/usr/lib/pkgconfig/gnome-scan.pc is in libgnomescan-dev 0.6.2-1.1ubuntu4.
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=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include
Name: Gnome Scan
Description: Scan backend and frontend for the Gnome desktop
Version: 0.6.2
Requires: gimpui-2.0 >= 2.2 gmodule-2.0 gegl-0.2 >= 0.0.12 gthread-2.0
Libs: -L${libdir} -lgnomescan
Cflags: -I${includedir}/gnome-scan-1.0
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