/usr/lib/x86_64-linux-gnu/pkgconfig/tickit.pc is in libtickit-dev 0.2-2ubuntu2.
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 | libdir=/usr/lib/x86_64-linux-gnu
includedir=/usr/include
Name: tickit
Description: Terminal Interface Construction KIT
Version: 0.2
Libs: -L${libdir} -ltickit
Cflags: -I${includedir}
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