environment variables per port

[Dmitry Banschikov]

Hello.

I need to setup environment variables per individual port. In 
particular, I need this feature for building only one package with 
variable WITH_DEBUG set to "yes". Documentation says [1], that 
environment variables can be enabled global, for build, jail or 
portstree, but no mention about using variables on per package basis. Is 
this functional unsupported? Or, there is a more convenient way for 
doing this?



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Dmitry Banschikov