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BUILD.md

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 # How to turn these files into a book
 
 In this repostitory, you will find the chapters written in 
-[Markdown](https://daringfireball.net/projects/markdown/). Markdown files are pretty readable, but
-you may well want to convert the source files into other formats. There is a Makefile that you
-can use you do thay, but you will need various other tools installed. This file explains which
-tools are required, what they are required for and how o get them.
+[Markdown](https://daringfireball.net/projects/markdown/). Markdown files are
+pretty readable, but you may well want to convert the source files into other
+formats. There is a Makefile that you can use you do thay, but you will need
+various other tools installed. This file explains which tools are required,
+what they are required for and how o get them.
 
 ## Make
 
-[Make](https://en.wikipedia.org/wiki/Make_%28software%29) is the standard Unix tool for controlling
-how to build files from other files. If you're using a system based on Unix (that includes Linux,
-BSD and OSX) then you will almost certainly alread have Make installed. If you're using Windows,
-then I think that Microsoft have a similar tool called `nmake` which you can almost certainly
-download from one of their many web sites.
+[Make](https://en.wikipedia.org/wiki/Make_%28software%29) is the standard Unix
+tool for controlling how to build files from other files. If you're using a
+system based on Unix (that includes Linux, BSD and OSX) then you will almost
+certainly alread have Make installed. If you're using Windows, then I think
+that Microsoft have a similar tool called `nmake` which you can almost
+certainly download from one of their many web sites.
 
 ## Pandoc
 
-The first file that we need to generate is the [EPUB](https://en.wikipedia.org/wiki/EPUB) version
-of the book. And for that we use a tool called [Pandoc](http://pandoc.org/). This almost certainly
+The first file that we need to generate is the
+[EPUB](https://en.wikipedia.org/wiki/EPUB) version of the book. And for that
+we use a tool called [Pandoc](http://pandoc.org/). This almost certainly
 won't already be installed on your system.
 
-For Linux users, Pandoc will be available in your system's package repository. If you're using
-a RedHat/Fedora/Centos system you can install it with `sudo install pandoc`. For a Debian/Ubuntu
-system, the equivalent command is `sudo apt-get install pandoc`. If you're using any other kind of
-Linux then I'm sure you're clever enough to work out the equivalent command,
+For Linux users, Pandoc will be available in your system's package repository.
+If you're using a RedHat/Fedora/Centos system you can install it with `sudo
+install pandoc`. For a Debian/Ubuntu system, the equivalent command is `sudo
+apt-get install pandoc`. If you're using any other kind of Linux then I'm sure
+you're clever enough to work out the equivalent command.
 
-For OSX and Windows users, there are installable packages of the latest version of Pandoc available
-from their [Github repository](https://github.com/jgm/pandoc/releases/latest). Simply download the
-correct file and double-click it.
+For OSX and Windows users, there are installable packages of the latest
+version of Pandoc available from their
+[Github repository](https://github.com/jgm/pandoc/releases/latest). Simply
+download the correct file and double-click it.
 
-Once you have Make and Pandoc installed, you can build an EPUB of the book by opening a terminal,
-changing to the directory where you have checked out a copy of this repository and typing:
+Once you have Make and Pandoc installed, you can build an EPUB of the book by
+opening a terminal, changing to the directory where you have checked out a
+copy of this repository and typing:
 
     make epub
 
 Or, even, just:
 
     make
 
-You will end up with a file called perlwebbook.epub which can be used in many ebook systems.
+You will end up with a file called perlwebbook.epub which can be used in many
+ebook systems.
 
 ## Kindlegen
 
-If you want to generate a copy of the book which you can read on an Amazon Kindle, then you
-need to go a step further an generate a [MOBI](https://en.wikipedia.org/wiki/Mobipocket) version
-of the file. We do this using a program called Kindlegen which Amazon makes available for many
+If you want to generate a copy of the book which you can read on an Amazon
+Kindle, then you need to go a step further and generate a
+[MOBI](https://en.wikipedia.org/wiki/Mobipocket) version of the file. We do
+this using a program called Kindlegen which Amazon makes available for many
 different platforms. You can download the program
 [from their web site](http://www.amazon.com/gp/feature.html?docId=1000765211).
 
-Once you have installed Kindlegen, you can generate your MOBI file by opening a terminal, changing
-to the directory where you have checked out a copy of this repository and typing:
+Once you have installed Kindlegen, you can generate your MOBI file by opening
+a terminal, changing to the directory where you have checked out a copy of
+this repository and typing:
 
     make mobi
 
-**Note:** The MOBI is generated by converting the EPUB. So running `make mobi` will automatically
-run `make epub` first, which means that you will also need to install Pandoc as described above.
+**Note:** The MOBI is generated by converting the EPUB. So running `make mobi`
+will automatically run `make epub` first, which means that you will also need
+to install Pandoc as described above.
 
 ## Calibre
 
 Sometimes you don't want a real ebook version of the book. Sometimes just a
-[PDF](https://en.wikipedia.org/wiki/Portable_Document_Format) is enough. So our Make system
-supports building a PDF too.
+[PDF](https://en.wikipedia.org/wiki/Portable_Document_Format) is enough. So
+our Make system supports building a PDF too.
 
-Building a PDF uses another tool called [Calibre](http://calibre-ebook.com/) which you will need to
-install if you want to make a PDF.
+Building a PDF uses another tool called [Calibre](http://calibre-ebook.com/)
+which you will need to install if you want to make a PDF.
 
-For Linux users, Calibre will be available in your system's package repository. If you're using
-a RedHat/Fedora/Centos system you can install it with `sudo install calibre`. For a Debian/Ubuntu
-system, the equivalent command is `sudo apt-get install calibre`. If you're using any other kind of
-Linux then I'm sure you're clever enough to work out the equivalent command,
+For Linux users, Calibre will be available in your system's package repository. 
+If you're using a RedHat/Fedora/Centos system you can install it with `sudo
+install calibre`. For a Debian/Ubuntu system, the equivalent command is `sudo
+apt-get install calibre`. If you're using any other kind of Linux then I'm
+sure you're clever enough to work out the equivalent command,
 
-For OSX and Windows users, there are installable packages of the latest version of Calibre available
-from their [web site](http://calibre-ebook.com/download). Simply download the correct file and
-double-click it.
+For OSX and Windows users, there are installable packages of the latest
+version of Calibre available from their
+[web site](http://calibre-ebook.com/download). Simply download the correct
+file and double-click it.
 
-Once you have Calibre installed, you can build a PDF of the book by opening a terminal, changing to
-the directory where you have checked out a copy of this repository and typing:
+Once you have Calibre installed, you can build a PDF of the book by opening
+a terminal, changing to the directory where you have checked out a copy of
+this repository and typing:
 
     make pdf
 
-**Note:** The PDF is generated by converting the EPUB. So running `make mobi` will automatically
-run `make epub` first, which means that you will also need to install Pandoc as described above.
+**Note:** The PDF is generated by converting the EPUB. So running `make mobi`
+will automatically run `make epub` first, which means that you will also need
+to install Pandoc as described above.
 
 ## Conversion Process
 
-This section summarises the software needed to convert the input files into various output files.
+This section summarises the software needed to convert the input files into
+various output files.
 
 * This repository contains the book's sources in Markdown format.
 * An EPUB is created from the Markdown using Pandoc