/usr/lib/x86_64-linux-gnu/pkgconfig/ck.pc is in libck-dev 0.3.5-1.
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 10 | prefix=/usr
includedir=/usr/include
libdir=/usr/lib/x86_64-linux-gnu
Name: Concurrency Kit
Description: Toolkit for well-specified design and implementation of concurrent systems
URL: http://concurrencykit.org/
Version: 0.3.5
Libs: -L${libdir} -lck
Cflags: -D__x86_64__ -I${includedir}
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