GSL in ROOT 5

Hi,
I have ROOT ver. 5 installed and I have been using some of the GSL capabilities by loading the libMathMore and calling the required function as ROOT::Math:func. I have succeded in using some of the functions. I have however tried to us the Kummer function: gsl_sf_hyperg_U*
*but it doesn't seem to be included. I was of the impression that ROOT 5 has the whole of the GSL capabilites included, is this right? Is it possible to included this separately or better still, is there a way to for me to include all the GSL capabilities into ROOT 5?

Thanks.

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