Hi Paul, looks like an old assembly-plugin version is used.
This one is for the stacktrace https://github.com/apache/maven-assembly-plugin/blob/maven-assembly-plugin-2.2.1/src/main/java/org/apache/maven/plugin/assembly/mojos/AbstractAssemblyMojo.java and doesn't allow posix while master https://github.com/apache/maven-assembly-plugin/blob/master/src/main/java/org/apache/maven/plugins/assembly/mojos/AbstractAssemblyMojo.java allows it. Regards Dennis
