library files (.lib, .dll?). Could you help with this too, please?
Many thanks,
Chris

4

imo you have to go back to 1) (how did you install it ??)
DID you really run a final make install? what was the CMAKE_INSTALL_PREFIX set to ?

default should have been: /usr/local/include/opencv4 and /usr/local/lib for the libs. (note: local !) also look for *.so or *.la files , not dll on your os.

5

So, this far I have followed a number of installation scripts I have found online, including those requiring a build, which have failed for various reasons
. Is there one for the Raspberry Pi which you would recommend and that will work for the later versions of Pi OS?
Thank you.