did gsl_multifit_linear_svd change at some point after GSL 1.16? I couldn't
see any mention of it in the NEWS file, but a user reported to me that my
code doesn't compile anymore with GSL 2.1.
Could someone add this somewhere in the NEWS file?
Moreover, does someone know how I can use conditionals with the Autotools
(via ./configure) so that, if the user has GSL <= 1.16, the compiled code
uses gsl_multifit_linear_svd whereas if the user has GSL >= 2.0 the
compiled code uses gsl_multifit_linear?