Requirements for Running LilyPond

[James]

Hello,

This subsection has always puzzled me a bit.

http://lilypond.org/doc/v2.19/Documentation/contributor-big-page#requirements-for-running-lilypond

If I were a user on Windows or MacOS I know I don't need any of this 
software to 'run' LilyPond because, I assume, we provide everything in 
the standalone binaries we compile for these operating systems.

I had initially thought this section should be moved to 'Usage' under 
the 'Running LilyPond' section but after reasoning as I have above it 
evidently is not appropriate there.

So is this section just for Linux (and maybe FreeBSD) users?

Or is this section just for users that are building from source AND want 
to run LilyPond at the same time?

In which case what do I get when I am on Linux and download one of the 
*.sh files that I then run to 'install' LilyPond?

Thanks for your time.

James