Building an EXE using PXML

I've been trying to build a package that includes the line
(require :pxml) 

In one of its files.  When I do not include this file my program will
compile (although without the functionality I need).  When I do include
this file I get the following lines at the end of the compilation
attempt, after which the compile fails.

; Fast loading C:\Program Files\Development\Allegro61\code\PXML.fasl
  Error: "NET.URI" is not the name of a package.
	[condition type: PACKAGE-ERROR]


Is this familiar to anyone?  Can someone tell me what I'm doing wrong or
point me to the right documentation?

Thank you,
David Christian