pkg.m : support for url transfers was disabled when Octave was built (?)

[Julien Bect]

Dear Maintainers,

I get the following error on a fresh build of Octave 3.9.0+ 
(a2294cc6e027) on Ubuntu 13.04 :

>> pkg -forge install signal
error: support for url transfers was disabled when Octave was built
error: called from:
error:   /usr/local/share/octave/3.9.0+/m/pkg/pkg.m at line 386, column 23

This is the first time that I see this error, and I haven't changed 
anything in my build process (configure is called without options, and 
doesn't report any missing library).

Am I missing something ? Should I file a bug report ?

@++
Julien