I've been stuck for a while now and I can't figure out how to get freeglut working. I thought I knew what it was asking me to do, so I added that set(prefix_path) line but it didn't do anything. Am I supposed to write my own freeglut-config.cmake or what?
Note: I am using the freeglut for MinGW package from this website
CMake File:
cmake_minimum_required(VERSION 3.7)
project(HW1)
set(CMAKE_CXX_STANDARD 11)
set(SOURCE_FILES Triangle.cpp)
set(CMAKE_PREFIX_PATH "C:/freeglut")
find_package(GLEW REQUIRED STATIC)
find_package(FREEGLUT REQUIRED)
find_package(OPENGL REQUIRED)
include_directories(${FREEGLUT_INCLUDE_DIRS} ${GLEW_INCLUDE_DIRS} ${OPENGL_INCLUDE_DIRS})
link_directories(${FREEGLUT_LIBRARY_DIRS} ${GLEW_LIBRARY_DIRS} ${OPENGL_LIBRARY_DIRS})
add_definitions(${FREEGLUT_DEFINITIONS} ${GLEW_DEFINITIONS} ${OPENGL_DEFINITIONS})
add_executable(HW1 ${SOURCE_FILES})
target_link_libraries(HW1 ${FREEGLUT_LIBRARIES} ${GLEW_LIBRARIES} ${OPENGL_LIBRARIES})
Full error:
CMake Error at CMakeLists.txt:8 (find_package):
By not providing "FindFREEGLUT.cmake" in CMAKE_MODULE_PATH this project has
asked CMake to find a package configuration file provided by "FREEGLUT",
but CMake did not find one.
Could not find a package configuration file provided by "FREEGLUT" with any
of the following names:
FREEGLUTConfig.cmake
freeglut-config.cmake
Add the installation prefix of "FREEGLUT" to CMAKE_PREFIX_PATH or set
"FREEGLUT_DIR" to a directory containing one of the above files. If
"FREEGLUT" provides a separate development package or SDK, be sure it has
been installed.
If your application is GLUT-compatible, that it doesn't use any extension of freeglut, then it is better to search GLUT instead of FREEGLUT:
find_package(GLUT REQUIRED)
"Find" script used by this command is already shipped into CMake distro, and it searches freeglut too.
(Note, that with that command variables for include directories and linking libraries are GLUT_INCLUDE_DIR and GLUT_LIBRARY correspondingly).
If your application requires exactly freeglut (that is, uses some of its extensions incompatible with other GLUT implementations), you need to ship your package with FindFREEGLUT.cmake script and adjust CMAKE_MODULE_PATH variable correspondingly:
# Assuming you have <source-dir>/cmake/FindFREEGLUT.cmake
list(APPEND CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/cmake")
find_package(FREEGLUT REQUIRED)
You may find existing script in the net, or write it by yourself, like here.
In any case, if you have freeglut installed into non-system location, you need to hint CMake about that. E.g., by adjusting CMAKE_PREFIX_PATH.
Related
I have troubles finding out the right "library target name" to be used in a cmake file, for packages installed using vcpkg.
In example, I installed the gtest package using vcpkg install gtest. My sample cmake file looks like:
#CMakeLists.txt
cmake_minimum_required(VERSION 3.0)
project(example)
add_executable(main main.cpp)
find_package(gtest REQUIRED)
target_link_libraries(main gtest) # here, "gtest" is not the right name!
Running cmake, a solution for Visual Studio is generated, but after running cmake --build ., I get the error:
../use-cmake-vcpkg\main.cpp(1): fatal error C1083: Cannot open include file: 'gtest/gtest.h': No such file or directory ..
Turns out the line: target_link_libraries(main gtest) isn't correct, and I need to use another "name" to include/link the gtest package.
Is there a way (using cmake or vcpkg) to find out what is the correct target name to be used? (for gtest in this case, but also for any other pacakage?)
When use find_package(XXX), it can work in two modes: MODULE and CONFIG. And resulted variables and targets of this call depend on the mode.
If FindXXX.cmake file exists (and can be found), the MODULE mode is used and given file is processed. Otherwise, if the package is shipped with XXXConfig.cmake file, CONFIG mode is used and given file is processed. If none of this file exists, CMake emits an error (if called with REQUIRED keyword) or a warning (without REQUIRED keyword).
