Already have an account? But I can't compile the project still. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, @JoachimPileborg Yes, that was how I wrote the, Are these the first of the printed errors? Why would Henry want to close the breach? And the fix that worked for me was changing my CMakeLists.txt from: Copyright 2022 www.appsloveworld.com. Find centralized, trusted content and collaborate around the technologies you use most. Instead of manually tell the library path and linker options you can just create a dependency of your target with the library. What is an undefined reference/unresolved external symbol error and how do I fix it? Turning off BUILD_TESTS form cmake command, Compiling cpp samples on Mac OS X: Unknown CMake command "ocv_check_dependencies". Is it appropriate to ignore emails from a student asking obvious questions? Counterexamples to differentiation under integral sign, revisited. For both systems I have installed OpenCV in a custom location using: and similar for debug. I can't seem to this project to link if I include both OpenCV and Torch. I'm giving "sources" folder of OpenCV to CMake-GUI, No don't give source folder but "mingw-build", Which folder should I give? How can you know the sky Rose saw when the Titanic sunk? rev2022.12.11.43106. The best access pixel value method to an Mat binary image? My setup works on the first system, but fails on the second. (so it can be indexed properly for search, ppl here can quote you correctly, and so-on), the prebuild libs from SF do not cover mingw (you can't use VS libs with mingw, and g++ is notoriously bad at reporting such a problem). Yup, when I download the last Android OpenCV SDK, the header at sdk\native\jni\include\opencv2\imgcodecs\imgcodecs.hpp is empty, with an info that it's legacy (but no . If it find it may be it is the old folder. I ran opencv_test_imgcodecs on both machines, which works fine. target_link_libraries (main <lib1> <lib2>) To link the necessary libraries. Why is there an extra peak in the Lomb-Scargle periodogram? I have already run into the problem of my opencv2 directory . Not the answer you're looking for? Completed. Why does it fail then? One is with my user on my laptop, the other with a different user on a multiuser system. To set the target properties we call the function target_* (for instance target_compile_features(mytarget PUBLIC cxx_std_20) says that the target mytarget will use C++20 features and if someone links to us he will use the same compiler option automatically`. Any ideas how to fix my problem? cmake: undefined reference to cv::imread(std::__cxx11::basic_string 'cv::imread(std::__cxx11::basic_string<char, std::char_traits, std::allocator > const&, int)' opencv libopencv_highguilibopencv_imgcodecs 2 comments AntMorais commented on Dec 23, 2020 edited Install OpenCV from source on Linux https://github.com/pytorch/examples/blob/master/cpp/tools/InstallingOpenCV.md Why doesnt QT get detected when I want to build openCV? The text was updated successfully, but these errors were encountered: Is there anyway for me to check this? . Connect and share knowledge within a single location that is structured and easy to search. Creative Commons Attribution Share Alike 3.0. Would salt mines, lakes or flats be reasonably found in high, snowy elevations? Japanese girlfriend visiting me in Canada - questions at border control? The directories are different. updated I could solve my problem by changing the CMakeList.txt. Hi The video contains links to a Qt build version it seems. Although OpenCV link is optional but it would be great if this works. when I compile using g++. Central limit theorem replacing radical n with n, FFmpeg incorrect colourspace with hardcoded subtitles, Exchange operator with position and momentum. undefined reference to `cv::imread CLION cmake asked Nov 18 '16 cagdas001 31 1 3 7 updated Nov 18 '16 berak 32993 7 81 312 Hi, I'm using CLion as IDE and trying to link OpenCV. Are you saying that the problem could be due to compatibility issues between opencv and libtorch? I prepared OpenCV binaries with these steps. Why is Singapore currently considered to be a dictatorial regime and a multi-party democracy by different publications? Here's a few: I was working with some others and I got it compiled! undefined reference to 'cv::imshow(cv::String const&, cv::_InputArray const&)'. Can several CRTs be wired in parallel to one oscilloscope circuit? How many transistors at minimum do you need to build a general-purpose computer? Ready to optimize your JavaScript with Rust? We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. I have to use OpenCV on two systems, both Linux. But I'm having problem even with a very simple app. Linking to OpenCV - undefined reference to `cv::imread