IEEE fixed-point package FATAL_ERROR

Hello,

Just started recently playing with a VHDL-1993 compatible fixed-point
package:
http://www.vhdl.org/vhdl-200x/vhdl-200x-ft/packages/files.html

After introducing minor modifications to the package, it compiled on
Xilinx ISE 8.1 sp3. However, now no matter how I use the function
"resize" in my code, I keep on getting this message:

FATAL_ERROR:Xst:Portability/export/Port_Main.h:127:1.16 - This
application has discovered an exceptional condition from which it
cannot recover.  Process will terminate.  To resolve this error, please
consult the Answers Database and other online resources at
http://support.xilinx.com. If you need further assistance, please open
a Webcase by clicking on the "WebCase" link at
http://support.xilinx.com

Process "Synthesize" failed

Was wondering by any chance whether anybody in here managed to go
around the issue. Any suggestions would be greatly appreciated. In the
mean time, headache is inevitable in FPGAs, alas!

Cheers,
-Manny