Hi Steve, > What I don't know is how to tell the gsl build mechanism to use that compiler
Does the discussion here help? http://stackoverflow.com/questions/6796982/clang-and-the-default-compiler-in-os-x-lion That is, export CC=clang followed by the usual ./configure && make && make check. Since Apple seems to be going away from GCC, and if clang does work, I'd appreciate anyone's thoughts on tweaking configure.ac to prefer clang on OS X. A quick Google indicates the two are ABI compatible. And we do get a deluge of OS X-related problems here. Maybe with this solved we can get the hypergeometric 2F1 going again. - Rhys