Follow. error using already compiled version of openCV, Opencv 'undefined reference to `cv::namedWindow.' (linking error), error: undefined reference to cv::cudacodec::createVideoReader, C++, OpenCv at c++ gives error though it is build right. Thanks for the great sample. So you should select "specify native compilers . Find centralized, trusted content and collaborate around the technologies you use most. Ready to optimize your JavaScript with Rust? Thanks for contributing an answer to Stack Overflow! Don't think the gcc version matter here, but stating them for completeness. Where does the idea of selling dragon parts come from? This works on the first system (gcc version 5.3.0) but fails on the second (gcc version 4.6.3). Now I also do not need to specify OpenCV_DIR any longer and can build with: Most of the time though I think this a more general CMake mistake. undefined reference to 'cv::imshow(cv::String const&, cv::_InputArray const&)'. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Any disadvantages of saddle valve for appliance water line? And the fix that worked for me was changing my CMakeLists.txt from: Thanks for contributing an answer to Stack Overflow! Try: g++ -o test_1 test_1.cpp `pkg-config opencv --cflags --libs` This should work to compile the source. Also note that you refer to a target. I then used the example given in the OpenCV documentation to test my setup: What is an undefined reference/unresolved external symbol error and how do I fix it? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, it's a linker error, check whether the library path is given proper and the library location. Why does the USA not have a constitutional court? Books that explain fundamental chess concepts. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Why was USB 1.0 incredibly slow even for its time? Why is Singapore currently considered to be a dictatorial regime and a multi-party democracy by different publications? Extract OpenCV files (from official website) However the build fails with: From this call, I figure that the libraries in the custom location should have been used. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Hi, I'm trying to link OpenCV to CLion. I prepared OpenCV binaries with these steps. But I'm having problem even with a very simple app. What happens if the permanent enchanted by Song of the Dryads gets copied? I am building a project with OpenCV 4 beta and when I use the function cv::imread or cv::imwrite I get an undefined reference to the functions. As far as I know sources folder is the same with github. Fixed by changing version of libtorch used. cmake install_name_tool absolute path for library on Mac OSX. Using CMake; OpenCv with Android studio 2.2+ using new gradle with cmake - undefined reference; OpenCV: undefined reference to `cv::imread when using cmake; OpenCv with Android studio 1.3+ using new gradle - undefined reference; Linker can not find OpenCV libraries when . also, your recent edit puts me wrong about using VS libs. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. What is the Difference between Installation OpenCV by Using the Pre-built Libraries & by Making Own Libraries from the Source Files ? confusion between a half wave and a centre tapped full wave rectifier, Arbitrary shape cut into triangles and packed into rectangle of the same area, Books that explain fundamental chess concepts. 1 I know this has been asked several times but still I am struggling with linker error undefined reference for simple opencv code. undefined_references asked Jul 18 '18 accdev 26 1 6 updated Jul 26 '18 I'm developing an app for android with react-native that uses opencv and the imread and imwrite functions. But CMake is using MinGW 4.9 as default, if you select "Use default native compilers". Solution 1. Does a 120cc engine burn 120cc of fuel a minute? In the United States, must state courts follow rulings by federal courts of appeals? What is an undefined reference/unresolved external symbol error and how do I fix it? I am trying to build a project with libtorch and opencv as dependencies. QGIS Atlas print composer - Several raster in the same layout. Getting undefined reference to OpenCV elements even when linking libraries. Where does the Glib::ustring reference come from? How object detect using yolov4 and opencv dnn on ROS? It might be due to the 2 libraries using different ABI's? In cmake gui you give "where is source code" and "where to build binaries". Does aliquot matter for final concentration? Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content, Unable to setup an iterator to a std::map of std::pair. Why is the federal judiciary of the United States divided into circuits? Add a new light switch in line with another switch? Why do quantum objects slow down when volume increases? I added the "bin" folder to system path. cocos2d-x 3.6 error: Error running command, return code: 1, Opencv 'undefined reference to `cv::namedWindow.' (linking error), cmake error : opencv2/opencv.hppopencv2/opencv.hppNo such file or directory, CMake error : catkin_make :::Running command Running command: "make -j4 -l4" in "/ws/build", CMake C++ Project librealsense: undefined reference to OpenGL with CLion. I tried to compile Super4PCS on Ubuntu 16.04 with system's OpenCV 2.4.9 installation. Why shall we install CMake for building Lib? My CMakeLists.txt is as follows: cmake_minimum_requir. All rights reserved. rev2022.12.11.43106. Is it because of the other OpenCV installation on the second system? Undefined reference to `g_mutex_lock' when compiling with OpenCV and caffe, Undefined reference when linking libopencv_gpu.so with OpenCV, How to linked OpenCV 3.4.5 dnn module with custom cv_bridge using catkin? I am currently stuck, I am trying to get a minimal program to compile, using both libtorch and opencv. When you build your solution or makefile using your CMakeLists.txt have you delete CMakeCache.txt? FFmpeg incorrect colourspace with hardcoded subtitles, What is this fallacy: Perfection is impossible, therefore imperfection should be overlooked, QGIS Atlas print composer - Several raster in the same layout. OpenCV: undefined reference to `cv::imread when using cmake Ask Question Asked 6 years, 8 months ago Modified 4 years, 7 months ago Viewed 6k times 0 I have to use OpenCV on two systems, both Linux. What are the differences between a pointer variable and a reference variable? "where to build binaries" is place where your makefile will do everything you mustfind in this folder CMakeCache.txt and OpenCVModules.cmake. How to make a image look more uniform without losing fine details, How to distinguish between click and double-click in opencv, Create a video from sequence of images on HTML. Does illicit payments qualify as transaction costs? There, he just added the following after the -o flag: When I saw that, I thought I might try to do that linking through CMakeLists.txt -- and it worked. Hi, I'm using CLion as IDE and trying to link OpenCV. 2016-11-18 14:13:47 -0500. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. Now I also do not need to specify OpenCV_DIR any longer and can build with: Most of the time though I think this a more general CMake mistake. Can i put a b-link on a standard mount rear derailleur to fit my direct mount frame. Do bracers of armor stack with magic armor enhancements and special abilities? OK I replaced screenshots. (we'll have to enquire further here). Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content, LibTorch and OpenCV Libs not working in same cmakelist file. where is source code is source opencv folder (where you put your download or git clone). Additionally, if I remember correctly, to use C++ thread thingies on linux, you must link to a threading library by yourself (see docu for find_package () and FindThreads module). Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. An install or uninstall procedure did not complete successfully. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. (sources and build). Ubuntu 10.10 12.0410.10(Ubuntu 12.04 ) Downgrading 3.4 project to NDK16 enabled it to build, but it fails to run when including imread, and crash on app startup. http://docs.opencv.org/2.4/doc/tutorials/introduction/linux_gcc_cmake/linux_gcc_cmake.html, To build the example using my custom OpenCV location I used. 2016-11-18 13:50:38 -0500. unable to locate opencv.sln after configuring with cmake. Thank in advance for any help! If he had met some scary fish, he would immediately return to the surface. Full code: #include <opencv2/opencv.hpp> using namespace cv; int main (int argc, char** argv) { // Read the image file Mat image = imread ("/path/to/image.jpg"); return 0; } as taken from this tutorial document. How is Jesus God when he sits at the right hand of the true God? Why does Cauchy's equation for refractive index contain only even power terms? undefined reference to cv::imread(std::__cxx11::basic_string . Trying to build 4.3 project with NDK18 (for symbols), posed an Expected NDK STL shared object file libgnustl_shared.so issue. This function should exist, it must be somewhere. How to make voltage plus/minus signs bolder? Created an empty folder opencv-mingw In CMake i selected the sourcecode Directory as C:\Qt\Tools\mingw492_32\bin Buid the binary in C:/opencv-mingw and hit configure button Selected MinGW Makefiles from dropdown menu. Getting undefined reference to OpenCV elements even when linking libraries. And unfortunately, the post you linked didn't improve the situation. And as build folder, I gave a empty folder ("mingw-build" in my case) After the "mingw32-make" command, generated DLLs and some exe files in "bin" folder. Why is Singapore currently considered to be a dictatorial regime and a multi-party democracy by different publications? This library type is by default compiled without position independent code (PIC) and, if not explicitly written in CMake, does not carry transitive linking information. After linking/associating my libraries, I have the following: There are also too many errors to put here. