MMBase uses ImageMagick's convert tool to build and convert its images.
ImageMagick is already part of the Red Hat distribution. Check its availability using:
| rpm -q ImageMagick | 
If ImageMagick is not available on your system, install it using up2date:
| up2date | 
or download it from the Red Hat Network:
| https://rhn.redhat.com/ | 
and install it by hand:
| rpm -ihv ImageMagick-xxx.rpm |