/usr/lib/x86_64-linux-gnu/pkgconfig/cairomm-ps-1.0.pc is in libcairomm-1.0-dev 1.12.2-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | Name: cairomm-ps
Description: C++ wrapper for cairo - postscript support
Requires: cairomm-1.0 cairo-ps
Version: 1.12.2
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