Hi,

I have been wondering what the differences are between variables that 
are defined using "# defined" and variables that have a value "yes/no".

That's what I found out:

* A yesno variable should be checked using empty(${VAR:M[Yy][Ee][Ss]).
* if it is undefined, a warning occurs.

It's because this code snippet looks inconsistent:

USE_BUILDLINK3=         yes
USE_PKGLOCALEDIR=       # defined
USE_X11=                # defined

I would like to see a guideline for when to use "yes/no" and when 
"#defined". Perhaps pkglint could then check for correct usage. Oh, by 
the way, my patch for pkglint (25222) has not yet been submitted. Is it 
too bad? ;)

http://www.netbsd.org/cgi-bin/query-pr-single.pl?number=25222

Roland