Grargh! #Solaris#tar hates #GNU extensions. And #cpanm can't be configured to specifically use #gtar instead of whatever tar it finds first in the path.
@BRicker I don't think it's really diverged much. #SunMicrosystems begat #OpenSolaris. Then Oracle unbegat it and the community begat #IllumOS by forking the last free release. There are then a bunch of distributions like #OmniOS and #Tribblix.