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Orivej Desh 023e54404c eigen3_3: fix EIGEN3_INCLUDE_DIR location (#50628)
Eigen assumes that CMAKE_INSTALL_INCLUDEDIR is a path relative to
CMAKE_INSTALL_PREFIX (typically "include"), but CMake supports it being an
absolute path, which is the case in Nixpkgs. This resulted in EIGEN3_INCLUDE_DIR
being set to "/nix/store/…eigen…//nix/store/…eigen…/include/eigen3".

GNUInstallDirs_get_absolute_install_dir requires CMake 3.7.
2018-11-18 21:30:07 +00:00