[Help-gsl] Help with multi-parameter fitting

[Giacomo Piva]

Hi all,
I'm using gsl 1.13 on ubuntu 10.04
I'm trying to use gsl_multifit_linear_* functions but I can't since they 
missing in the gsl_fit.h include file.
My question is why they missing? Is there some change not mentioned in 
the documentation?
I found reference to gsl_fit.h here: 
http://www.gnu.org/software/gsl/manual/html_node/Least_002dSquares-Fitting.html

Thanks to all

--
Giacomo