Error: llvm-3.1 is not supported on Mavericks or later.

[Ryan Schmidt]

On Aug 29, 2014, at 5:59 AM, David Nicholls wrote:
> 
> Doing a macports install after upgrading to Mavericks, and the above error is reported.
> 
> Since quite a lot of important stuff depends on this, how do I work around it?

Nothing depends on llvm-3.1, except clang-3.1:

$ port echo depends:llvm-3.1
clang-3.1                       

These are old versions of clang and llvm, superseded by newer versions which you should use instead. 

If on your system things seem to depend on llvm-3.1, examine the variants of your installed ports. Specifically, you may have ld64 and/or cctools installed with the +llvm31 variant. If so, reinstall those ports with newer llvm variants instead.