Too many compilers needed for C++11

[Mojca Miklavec]

Hi,

I just tried adding a cxx11 1.1 PortGroup to a port. It first failed
because clang-3.9 was missing. Once clang-3.9 was installed, the port
tried to install:

- llvm 3.7
- clang-4.0
- clang-5.0

Are there really sooooo many compilers needed for one single C++11
piece of software?

https://build.macports.org/builders/ports-10.8_x86_64_legacy-builder/builds/45715/steps/install-dependencies/logs/dependencies

Mojca