[PATCH] Add FastTree

[Ben Woodcroft]

Hi,

I was a bit confused the best way to package FastTree as it is so simple 
- the install instructions just give how to run gcc and I couldn't find 
anything similar (enough for me) in other .scm files.

I'm also not clear which version of gcc should be chosen - I chose 5.1 
as it was new, but it also compiles with other versions.

During development of this patch I noticed badly specified system* does 
not throw an error - is there a way to do this so?

And more generally, there's no equivalent of make check here, should one 
be manually specified?

Thanks,
ben

0001-gnu-Add-fasttree.patch
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