Unable to find Eigen3 with CMake

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Turning my comment into an answer

The find package scripts – like FindEigen3.cmake – normally use the find_path() command to detect the package’s include directory (see it’s documentation for the full details).

FindEigen3.cmake uses the following code snippet:

find_path(EIGEN3_INCLUDE_DIR NAMES signature_of_eigen3_matrix_library
    PATHS
    ${CMAKE_INSTALL_PREFIX}/include
    ${KDE4_INCLUDE_DIR}
    PATH_SUFFIXES eigen3 eigen
)

So it looks in CMAKE_INSTALL_PREFIX which on Unix/Linux hosts is /usr/local by default.

The following has worked for me:

  • Go to the Eigen source directory and run the CMake and installation steps

    > mkdir build
> cd build
> cmake ..
> make install

  • Then copy – as you have done – FindEigen3.cmake to your projects source directory.

  • Now your code does find Eigen (just changed to list(APPEND ...))

    list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}")
find_package(Eigen3 REQUIRED)

References

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