/usr/include/libqhull/DEPRECATED.txt is in libqhull-dev 2015.2-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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This directory contains the non-reentrant version of qhull, libqhull.
New code should use the reentrant version of qhull (libqhull_r).
It allows multiple instances of qhull to run at the same time. On
modern architectures, it is nearly as fast as libqhull.
Qhull programs may be built with either library. Each program has a
reentrant version (e.g., qconvex_r.c) and a non-reentrant
version (qconvex.c). The programs, rbox, qconvex, qdelaunay, qhalf,
and qvoronoi, are built with libqhull. The qhull program is built
with libqhull_r.
Qhull's C++ interface requires libqhull_r. If you previously used the
C++ interface, you will need to update your code. See Changes.txt for
suggestions.
The C code in libqhull looks unusual because of the 'qh' macro. The 'qh'
macro controls access to Qhull's global data structure, qhT. If
'qh_QHpointer' is defined, 'qh' is 'qh_qh->' and 'qh_qh' is defined as
'qhT *qh_qh', otherwise 'qh' is 'qh_qh.' and 'qh_qh' is defined as
'qhT qh_qh'.
libqhull will be supported indefinitely. The qh_QHpointer variation
of libqhull will be not be retested each release. It is replaced by
libqhull_r.
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