/usr/lib/pkgconfig/libwnck-1.0.pc is in libwnck-dev 2.30.7-2.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include
Name: libwnck
Description: Window Navigator Construction Kit library
Version: 2.30.7
Requires: glib-2.0 gobject-2.0 gtk+-2.0
Requires.private: x11 pango cairo libstartup-notification-1.0 xres
Libs: -L${libdir} -lwnck-1
Cflags: -I${includedir}/libwnck-1.0
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