Missing function: gsl_multifit_wlinear

Trying to install a software package depending heavily on GSL, I get a build error complaining that this function is missing.
Building the same software works fine in 10.04 and in a fairly recent Debian Unstable.
I guess Ubuntu is using a custom packaging of GSL?

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: libgsl0ldbl 1.15+dfsg-1
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic-pae 3.0.4
Uname: Linux 3.0.0-12-generic-pae i686
ApportVersion: 1.23-0ubuntu4
Architecture: i386
Date: Mon Nov 7 14:19:48 2011
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
SourcePackage: gsl
UpgradeStatus: No upgrade log present (probably fresh install)