getting weird error when building clang from source

[Little Bobby Tables]

so i tried the official #llvm irc channel, but they couldnt help, so im hoping you guys can. my issue is this: i am using this site to build clang: http://clang.llvm.org/get_started.html I know it works, because ive used it before. anyways, i was building clang and i only had to make (I am on Linux Mint) but then i went to work. my machine froze up in the middle of the building, so i just turned it off, deleted my build/svn-generated folders and started fresh. it all went fine until i ran configure at which point it gave this error:

checking for clang... clang
checking for C compiler default output file name... b.out
checking whether the C compiler works... configure: error: cannot run C compiled programs.
If you meant to cross compile, use `--host'.
See `config.log' for more details.

im not quite sure how to fix this. any help?