/usr/lib/x86_64-linux-gnu/pkgconfig/xatracker.pc is in libxatracker-dev-lts-raring 9.1.4-0ubuntu0.1~precise2.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: xatracker
Description: Xorg Gallium3D acceleration library
Version: 1.0.0
Libs: -L${libdir} -lxatracker
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