gentoo/wget fails during 'emerge system' (ipv6 enabled)

[ari <edelkind-debug@episec.com>]

'emerge system' fails with the following wget error:

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--14:09:59-- ftp://ftp.win.tue.nl/pub/home/aeb/linux-local/utils/kbd/kbd-1.08.tar.gz
  (try: 5) => `/usr/portage/distfiles/kbd-1.08.tar.gz'
Connecting to ftp.win.tue.nl[131.155.71.89]:21... failed: Address family not supported by protocol.
Giving up.

!!! Couldn't download kbd-1.08.tar.gz. Aborting.
----------------------------------------------------------

I have 'ipv6' listed in the USE variable; this is a likely contributor
to the problem, coupled with limited ipv6 support in wget.

Researching.

ari