xmlbeans-maven-plugin can't find javac

[David Hoffer]

When I use the default configuration for xmlbeans-maven-plugin it fails
because its looking for javac in the current directory (where the pom is).
If I add the configuration below then it works.  How can I make this work in
a portable way?

 <configuration>
    <compiler>C:/Program Files
(x86)/Java/jdk1.6.0_26/bin/javac.exe</compiler>
    ...

-Dave