Oh I think I see now :) It was internally using a basedir. Switched to using doc:jslFile which has less magic inside it.

git-svn-id: https://svn.apache.org/repos/asf/maven/maven-1/plugins/trunk@113583 13f79535-47bb-0310-9956-ffa450edef68

linkcheck/plugin.jelly

@@ -72,7 +72,7 @@
     outputEncoding="${maven.docs.outputencoding}"
     />
   
-  <doc:jsl
+  <doc:jslFile
     input="${maven.build.dir}/linkcheck/linkcheck-results.xml"
     output="${maven.build.dir}/linkcheck/docs/linkcheck.xml"
     stylesheet="${plugin.resources}/linkcheck.jsl"