/usr/lib/cmake/eigen3/UseEigen3.cmake is in libeigen3-dev 3.3~beta1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | # -*- cmake -*-
#
# UseEigen3.cmake
add_definitions ( ${EIGEN3_DEFINITIONS} )
include_directories ( ${EIGEN3_INCLUDE_DIRS} )
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