/usr/lib/pkgconfig/printproto.pc is in x11proto-print-dev 1.0.5-2.
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=${prefix}/include
Name: PrintProto
Description: Print extension headers
Version: 1.0.4
Requires: xau
Cflags: -I${includedir}
|