[56254] trunk/dports/python

[Ryan Schmidt]

On Aug 25, 2009, at 17:08, James Kyle wrote:

>> Default variants are difficult for the user to turn off. If you  
>> want these features enabled by default, why not delete the  
>> variants and just make the port always build them?
>>
>> If there really is value in allowing the user to disable these  
>> features, make them "no_" variants, e.g. "no_pywavelet",  
>> "no_libsvm", etc.
>
> Sounds good.
>
>
>> Variants must do more than just add a dependency. They must also  
>> inform the software it is ok to use that dependency -- like you  
>> did in this variant:
>
> the package will use the above libraries if they are present, but  
> not if they are not. the variant allows the user to pull them into  
> the build process and so enable support. So the informing is  
> effectively done automatically as long as the library is installed.

This means the port would use those libraries even if the  
corresponding variant was not selected. This is not ok. The port must  
tell the software it is not ok to use those libraries unless the  
variant is selected.