SDL uses incorrect thread flags

It looks like the sdl12 port is telling other SDL ports to link
against -lc_r.  This causes the infamous "spinlock called when not
threaded" problem:

kkenn_at_rot13:~ sdl11-config --libs
-L/usr/local/lib -Wl,-rpath,/usr/local/lib -lSDL-1.1 -lc_r

http://bento.freebsd.org/errorlogs/i386-5-latest/frozenbubble-0.9.3_3.log

===>  Building for frozenbubble-0.9.3_3
Fatal error 'Spinlock called when not threaded.' at line 83 in file /a/asami/portbuild/i386/5/src/lib/libpthread/thread/thr_spinlock.c (errno = 0)
Abort trap (core dumped)

    *** I need perl-SDL installed
gmake: *** [dirs] Error 1
*** Error code 2

Can someone please investigate?

Kris