/usr/lib/x86_64-linux-gnu/pkgconfig/ignition-common1.pc is in libignition-common-dev 1.0.1-1.
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 11 12 | prefix=/usr
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include/ignition/common1
Name: Ignition common
Description: A set of common classes for robot applications
Version: 1.0.1
Requires: ignition-math4 uuid gts libswscale libavdevice >= 56.4.100 libavformat libavcodec libavutil
Requires.private: tinyxml2
Libs: -L${libdir} -lignition-common1
Libs.private: -ldl
CFlags: -I${includedir}
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