Ports and their dependencies (run deps and also versioning questions)

[Tabitha McNerney]

On 6/6/08, Joshua Root <jmr at macports.org> wrote:
>
> Tabitha McNerney wrote:
>
>> But, then my script ran into this specific problem:
>>
>> $ port info --depends_lib speex @1.0.5
>>
>> -->
>>
>> depends_lib: lib:libogg:libogg
>>
>> Hmmm ... the repeat of the library dependency libogg looks to be
>> incorrect.
>> Also, the first instance of the libogg dependency is preceded by "lib:"
>> but
>> shouldn't that be "port:" instead?
>>
>
> This is not an error, but a different type of dependency. A "port:foo"
> dependency means "install the port named 'foo'", whereas "lib:foo:bar" means
> "check if the library 'foo' is present, and if not, install the port named
> 'bar'". You can also use 'bin' or 'path' instead of 'lib' to make the port
> installation conditional on the absence of executables and arbitrary files,
> respectively.
>
> This is only mentioned in passing in the guide: <
> http://guide.macports.org/#reference.dependencies.types>. It's documented
> a little better in the portfile(7) manual.
>
> Most of the time dependencies should be of the port: variety, but sometimes
> it is better/easier to use software that Apple ships with OS X, a common
> example being X11. You'll see lib:libX11.6:XFree86 in a lot of portfiles.


Thanks Josh, for pointing that sliver of documentation out (I should have
found it after Rainer shed light on $ port info ... ).


- Josh
>
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