octave-forge on OSX

[Tommy Chheng]

hi,
I'm trying to install octave-forge packages on the new octave 2.9.15  
and it returns an error.
The same command was previously working in 2.9.14

octave-2.9.15:1> pkg install signal-1.0.4.tar.gz
warning: creating installation directory /Users/wheels/octave
mkoctfile: stripping disabled on this platform
mkoctfile: stripping disabled on this platform
warning: directory /Users/wheels/octave/signal-1.0.4 previously lost
error: structure has no member `archprefix'
error: evaluating argument list element number 1
error: evaluating assignment expression near line 1937, column 11
error: called from `pkg:getarchdir' in file `/Applications/Octave.app/ 
Contents/Resources/share/octave/2.9.15/m/pkg/pkg.m'
error: evaluating assignment expression near line 2017, column 12
error: evaluating for command near line 2011, column 3
error: called from `pkg:load_packages_and_dependencies' in file `/ 
Applications/Octave.app/Contents/Resources/share/octave/2.9.15/m/pkg/ 
pkg.m'
error: evaluating if command near line 762, column 3
error: called from `pkg:install' in file `/Applications/Octave.app/ 
Contents/Resources/share/octave/2.9.15/m/pkg/pkg.m'
error: evaluating switch command near line 244, column 3
error: called from `pkg' in file `/Applications/Octave.app/Contents/ 
Resources/share/octave/2.9.15/m/pkg/pkg.m'