autoconf and llvm version detection

Hi,

I am using llvm as a lib in my project.
I use ./configure to configure my project before it compiles.
Is there an autoconf .m4 script I can add to my project that I can use
in my ./configure that will check if llvm is installed and also check
what version of llvm is installed.

Kind Regards

James

Not that I know of, sorry.

-eric