'etc' and 'var' equivalents?

I get the feeling I'm overlooking something obvious, but I don't know 
what it is.

A typical UNIX application will be installed something like:
    binaries:      /usr/bin
    man pages:     /usr/man
    config files:  /etc
    data;state:    /var

MakeMaker supports various "INSTALL...BIN..." and "INSTALL...MAN..." 
options to adjust the locations of the "binaries" and "man pages" 
aspects of the application.  That's fine; I'm happily using those.

But I can't see how to specify the "config files" and "data;state" aspects.

Any thoughts on what I have missed?  Or hints or good-practice-tips on 
how to specify to MM the application's config and state directories?

-- 
: David Lee
: ECMWF (Data Handling System)
: Shinfield Park
: Reading  RG2 9AX
: Berkshire
:
: tel:    +44-118-9499 362
: email:  [email protected]