/usr/lib/x86_64-linux-gnu/pkgconfig/libsoup-gnome-2.4.pc is in libsoup-gnome2.4-dev 2.48.0-1+deb8u1.
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=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: libsoup
Description: a glib-based HTTP library
Version: 2.48.0
Requires: libsoup-2.4
Libs: -L${libdir} -lsoup-gnome-2.4
Cflags: -I${includedir}/libsoup-gnome-2.4
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