/usr/lib/x86_64-linux-gnu/pkgconfig/libbt.pc is in libbt-dev 0.70.1-36.
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 | prefix=/usr
exec_prefix=${prefix}
includedir=${prefix}/include
libdir=${prefix}/lib/x86_64-linux-gnu
Name: Blackbox Toolbox
Description: Utility class library for writing small applications
Version: 0.70.1
Requires.private: xft >= 2.0.0
Libs: -L${libdir} -lbt -Wl,-Bsymbolic-functions -Wl,-z,relro -Wl,-z,now -L/usr/lib
Cflags: -I${includedir}/bt
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