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I have copied FindEigen3.cmake into my source directory. I then added: set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${CMAKE_SOURCE_DIR}) to my CMakeLists.txt to tell CMake to use this .cmake file. Then in my CMakeLists.txt I do: FIND_PACKAGE(Eigen3) I have the environent variable EIGEN3_INCLUDE_DIR set to /home/doriad/src/eigen When I run CMake, I get: -- Could NOT find Eigen3 (missing: EIGEN3_INCLUDE_DIR EIGEN3_VERSION_OK) (Required is at least version "2.91.0") This is a fresh clone from Mercurial, so the version should be at least 3. Any suggestions? If I set the module path INCORRECTLY, I get some clues: Adjust CMAKE_MODULE_PATH to find FindEigen3.cmake or set Eigen3_DIR to the directory containing a CMake configuration file for Eigen3. The file will have one of the following names: Eigen3Config.cmake eigen3-config.cmake However, I didn't find either of those files in either the source dir or build dir of Eigen3. I tried to set Eigen3_DIR=/home/doriad/src/eigen, but that didn't work either. Thoughts? Thanks, David

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