In order to avoiding forcing the installation of `asciidoctor-pdf`, only the source asciidoc file is installed.

`w1retap` [user guide](w1retap.adoc), `asciidoc` format.

A Makefile exists here to build the user guide.

The PDF may be generated by:

```
asciidoctor-pdf w1retap.adoc
```

or (styled, optimised), recommended:

```
make
```

The `Makefile` generated a PDF; optionally an optimised PDF (optimised requires `hexapdf`, `sudo gem install --no-user-instal  hexapdf`).

In addition to the default `pdf` target, the `Makefile` also offers a `html` target.

```
make html
```
