/usr/lib/pkgconfig/gxw.pc is in libgxw-dev 0.36.1-1.
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 15 | prefix=/usr
exec_prefix=${prefix}
libdir=/usr/lib
datarootdir=${prefix}/share
datadir=${datarootdir}
includedir=${prefix}/include
Name: gxw+
Description: Additional widgets for the GTK toolkit
Version: 1
URL: http://www.gtk.org/
Requires: gtk+-2.0 >= 2.24.0
Libs: -L${libdir} -lgxw
Cflags: -I${includedir}/gxw
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