cmake find_package specify path

Question

I have 2 versions of OpenCV installed on my machine. One is in /usr/local/opencv3.1. I presume the install location of the other one (version 3.4) is /usr/local. Anyway, find_package(OpenCV 3.0 REQUIRED) sets OpenCV_DIR:PATH=/usr/local/share/OpenCV. This folder contains:

haarcascades OpenCVConfig.cmake OpenCVModules-release.cmake java OpenCVConfig-version.cmake valgrind_3rdparty.supp lbpcascades OpenCVModules.cmake valgrind.supp

In this case, version 3.4 is used. How can I specify in CMakeLists.txt to use the other version (3.1) knowing its install location? I've tried:

find_package(OpenCV 3.0 REQUIRED PATH /usr/local/opencv3.1)

Which returns an error:

Could NOT find OpenCV (missing: PATH /usr/local/opencv3.1) (found suitable version "3.4.1", minimum required is "3.0")

and

set(OpenCV_DIR /usr/local/opencv3.1/OpenCV/*) # also tried OpenCV_ROOT_DIR, OPENCV_ROOT_DIR find_package(OpenCV 3.0 REQUIRED)

Which does nothing. It still finds version 3.4. I'd be grateful for any help. Thank you.

api55 · Accepted Answer · 2018-04-13 12:00:14Z

75

In the find_package documentation you have that you can set a path to be searched with PATHS you were missing the S... also you can do something like:

find_package (<package> PATHS paths... NO_DEFAULT_PATH) find_package (<package>)

Which will check for the path you wrote first, the if it is found it will set found to true and the second instruction will be skipped.

Also, you can use the EXACT option to match an specific version, in case it tries to select 3.4 due to being a newer version.

find_package(OpenCV 3.1 EXACT REQUIRED PATHS /usr/local/opencv3.1)

I hope this helps, if not, write a comment

answered Apr 13, 2018 at 12:00

api55

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5 Comments

Gerry Over a year ago

find_package(OpenCV 3.1 EXACT REQUIRED PATHS /usr/local/opencv3.1) works in my case. Thank you.

Bersan Over a year ago

I just tested this, and still didn't work, until I commented the second line (i.e., only worked when there was JUST the option with the specified path)

api55 Over a year ago

@Bersan The documentation says to use it multiple times... Normally I only use the first one but without NO_DEFAULT_PATH when I need one library in a specific path and usually it works good.... However I used it for libraries that are not installed in my system but just compiled....

leanid.chaika Over a year ago

it works for me, if I set set(SDL2_DIR /usr/local/lib/cmake/SDL2) before find_package(SDL2 REQUIRED)

WillSapgreen Over a year ago

Also works for OpenCV 4.4 which is installed in /usr/local/ (default installed from source) My command: find_package(OpenCV 4.4 EXACT REQUIRED PATHS /usr/local/) Thanks!!!

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