After installing the latest ImageMagick (6.4.2), an error occured on MovableType image upload interface. The error said "/usr/local/lib/libMagickCore.so.1 Undefined symbol "pthread_equal".

A web source tells it causes because of misconfigure on some version of FreeBSD (I guess 5.x or earlier version. It works fine on my 6.2.)

An easy solution is disable "thread".
Try it on configure process.

# ./configure --without-threads