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. PSE Advent Calendar 2022 (Day 11): The other side of Christmas. confusion between a half wave and a centre tapped full wave rectifier. Below is o. Not the answer you're looking for? All I really needed was to provide the name of the library and put it into target_link_libraries like so: My dad, being completely unfamiliar with CMake, went and dug out the link.txt within the CMake build structure. I have two different classes contained in their own files, and I use them as part of the main class. uable to solve undefined reference to symbol with cmake, CMake third party library undefined reference, Include mongocxx drivers with Cmake results with undefined methods on Ubuntu, Exchange operator with position and momentum. Putting message(STATUS "${Open_CV_LIBS}") prints a list of libraries. And when I try to build, I'm getting the following messages. . Thanks a ton for the constructive criticism! Making statements based on opinion; back them up with references or personal experience. GitHub commented on Jul 12, 2021 The file was deleted, renamed, or moved to another location. (Email: learnzhaoshang@gmail.com). To learn more, see our tips on writing great answers. Actually I gave the "sources" folder (extracted by OpenCV installer) to CMake-GUI. For both systems I have installed OpenCV in a custom location using: cmake . Yes, it does. We already need these DLLs as far as I know, am I wrong? The installation package was faulty and contained Then it asked to specify native compilers Specified C:/Qt/Tools/mingw491_32/bin/gcc.exe for C Making statements based on opinion; back them up with references or personal experience. Not the answer you're looking for? Thanks for the great work. Error: undefined reference cv::dnn:experimental_dnn_v2::Net::Net(), how to solve error when using CMake with OpenCV, undefined reference to `__atomic_fetch_add_4 error while using opencv, undefined reference when cross-compiling for ARM with static OpenCV libraries, Code::Blocks return error when using OpenCV "undefined reference to `cvFree_'|" in C, How to show the whole image when using OpenCV warpPerspective, OpenCV imread(filename) fails in debug mode when using release libraries, How to include libgtk2.0-dev and pkg-config in cmake when installing openCV on Ubuntu 16, For Which images Haar_cascade_frontolface classifier are trainend in opencv, How to filter lines without Sobel filter in OpenCV, raw mono 8 bit bytearray to jpeg using hardware accelaration, OpenCV Noise Removal of video from static camera, error: (-2) could not find a writer for the specified extension in function imwrite_, Python CV: Detecting a shape made of lines, Removing black background/black stray straight lines from an image in python, Sampling from video frames and save them as an image - python openCV, Find 2D-3D correspondence of 4 non-coplanar points, Eigen missing from the installation for OpenCV3. Irreducible representations of a product of two groups, Finding the original ODE using a solution. They are in the same header file (using opencv version 3.4.1), but I get an undefined reference when trying to use imwrite, NOT imread. My setup works on the first system, but fails on the second. Is there a higher analog of "category with all same side inverses is a groupoid"? Connect and share knowledge within a single location that is structured and easy to search. There is no include directory! To learn more, see our tips on writing great answers. I am going to download it from source and build libtorch myself and see if it works. Is it appropriate to ignore emails from a student asking obvious questions? If you build your own opencv in mingw-build folder CMake normally won't be able to find opencv and you will have to give this folder in cmake GUI have you? add_executable (main $ {source_files}) You'll likely need to also call. I have two different classes contained in their own files, and I use them as part of the main class. It's strange to see a reference to Glib in a project that uses Qt and KDE. 131523084 Created November 18, 2016 19:33. