Please have a look at https://wordpress.org/plugins/pressbooks/installation/
The instructions require these "dependencies"
For PDF export install Prince (note: this is not free software) - Version 9.0
For PDF export via mPDF ensure that the following folders have write access and/or they are owned by the appropriate user.See http://codex.wordpress.org/Changing_File_Permissions for more details on adjusting file permissions.
For MOBI export install KindleGen - Version 2.9
For EPUB validation install EpubCheck - Version 3.0.1
For XML validation install xmllint - Version 20800
Certain Linux installations do not ship with the php5-xsl library enabled by default. If you attempt to export an ePub and get a either a white screen with minimal text, or a "Fatal error: Class 'XSLTProcessor' not found" error, you may need to run a command like "apt-get install php5-xsl"
1) What are "dependencies"
2) May you provide a bulleted process for installing these dependencies
3) Where exactly are they to be installed?
4) Can these be 'installed' if I use shared Linux cPanel Hosting? If so how?