can't exclude sub-dir

Hi
(please cc:, i'm not subscribed)

Problem:
i use '(l)arch' as revision control.
It creates a subdir {arch} in working dir.

~/globalrc contains:
:skip=SCCS/, .. ,"\{arch\}/":\

Executing 'gtags' gives:
gtags: cannot compile regular expression.

Tried various combination of quoting/escaping in
.globalrc (e.g. '{arch}/' \"\{arch\}/\" ..)
always throwing the same error.

Did i simply miss the working quoting?
Or is impossible to use {} in skip?

thanks in advance,
 T.G