See attached build log.
(Please do not complain about the need for looking at the build log until you can provide an easy way to open bugs with the correct data picked out of a tinderbox log. Thanks.)
Created attachment 242043 [details]
Created attachment 249732 [details, diff]
simple sed rule to insert LDFLAGS
Tested by compiling on amd64.
Funny thing how differently C(XX)FLAGS (and now LDFLAGS) have been sorted out in bsd-games and bsd-games-non-free. They seem to have very similar build systems, yet the bsd-games ebuild uses blunt sed'ing, while bsd-games-non-free uses emake parameters.
Thanks for report and patch