Issue with understanding Boost Tutorial Pages

From: Aditya P (pssanth3745_at_[hidden])
Date: 2020-02-24 16:02:29

I've been trying to run a few Examples like Gradient,Convolution which are
provided in Boost Tutorial Pages.
However, I could not understand what these lines always give me error like
(FILENAME EXPECTED). Also I couldn't understand what those meant.

#include <boost/gil.hpp>
#include &lt;<a
href="../../../../../boost/gil/extension/io/jpeg.hpp">boost/gil/extension/io/jpeg.hpp</a>&gt;
#include &lt;<a
href="../../../../../boost/gil/extension/numeric/sampler.hpp">boost/gil/extension/numeric/sampler.hpp</a>&gt;
#include &lt;<a
href="../../../../../boost/gil/extension/numeric/resample.hpp">boost/gil/extension/numeric/resample.hpp</a>&gt;

I couldn't find any samples of complete boost gil programs online except
the test program which tested my boost installation.