Compile the fonts into Exceed format. Please consult the following FAQ from Hummingbird's web site.
http://www.hummingbird.com/support/nc/exceed/ex6_unixfonts.html
Along with this information, you will also need to turn Font Substitution off.
If you are having any problems compiling the MathFonts in Exceed Version 6.0.2, please read the following FAQ.
http://support.wolfram.com/mathematica/systems/unix/interface/exceed6.html
If you have any other problems with Exceed, please contact Hummingbird directly.
http://www.hummingbird.com/support/
Questions or comments? Send email to support@wolfram.com.