/usr/lib/x86_64-linux-gnu/pkgconfig/libshairport.pc is in libshairport-dev 1.2.1~git20120510.cbed0c1-3.
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 12 | # libshairport pkg-config file
prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: libshairport
Description: airport implementation
Version: 1.2.1
Libs: -L${libdir} -lshairport
Cflags: -I${includedir}
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