/usr/lib/x86_64-linux-gnu/pkgconfig/tf2_eigen.pc is in libtf2-eigen-dev 0.5.12-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Name: tf2_eigen
Description: Description of tf2_eigen
Version: 0.5.12
Cflags: -I/build/ros-geometry-experimental-pzVCU8/ros-geometry-experimental-0.5.12/tf2/include -I/build/ros-geometry-experimental-pzVCU8/ros-geometry-experimental-0.5.12/tf2_msgs/include
Libs:
Requires:
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