/usr/lib/pkgconfig/libicns.pc is in libicns-dev 0.7.1-1.1.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include
Name: libicns
Description: Loads and saves Macintosh icns files
Version: 0.5.9
Libs: -L${libdir} -licns
Cflags: -I${includedir}
|