/usr/share/pkgconfig/eigen3.pc 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 7 8 9 | prefix=/usr
exec_prefix=${prefix}
Name: Eigen3
Description: A C++ template library for linear algebra: vectors, matrices, and related algorithms
Requires:
Version: 3.2.92
Libs:
Cflags: -I${prefix}/include/eigen3
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