Unable to install devel/bazaar with MP 1.6

[markd at macports.org]

>        Take a look at r31808 which I just committed, it turned out to be
>a
>bug in the way the Portfile was declaring its environment requirements:
>
>Correct erroneous quoting in environment variables passed to
>MacPorts. These we written with nested quoting
>as, e.g, "-L'${prefix}/lib'", but ever since Paul reworked our
>environemt parser back in 1.4.x days and then
>Anders fixed a bug in the new parser in r30273 (which happened after
>the 1.5.2 release), the '' subquoting
>level is illegal. Now a simple "-L${prefix}/lib", or even -L${prefix}/
>lib without any quoting at all, suffices.
>
>This commit fixes building and destrooting of bazaar per Adam Mercer
>(ram)'s bug on the dev list. It turned out
>to not be a regression with respect to 1.5.s as I anticipated, but
>rather and improper declaration of the environment,
>which only worked back in 1.5.2 days as a side effect of the bug
>Anders fixed in r30273, if I'm not mistaken.
>
>        Mark, would it be possible to have this (guidelines for proper
>environment declarations within a Portfile) documented somewhere in
>the guide? Thanks!
>
>        Regards,...
>
>
>-jmpp

Hi Juan,

I'm running a few months behind, but I'm not really sure how to describe
proper environment declarations generally.  What other guidelines can we
come up with besides "no double quoting"? 

Mark