In section 3.2.1 Link files (page 111) the text recommends changes to a previously defined Ant file (see page 90) to support Link files, I believe the references to ${plugin.dir} (see below) should be replaced by ${plugin.jarname} to be consistent with the Ant file.
<property name="plugin.jar" location=
"${build.temp}/jars/plugins/${plugin.dir}.jar" />
with this (location must be on a single line):
<property name="plugin.jar" location=
"${build.temp}/jars/QualityEclipse/Favorites/
eclipse/plugins/${plugin.dir}.jar" />
I apologize if this was captured on a previous post.