Including library with cmake manually

Question

In the cluster of my uni I do not have sudo rights, and I need the version Eigen3 3.3.3 and they only offer Eigen 2.8 installed.

Now, I uploaded the source files of Eigen3 3.3.3 and tried to manually hook it up with cmake .

Then I set the environmental variable CPLUS_INCLUDE_PATH accordingly. In cmake I have set the requirements as:

find_package(Eigen3 3.3.3 REQUIRED)
include_directories(${EIGEN3_INCLUDE_DIR})

But I get this error message:

By not providing "FindEigen3.cmake" in CMAKE_MODULE_PATH this project has asked CMake to find a package configuration file provided by "Eigen3", but CMake did not find one.

Could not find a package configuration file provided by "Eigen3" (requested version 3.3.3) with any of the following names:

---

I don't understand why I have to manually provide a FindEigen3.cmake file? Usually, one has not to do it. How to solve this error? I do not want to manipulate the existing CMakeList.txt . Thanks.

Answer 1

Turning my comments into an answer

The library brings its own CMake configuration script . The CMake needs a hint where your Eigen3 library is to configure it correctly (see cmake/FindEigen3.cmake ).

So you can define the search path in your cmake command line call:

cmake -DCMAKE_MODULE_PATH:PATH=/path/to/Eigen3/cmake ..

References

• Unable to find Eigen3 with CMake
• Could not find CMake package configuration file for "Eigen3"