LICENSE as a conditional list

["Filip Hajny" <filip%joyent.com@localhost>]

Hi guys,

would this be considered invalid?

.if !empty(PKG_OPTIONS:Mextra)
LICENSE+=               AND extra-license
CONFIGURE_ARGS+=        --with-extra
.endif

Pkglint complains, but it seems to be doing the right thing. Obviously useful 
for when throwing in some extra code adds in a new license.

-F