recent jhbuild error ... clues?

[Paul Davis <paul linuxaudiosystems com>]

*** Checking out perl-xml-parser *** [10/15]
curl --continue-at - -L
http://search.cpan.org/CPAN/authors/id/M/MS/MSERGEANT/XML-Parser-2.34.tar.gz
-o /Users/paul/gtk/source/pkgs/XML-Parser-2.34.tar.gz
** Resuming transfer from byte position 321
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  223k  100  223k    0     0   188k      0  0:00:01  0:00:01 --:--:-- 1221k
*** Error during phase checkout of perl-xml-parser: file MD5 sum is
incorrect (expected 84d9e0001fe01c14867256c3fe115899, got
f2eee31e1533ad10f425ef536ca6e7e3) *** [10/15]


This was during "jhbuild build meta-gtk-osx-bootstrap"

Does anyone have any clues on the likely problem?