/usr/include/paw/tree.h is in libpawlib-lesstif3-dev 1:2.14.04.dfsg.2-7ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | /* Stub file for API backwards compatibility */
#include <X11/Xaw/Tree.h>
|