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

I needed a CPAN module "File::Basename 2.76" (It seemed to be included from perl version 5.10.0), so upgraded perl to version 5.10.0.

As a result, MovableType4.1 got an error in its library.

(Got an error: Can't locate object method "configure" via package "MT::ObjectDriverFactory" at lib/MT.pm line 877.)

I removed 5.10.0 and switched it back to 5.8.8.

MT4.1 is not incompatible with perl5.10.0 at this moment.