In case of gtest package, CMake is shipped with FindXXX.cmake script, so this script is processed in MODULE mode. You may find description of this script in the documentation, which tells that you need to use GTest::GTest target for link with gtest:
target_link_libraries(main GTest::GTest)
Not all packages provide a CMake library definition. If you're lucky, then vcpkg install will show you the name:
$ ./vcpkg install openssl
The package openssl is compatible with built-in CMake targets:
find_package(OpenSSL REQUIRED)
target_link_libraries(main PRIVATE OpenSSL::SSL OpenSSL::Crypto)
This will work even if you've already installed the package, so you can use it anytime to query the package name.
On the other hand, if vcpkg install <pkg> doesn't say anything about CMake, then you need to include it manually in your CMake file, by finding the include path and the library files.
Here is an example of such a case, here for the live555 library:
# Use one of the headers to locate the include location
find_path(LIVE555_INCLUDE_DIR liveMedia.hh)
# Find the libraries
find_library(LIVE555_LIBRARY1 liveMedia)
find_library(LIVE555_LIBRARY2 groupsock)
find_library(LIVE555_LIBRARY3 BasicUsageEnvironment)
find_library(LIVE555_LIBRARY4 UsageEnvironment)
add_executable(rtsp testRTSPClient.cpp)
target_include_directories(rtsp PRIVATE ${LIVE555_INCLUDE_DIR})
target_link_libraries(rtsp PRIVATE ${LIVE555_LIBRARY1} ${LIVE555_LIBRARY2} ${LIVE555_LIBRARY3} ${LIVE555_LIBRARY4})
This may be related to my previous question.
I copied the code from the "Simple Example" here.
I copied the cmake instructions from here.
The error I am getting is:
-- Checking for module 'gtkmm-3.0'
-- No package 'gtkmm-3.0' found
CMake Warning (dev) in CMakeLists.txt:
No cmake_minimum_required command is present. A line of code such as
cmake_minimum_required(VERSION 3.10)
should be added at the top of the file. The version specified may be lower
if you wish to support older CMake versions for this project. For more
information run "cmake --help-policy CMP0000".
This warning is for project developers. Use -Wno-dev to suppress it.
-- Configuring done
-- Generating done
-- Build files have been written to: /path-to-files/
This is my CMakeLists.txt
project(SimpleExample)
find_package(PkgConfig REQUIRED)
set(CMAKE_PREFIX_PATH "/usr/lib/x86_64-linux-gnu/pkgconfig;/usr/share/pkgconfig")
pkg_check_modules(GTKMM gtkmm-3.0)
link_directories(${GTKMM_LIBRARY_DIRS})
include_directories(${GTKMM_INCLUDE_DIRS})
add_executable(SimpleExample SimpleExample.cpp)
target_link_libraries(SimpleExample ${GTKMM_LIBRARIES})
There's a really dumb line in here set(CMAKE_PREFIX_PATH "/usr/lib/x86_64-linux-gnu/pkgconfig;/usr/share/pkgconfig") which I'm fairly sure isn't supposed to be there, however in my previous question I was struggeling to figure out why pkg-config wasn't finding the correct locations for the gtkmm-3.0.pc file.
So I did a search to try and figure out how to set the paths for pkg-config manually in a CMake file. That is what I came up with. However it does not work.
CMake variable CMAKE_PREFIX_PATH and environment variable PKG_CONFIG_PATH denote different paths:
CMAKE_PREFIX_PATH points to the installation prefix(es) of the one or more programs.
PKG_CONFIG_PATH points to location(s) of .pc files.
When CMake wants to call pkg-config via pkg_check_modules command, it translates content of CMAKE_PREFIX_PATH variable into PKG_CONFIG_PATH by appending sufficies to every path in CMAKE_PREFIX_PATH variable (see branch if(NOT "${_extra_paths}" STREQUAL "") in FindPkgConfig.cmake):
lib/pkgconfig
share/pkgconfig
lib32/pkgconfig or lib32/pkgconfig for some distros
some other system-specific sufficies
As you can see, you may obtain /usr/share/pkgconfig in PKG_CONFIG_PATH by using /usr in CMAKE_PREFIX_PATH.
But obtaining /usr/lib/x86_64-linux-gnu/pkgconfig in PKG_CONFIG_PATH is very questionable.
