libdf.so.4.0 or libdf.so.4 or something else ?

[Shaul Karl <shaulk@israsrv.net.il>]

[00:49:48 /tmp]$ html2ps -h
Can't load '/usr/lib/perl5/5.005/i386-linux/auto/Image/Magick/Magick.so' for 
module Image::Magick: libdf.so.4.0: cannot open shared object file: No such 
file or directory at /usr/lib/perl5/5.005/i386-linux/DynaLoader.pm line 169.

 at /usr/bin/html2ps line 453
[00:50:32 /tmp]$ ls -l /usr/lib/libdf*
lrwxrwxrwx    1 root     root           14 Oct 21 15:20 /usr/lib/libdf.so.4 -> 
libdf.so.4.1r3
-rw-r--r--    1 root     root       460812 Oct 19 21:06 /usr/lib/libdf.so.4.1r3


Is the problem that libdf.so.4 should be called libdf.so.4.0 (or vice versa) 
or is it something else ?