'Best Practices' for downloads ??

[linuxmaillists at charter.net]

> http://www.pathname.com/fhs/

I went to the above URL what exactly are they talking about 
when they say: if the corresponding subsystem is installed

See the copy pasted below

Requirements

The following directories, or symbolic links to directories, 
are required in /.

Directory	Description
bin	Essential command binaries
boot	Static files of the boot loader
dev	Device files
etc	Host-specific system configuration
lib	Essential shared libraries and kernel modules
media	Mount point for removeable media
mnt	Mount point for mounting a filesystem temporarily
opt	Add-on application software packages
sbin	Essential system binaries
srv	Data for services provided by this system
tmp	Temporary files
usr	Secondary hierarchy
var	Variable data

Each directory listed above is specified in detail in 
separate subsections below. /usr and /var each have a 
complete section in this document due to the complexity of 
those directories.
Specific Options

The following directories, or symbolic links to directories, 
must be in /, if the corresponding subsystem is installed:

Directory	Description
home	User home directories (optional)
lib<qual>	Alternate format essential shared libraries 
(optional)
root	Home directory for the root user (optional)

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