In any case, parameters described the host system itself are normally passed via environment or cmake arguments, not by the project's CMakeLists.txt. In given case command line
export PKG_CONFIG_PATH="/usr/lib/x86_64-linux-gnu/pkgconfig:/usr/share/pkgconfig"
is much more simpler (and reliable) than setting CMAKE_PREFIX_PATH CMake variable.
How can you link GLEW to a project with CMake?
We've been trying to link GLEW to our project using CMake for at least 3 hours without any success so any help is accepted.
I'm using the FindGLEW.cmake which comes with CMake 3.1.0
CMakeLists.txt
find_package(GLEW REQUIRED)
if (GLEW_FOUND)
include_directories($(GLEW_INCLUDE_DIRS))
endif()
Environment Variables
I'm using MinGW w64 to compile the sources and we successfully linked GLFW and GLM just by copying the includes and libs to their respective folders, but after doing the same with GLEW, CMake still couldn't find it.
Sorry if I wasn't clear enough while formulating the question. I will provide any additional information required.
Edit: I've managed to link the header files by specifying their location in the CMake Cache file, though I'm getting undefined reference to glew functions like glewInit().
Typical CMake scripts like FindGLEW will define variables that specify the paths and files that your project needs. If the script can't automatically identify the correct paths (usually because of nonstandard install location, which is fine), then it leaves these variables up to you to fill in.
With command line CMake, you use the -D flag to define and set the value of a given variable. Other CMake interfaces, like CMake-gui or an IDE integration, give you this ability some other way.
However you do it, you can also modify the cache directly (CMakeCache.txt) and see what CMake is using in there or just clear the cache altogether. You'll have to rerun CMake for it to pick up your changes.
When it comes to linking, that's when you need to tell CMake which libs to link. Use the link_libraries command with what the automated script gives you.
find_package(GLEW REQUIRED)
include_directories(${GLEW_INCLUDE_DIRS})
link_libraries(${GLEW_LIBRARIES})
Other answers do obviously work, but the target based style of cmake makes it even easier since the GLEW find module defines the imported target GLEW::GLEW. All you need is:
find_package(GLEW REQUIRED)
target_link_libraries(YourTarget GLEW::GLEW)
YourTarget is the target that you created with add_executable or add_library. No need to explicitly add include directories, they are added automatically by linking the targets.
The secret of find_package(GLEW) is in FindGLEW.cmake file with cmake install.
find_path(GLEW_INCLUDE_DIR GL/glew.h)
find_library(GLEW_LIBRARY NAMES GLEW glew32 glew glew32s PATH_SUFFIXES lib64)
The find_path and find_library commands find paths in standard system paths. If you want them to find paths in user defined directories, you should tell them.
For example:
set(CMAKE_PREFIX_PATH "d:/libs/glew-1.10.0")
set(CMAKE_LIBRARY_PATH "d:/libs/glew-1.10.0/lib/Release/Win32/")
find_package(GLEW REQUIRED)
Reference:
http://www.cmake.org/cmake/help/v3.0/command/find_path.html
http://www.cmake.org/cmake/help/v3.0/command/find_library.html
I was struggling hard to link glew to cmake through command line on mac. This might be helpful but I am not sure :) I will walk you through step by step of what I have done.
I installed Cmake source from the web.
Then I went inside the cmake folder in terminal and typed
./bootstrap && make && make install
(this will install cmake command line tools on our OS platform)
I have some exercise files. I want cmake to generate xcode files for me for all those exercise files (ex. triangles.cpp, shader.cpp etc) So i made a directory inside exercise files folder.
$ mkdir xcode
$ cd xcode
$ cmake -G "Xcode" ..
At this point, Cmake suppose to install all xcode files that included correct libraries. But there was an error :
$ cmake -G "Xcode" ..
CMake Warning (dev) at CMakeLists.txt:3 (cmake_minimum_required):
Compatibility with CMake < 2.4 is not supported by CMake >= 3.0.
This warning is for project developers. Use -Wno-dev to suppress it.
system name is: Darwin-14.1.0
system processor is: x86_64
-- Could NOT find GLEW (missing: GLEW_INCLUDE_DIR GLEW_LIBRARY)
-- Could NOT find Doxygen (missing: DOXYGEN_EXECUTABLE)
-- Using Cocoa for window creation
-- Using NSGL for context creation
-- Building GLFW only for the native architecture
CMake Error: The following variables are used in this project, but they are set to NOTFOUND.
