/usr/lib/x86_64-linux-gnu/pkgconfig/libbtbb.pc is in libbtbb-dev 2015.09.R2-1.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: Bluetooth Baseband Library
Description: C Utility Library
Version: 0.3
Cflags: -I${includedir}/
Libs: -L${libdir} -lbtbb
Libs.private:
|