ImageMagick on 5.2-RC1 fails with pthread error (libkse)

Getting the following when trying to compile ImageMagick-5.5.7.14 on
FreeBSD 5.2-RC1, I don't think it's an issue with libkse specifically
though..

Making all in utilities
gmake[1]: Entering directory
`/usr/ports/graphics/ImageMagick/work/ImageMagick-5.5.7/utilities'
/bin/sh ../libtool --silent --mode=link cc  -O -pipe -lc_r
-funroll-loops -DVM_STACK -march=pentium4 -Wall  -L/usr/local/lib -lc_r
-L/usr/X11R6/lib -L/usr/local/lib -L/usr/local/lib -o composite
-L/usr/local/lib -lc_r -L/usr/X11R6/lib -L/usr/local/lib
-L/usr/local/lib composite.o ../magick/libMagick.la  
/usr/local/lib/libjasper.so: warning: tmpnam() possibly used unsafely;
consider using mkstemp()
../magick/.libs/libMagick.so: undefined reference to `pthread_equal'
gmake[1]: *** [composite] Error 1
gmake[1]: Leaving directory
`/usr/ports/graphics/ImageMagick/work/ImageMagick-5.5.7/utilities'
gmake: *** [all-recursive] Error 1
*** Error code 2


Any thoughts?