map download link to distname

Jonathan Stickel jjstickel at
Mon Apr 5 19:43:32 UTC 2021

I'm working on updating the graphviz portfile. The new download link is:

I can get Macports to download it by using:

distfiles     download

But the download source file is named "download". How do I rename it to 
the proper source file name "graphviz-2.47.0.tar.gz"? Forgive me if it 
is obvious, but I couldn't find this information in the documentation or 
an example in another Portfile.


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