avoid usage of Macport installed software

[Chris Jones]

> On 7 May 2015, at 5:48 pm, petr <976F at ingv.it> wrote:
> 
> 
> Hi all,
> 
> I am working on some new port. It works already quite fine, but I observe that when using it without Tracemode, it would pick up various already installed programs. Most of these are also provided by Xcode, but notably when `doxygen` is picked up, it also creates some extra documentation. This all works smoothly, but it would not create a consistent build across various installs. Is there a canonical way to avoid such problems?

If these dependencies add additional useful featured, then why not just make your port depend on the MacPorts versions of them (assuming they exist of course). Then you get the repeatable builds as well as those added features. Better yet, make those dependencies something that can be turned on and off via variants (particularly if the dependencies list is long such that you might not want them by default). Then users can decide. Of course, this also requires the ability to turn off support in your port. This is something that depends on the build system your port uses, and what options that has to do this. 

Chris
> 
> Thanks!
> ~petr
> 
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