Please set them or make sure they are set and tested correctly in the CMake files:
GLEW_LIBRARY
linked by target "TextureLoader" in directory /Users/Mydir/Desktop/Exercise/Exercise Files
-- Configuring incomplete, errors occurred!
Then to make sure I have installed GLEW and all its libraries correctly, I ran
$brew install glew
Yes, I have installed glew already but it was NOT linked. See the Warning below:
Warning: glew-1.12.0 already installed, it's just not linked
Then I ran the following commands:
$ brew unlink glew
$ brew link glew
And I have solved the error. So just make sure that you have linked glew. Hope this helps.
Happy Coding :)
Finally I found a simple and short CMakeLists which works if you have installed everything in default paths.(openGL, glfw and glew)
cmake_minimum_required(VERSION 3.3)
project(openGL_tutorial)
find_package(OpenGL REQUIRED)
if(NOT OPENGL_FOUND)
message("ERROR: OpenGL not found")
endif(NOT OPENGL_FOUND)
set(GL_LIBRARY GL GLU X11)
add_executable(openGL_tutorial main.cpp)
target_link_libraries(openGL_tutorial glfw GLEW libGLEW.so libGLU.so libGL.so)
For what it is worth, in 2023, this works for me, on macOS, with GLEW, GLFW, and CMake installed using Homebrew:
cmake_minimum_required(VERSION 3.10)
project(Project)
add_executable(Project main.cpp)
find_package(glfw3 REQUIRED)
find_package(GLEW REQUIRED)
target_link_libraries(Project glfw GLEW::glew)
I installed Ogre3D 1.8.1 (the source package) on Ubuntu 12.04 and everything went fine (I managed to run some samples on the Ogre interface). However, I hit a problem while I was compiling an external project (that one) that needed the OpenCV, ArUco and Ogre librarys. When I run the CMake of the project, I receive the following:
CMake Error at CMakeLists.txt:46 (find_package):
By not providing "FindOGRE.cmake" in CMAKE_MODULE_PATH this project has
asked CMake to find a package configuration file provided by "OGRE", but
CMake did not find one.
Could not find a package configuration file provided by "OGRE" with any of
the following names:
OGREConfig.cmake
ogre-config.cmake
Add the installation prefix of "OGRE" to CMAKE_PREFIX_PATH or set
"OGRE_DIR" to a directory containing one of the above files. If "OGRE"
provides a separate development package or SDK, be sure it has been
installed.
-- Configuring incomplete, errors occurred!
I know where the FindOGRE.cmake is, it's in the /usr/local/lib/OGRE/cmake, but I don't know how to say to CMake to look for that folder and fix this problem.
You just need to use the -D command line option along with the CMAKE_MODULE_PATH variable:
cmake . -DCMAKE_MODULE_PATH=/usr/local/lib/OGRE/cmake
Just for the record, an alternative solution would be to add the module path directly in the CMakeLists.txt. For example (tested on Debian 9):
set(CMAKE_MODULE_PATH "/usr/share/OGRE/cmake/modules/;${CMAKE_MODULE_PATH}")
Just make sure to add the line before find_package is called.
For me, it only works to set the following in CMakeLists.txt before find_package:
set(OGRE_DIR /usr/share/OGRE/build/sdk/CMake)
Note that the CMake directory is the one containing OGREConfig.cmake. For some reason, my CMake ignores CMAKE_MODULE_PATH.
Maybe, of some help for someone
For me, this solution work on manjaro:
set(CMAKE_MODULE_PATH "/usr/lib/OGRE/cmake;${CMAKE_MODULE_PATH}")
find_package(OGRE QUIET)
if (OGRE_FOUND)
include_directories( ${ogre_INCLUDE_DIR})
link_directories(${OGRE_LIBRARIES})
message(STATUS "OGRE: FOUND")
else()
message(STATUS "OGRE: NOT FOUND")
endif()
CMake cannot find my Eigen3 package. I set an environment variable called
EIGEN3_INCLUDE_DIR
pointing to the path where FindEigen3.cmake is.
