Re: Warning: Configuration logfiles contain indications of -Wimplicit-function-declaration; check that features were not accidentally disabled:

[Joshua Root]

We have a wiki page with an in-depth explanation of what this warning 
means: <https://trac.macports.org/wiki/WimplicitFunctionDeclaration>

The executive summary for end users is that this is something that the 
port's maintainer needs to look into, so you can file a ticket about it, 
but it may or may not indicate a significant problem.

- Josh