/usr/lib/x86_64-linux-gnu/pkgconfig/garcon-gtk3-1.pc is in libgarcon-gtk3-1-dev 0.6.1-2.
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 11 12 13 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
garcon_api_version=1
Name: garcon
Description: Freedesktop.org compliant menu library
Requires: garcon-1 gtk+-3.0 libxfce4ui-2
Version: 0.6.1
Libs: -L${libdir} -lgarcon-gtk3-${garcon_api_version}
Cflags: -I${includedir}/garcon-gtk3-${garcon_api_version}
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