/usr/lib/pkgconfig/x52pro.pc is in libx52pro-dev 0.1.1-2.3build1.
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
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include
Name: libx52pro
Description: MFD and LED configuration library for the Saitek X52 Pro Joystick
Version: 0.1.1
Libs: -L${libdir} -lx52pro
Cflags: -I${includedir}
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