/usr/lib/x86_64-linux-gnu/pkgconfig/libinfgtk3-0.6.pc is in libinfinity-0.6-dev 0.6.7-1build1.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
gtk_version=3
Name: libinfgtk
Description: Common infinote GTK+ UI functionality
Requires: libinfinity-0.6 gtk+-3.0 >= 2.90.6
Version: 0.6.7
Libs: -L${libdir} -linfgtk3-0.6
Cflags: -I${includedir}/libinfgtk3-0.6
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