Then in the CMakelists.txt I wrote:
find_package( Eigen3 REQUIRED )
include_directories( EIGEN3_INCLUDE_DIR )
I get next message of error:
CMake Error at C:/Program Files (x86)/CMake 2.8/share/cmake-2.8/Modules/FindPackageHandleStandardArgs.cmake:91 (MESSAGE):
Could NOT find Eigen3 (missing: EIGEN3_INCLUDE_DIR EIGEN3_VERSION_OK)
(Required is at least version "2.91.0")
Call Stack (most recent call first):
C:/Program Files (x86)/CMake 2.8/share/cmake-2.8/Modules/FindPackageHandleStandardArgs.cmake:252 (_FPHSA_FAILURE_MESSAGE)
C:/Program Files (x86)/CMake 2.8/share/cmake-2.8/Modules/FindEigen3.cmake:76 (find_package_handle_standard_args)
test/test_quaternion/CMakeLists.txt:25 (find_package)
Any idea on what I am missing or doing wrong?
Since Eigen3 is completely header only, all you ever need is the path to the include directory. And this one, you are already defining manually anyway. So there is no real need for a FindEigen3.cmake or FIND_PACKAGE call.
Simply use
INCLUDE_DIRECTORIES ( "$ENV{EIGEN3_INCLUDE_DIR}" )
or
SET( EIGEN3_INCLUDE_DIR "$ENV{EIGEN3_INCLUDE_DIR}" )
IF( NOT EIGEN3_INCLUDE_DIR )
MESSAGE( FATAL_ERROR "Please point the environment variable EIGEN3_INCLUDE_DIR to the include directory of your Eigen3 installation.")
ENDIF()
INCLUDE_DIRECTORIES ( "${EIGEN3_INCLUDE_DIR}" )
A few notes:
If you want to access the content of a CMake variable, make sure to use ${...}
$ENV{....} accesses environment variables.
The second example will stop with an error if the environment variable is not set (and, thus, EIGEN3_INCLUDE_DIR cmake variable is empty)
Be careful to use quotation marks around (evaluated) variables if they could contain whitespace. Otherwise, CMake will interpret it as a list.
If you want to use custom find modules, make sure to either place them in you CMake installation or, as #Fraser pointed out above, make sure to point CMAKE_MODULE_PATH to the directory where it is. Not sure, but it could be that CMake checks the current directory as well automatically (where your CMakeLists.txt resides. Anyhow, setting EIGEN3_INCLUDE_DIR is totally unrelated to the location of FindEigen3.cmake
However, it could be that your FindEigen3 script evaluates this variable to determine the location of your Eigen3 installation.
Alternatively, self-built CMake-based projects often provide a <PackageName>Config.cmake. If you point a variable called <PackageName>_DIR to the directory containing this file, you can use FIND_PACKAGE( <PackageName> ...) as normal. See documentation of FIND_PACKAGE for details.
Eigen >= 3.3 has direct CMake integration, so it seems yours isn't set up correctly.
Assume Eigen has been installed to /opt/eigen/3.3 with default settings. Append or prepend the the location /opt/eigen/3.3 to the environment variable CMAKE_PREFIX_PATH e.g in bash:
export CMAKE_PREFIX_PATH="$CMAKE_PREFIX_PATH:/opt/eigen/3.3"
Then CMake should pick it up.
If you are writing your own CMakeLists.txt that uses Eigen I suggest using code like this:
find_package (Eigen3 3.3 REQUIRED)
add_executable (example example.cpp)
target_link_libraries (example Eigen3::Eigen)
You should not use include_directories since CMake 3 was released -- the targets approach should be preferred whenever available.
First, make sure Eigen is properly installed. Refer to the INSTALL file that comes with the tarball.
Second, copy the cmake/FindEigen3.cmake file from the tarball to the directory containing your CMakeLists.txt.
In your CMakeLists.txt add:
set(CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR})
find_package(Eigen3 REQUIRED)
include_directories(${EIGEN3_INCLUDE_DIR})
Now you should be able to do e.g. #include <Eigen/Core>.
All of this comes (mostly) from this source.
This approach has the advantage over e.g. include_directories("$ENV{EIGEN3_INCLUDE_DIR}") that it the uses CMake's standard mechanism for finding external dependencies, making it easier for someone else (or your future self) to pick up the project, possibly on another platform.
(However, it would be nice if Eigen itself installed an EigenConfig.cmake file, making it accessible through the find_package mechanism without any extra paths.)