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. How to solve undefined reference cv:. when compiling openCV application in Linux/Ubuntu? For your project you have to give "where to build binaries" for OpenCV_DIR (in cmakegui), Asked: would you do us a favour, and replace the screenshots with a text version ? This is my first time using cmake, I have no idea what I'm doing. CGAC2022 Day 10: Help Santa sort presents! My Libtorch version is libtorch1.3+cpu, and OpenCV version is 2.4.13 ( 2.4.9 doesn't work either). How do we know the true value of a parameter, in order to check estimator properties? The version I was using was the pre-cxx11 abi from here: I could solve my problem by changing the CMakeList.txt. How do you include OpenCV into a javascript project? Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. rev2022.12.11.43106. I know have. Find centralized, trusted content and collaborate around the technologies you use most. Extract OpenCV files (from official website), In the directory generated by CMake, execute "mingw32-make" command, Add "OPENCV_DIR" to system variables. CMake simplifies a lot the process of building and linking libraries together. CMake linking error, finding library but "undefined reference". Ready to optimize your JavaScript with Rust? Asking for help, clarification, or responding to other answers. CMake simplifies a lot the process of building and linking libraries together. What is the highest level 1 persuasion bonus you can have? Why does the USA not have a constitutional court? Did neanderthals need vitamin C from the diet? I know that it has to do with linker errors, but since I'm new to cmake, I'm not exactly sure what the proper way to use TARGET_LINK_LIBRARIES would be. ( 3rd link in the text below) But its for 5.4 ( and seems to contain virus/unclean ) so I could not check what Thanks for reaching out! I think the problem is that i downloaded a pre-compiled libtorch library which is compiled with _GLIBCXX_USE_CXX11_ABI=0 flag, this breaks compatibility with opencv. Why is python screen recorder not creating .avi file? However, Im at the same error. The same syntax works when im compiling only opencv. So, I am trying to write an applet for school, and part of it requires using cmake. To learn more, see our tips on writing great answers. Yes I tried it, already my IDE doing that with "Reset CMake Cache and Reload" option. Books that explain fundamental chess concepts. Targets are created using add_library and add_executable. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. But I'm having problem even with a very simple app. "bin" folder to system path it's only for execution not for link. CV2 Find Contours detecting the floor and not my target, Docker container random segmentation fault, how obtain good coordinate with triangulatePoints() from openCV, Masking fails when due to 'assertion failed' sameSize. My .cpp files refer to it everywhere but I can't find it. This is the output of cmake, so i know that the libraries are found: The version of libtorch I downloaded did not support cxx11 abi, and was therefore not compatible with opencv. Why is the federal judiciary of the United States divided into circuits? In the United States, must state courts follow rulings by federal courts of appeals? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Downgrading 4.3 project to NDK16 keeps the undefined reference to cv::imread exactly the same. Alright, I updated my cmake file to your suggestion. Is this an at-all realistic configuration for a DHC-2 Beaver? We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. However, if you recently compiled OpenCV from source, you will meet linking issue in run-time, the library will not be found. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Making statements based on opinion; back them up with references or personal experience. When both libraries are included in the cmake file, I get the error: Why is there an extra peak in the Lomb-Scargle periodogram? When using opencv, you may encounter undefined reference to cv::imread(std::__cxx11::basic_string, std::allocator > const & amp;, int)' The main reason is that the version of the function used and the version of the referenced library function are different, and it is necessary to ensure that the version of the used function and the referenced library function is the same. I am building a project with OpenCV 4 beta and when I use the function cv::imread or cv::imwrite I get an undefined reference to the functions. Thanks for contributing an answer to Stack Overflow! There are 2 folders. Asking for help, clarification, or responding to other answers. This is my code: #include <opencv2/highgui.hpp> using namespace cv; int main (int argc, char** argv) { Mat inputImage = imread (argv [1]); imshow ("Input Image", inputImage); waitKey (0); } Following a short snippet on how it should it look like: What is the highest level 1 persuasion bonus you can have? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Following a short snippet on how it should it look like: opencv_highgui and torch are targets like main. I will try your response now then I would write the result, ^^ yea, all cool. I know have. Is it possible to hide or delete the new Toolbar in 13.1? This is likely an ABI compatibility issue. I think it might be related to that on the first system there is no OpenCV in the system path installed, while in the second system there is. undefined reference to `cv::Mat:deallocate ()'. E-learn.cn | ICP2021010369-1 | ICP2021010369-1 My CMakeLists.txt is as follows: cmake_minimum_required(VERSION 3.1.0) project(myImageProgram) set(CMAKE_PREFIX_PATH /home/marios-cellink/libtorch) find_package(OpenCV 4.0.0 REQUIRED) How cap.get(cv2.CAP_PROP_POS_MSEC) works? Asking for help, clarification, or responding to other answers. Why does cvSet2D take in a tuple of doubles, and why is this tuple all 0 save for the first element? I still defined Torch_DIR as it wouldnt work otherwise. This is a linker issue. CMake(BNO055 Driver).BNO055CMake,.CMake..,< function>, . Yeh this fix problem, more precisely add "-loopencv_core" or any lib like "-lopencv_(THE LIB OPENCV NAME HERE) problem Error message: undefined reference to ` CV:: imread (STD:: String const & amp;, int) ' When the above error occurs, I thought there was a problem with the opencv link, so I have been trying to solve the problem of importing opencv and trying to link the library in various ways, but the error will always appear in the end OpenCV: undefined reference to `cv::imread when using cmake, http://docs.opencv.org/2.4/doc/tutorials/introduction/linux_gcc_cmake/linux_gcc_cmake.html. opencvundefined reference to cv::imread(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int)' How to find specific/local files via CMake, Looking for a 'cmake clean' command to clear up CMake output. I am using cmake as my build system due to the fact that it is recommended for both these libraries. Using CMake, OpenCv with Android studio 2.2+ using new gradle with cmake - undefined reference, OpenCV: undefined reference to `cv::imread when using cmake, OpenCv with Android studio 1.3+ using new gradle - undefined reference, Linker can not find OpenCV libraries when using CMake, Error:(49) undefined reference to 'cv::Stitcher::createDefault(bool)' in using OpenCV native in Android, Building a "hollow world" error using cmake and opencv: undefined reference to viz's moduls, Undefined reference to symbol 'gzclose' with cmake and opencv, OpenCV CMake undefined reference to function, A lot of undefined reference errors using opencv static-libraries in eclipse c++ linux, Issue with the linker using opencv and C++ - Undefined Reference, undefined reference to opencv function when i compiled with Makefile, Vector undefined when using OpenCV nonfree libraries, Undefined reference to various functions while using opencv, Undefined reference to v8 when linking c++ node addon using gyp, OpenCV Android implementation with CMAKE undefined reference to 'cv::fastFree(void*) Error, Undefined Opencv References when using Qt + Opencv. get mingw-64 and cmake,, and build from (rather github) src, before trying to build your own project. "undefined reference" usually indicates that the compiler/linker cannot find the shared libraries used by your program. ("C:\OpenCV\mingw-build" in my case). I notice that you call. 'undefined reference to' with cmake Ask Question Asked 9 years, 7 months ago Modified 9 years, 6 months ago Viewed 33k times 5 So, I am trying to write an applet for school, and part of it requires using cmake. Connect and share knowledge within a single location that is structured and easy to search. OpenCV: comparing simple images with small difference. @SGaist. https://pytorch.org/get-started/locally/. 2 comments shivSD commented on Aug 30, 2019 alalek closed this as completed on Sep 1, 2019 Sign up for free to join this conversation on GitHub . Instead of manually tell the library path and linker options you can just create a dependency of your target with the library. A target has a public and a private interface. I have included their headers as such in the main project header: The problem I have is that when I run make after I've run cmake, I get undefined reference errors for any instance in which I try to use one of the two libraries. I will try to compile on my laptop maybe I made some typo, let me download opencv and torch :). Does illicit payments qualify as transaction costs? Do bracers of armor stack with magic armor enhancements and special abilities? This is because the include directory of the library is something that the library itself knows! 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