/usr/lib/x86_64-linux-gnu/pkgconfig/gthumb-3.6.pc is in gthumb-dev 3:3.6.1-1.
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 11 12 13 14 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu/gthumb
includedir=${prefix}/include/gthumb-3.6
extensionsdir=${prefix}/lib/x86_64-linux-gnu/gthumb/extensions
datarootdir=${prefix}/share
datadir=${datarootdir}
Name: gthumb
Description: Image viewer and browser
Version: 3.6.1
Requires: gtk+-3.0
Libs: -L${libdir}
Cflags: -I${includedir}
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