/usr/lib/x86_64-linux-gnu/pkgconfig/sdformat.pc is in libsdformat6-dev 6.0.0+dfsg-4.
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"
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: SDF
Description: Robot Modeling Language (SDF)
Version: 6.0.0
Requires: ignition-math4
Libs: -L${libdir} -lsdformat
CFlags: -I${includedir}/sdformat-6.0 -std=c++11
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