I found another solution here (which referred to here) which uses the pkg-config file :
find_package(PkgConfig)
pkg_search_module(Eigen3 REQUIRED eigen3)
As a detailed explanation of the note 7 from the top answer of Johannes. By using the "Config mode" rather than "Module mode" of CMake find_packate(), only writing
find_package( Eigen3 REQUIRED )
include_directories( EIGEN3_INCLUDE_DIR )
in CMakeLists.txt is enough.
Please refer to the INSTALL guidance text file contained in the eigen source code directory (eg. extracted from eigen-3.3.7.tar.gz downloaded from official website), which said:
Method 2. Installing using CMake
********************************
Let's call this directory 'source_dir' (where this INSTALL file is).
Before starting, create another directory which we will call 'build_dir'.
Do:
cd build_dir
cmake source_dir
make install
The "make install" step may require administrator privileges.
You can adjust the installation destination (the "prefix")
by passing the -DCMAKE_INSTALL_PREFIX=myprefix option to cmake, as is
explained in the message that cmake prints at the end.
Just like installing usual CMake projects to your machine.
The difference from directly including the /usr/include/eigne3 or /usr/local/include/eigen3 directory is that, a configuration directory called eigen3/cmake will also be installed to /usr/share or usr/local/share. This configuration directory contains the Eigen3Config.cmake file, which can automatically be found by CMake to locate the eigen3 directory.
If you have not added Eigen Library to environment variable then do the following in CMakeLists.txt:
cmake_minimum_required(VERSION 3.9)
project(ProjectName)
set(CMAKE_CXX_STANDARD 11)
# set EIGEN_DIR variable to Eigen Library Path
set(EIGEN_DIR "C:\\Eigendir\\Eigen")
# include the directory
include_directories(${EIGEN_DIR})
add_executable(ProjectName main.cpp)
target_link_libraries(ProjectName ${EIGEN_DIR})
Another simple way that doesn't require adding an environment variable is to simply find eigen with the cmake find_path function https://cmake.org/cmake/help/v3.6/command/find_path.html. The example code finds the directory "Eigen" in paths "/usr/include/" and "/usr/local/include" with an additional search in subdirectory "eigen3".
find_path(EIGEN3_INCLUDE_DIRS "Eigen" paths "/usr/include" "/usr/local/include" path_suffixes "eigen3")
message(${EIGEN3_INCLUDE_DIRS})
if ( NOT EIGEN3_INCLUDE_DIRS )
message(FATAL_ERROR "CMake variable EIGEN3_INCLUDE_DIRS not found.")
endif()
include_directories ( "${EIGEN3_INCLUDE_DIRS}" )
You could try setting the CMAKE_MODULE_PATH to the location of Eigen subdirectory named "cmake":
cmake . -DCMAKE_MODULE_PATH=<Eigen root dir>/cmake/
I had a similar problem when run cmake .. && make on Google Colab on a project clone from github. I fixed it by editing CMakeLists.txt file and adding this line to it:
set(EIGEN3_INCLUDE_DIR "/usr/include/eigen3")
As you can see, my eigen3 was in /usr/include/eigen3 path (and I had installed it using !sudo apt-get install build-essential cmake libeigen3-dev)
When installing on Kubuntu 20.04 following steps from INSTALL:
Do:
cd build_dir
cmake source_dir
make install
using -DCMAKE_INSTALL_PREFIX=/usr/local/eigen-3.4.0 and sudo
FindEigen3.cmake is not installed. However, using
set(Eigen3_DIR "/usr/local/eigen/share/eigen3/cmake")
seem to work. FindEigen3.cmake is in the build directory
but it is not copied to the installation directory tree.
This worked:
Changed c++11 to c++14
Changed find_package(Eigen3 QUIET) to find_package(Eigen3 CONFIG)
Another simple way is:
if the Eigen library is in /opt/eigen/3.3/Eigen
include_directories(/opt/eigen/3.3)
which is equivalent to what Jai suggested
set(EIGEN_DIR "/opt/eigen/3.3")
include_directories(${EIGEN_DIR})
You need to read official documentation:
Click here
After install Eigen from tar and compile it correctly.
CMakeLists.txt will looks like this:
find_package(Eigen3 3.3 REQUIRED NO_MODULE)
add_executable(${PROJECT_NAME} something.cpp)
target_link_libraries(${PROJECT_NAME} Eigen3::Eigen)
It will be fine work.