To build vfs-maven-plugin following repository has to be defined in your Maven settings.xml

<repository>
	<id>maven-vfs-plugin-github</id>
	<url>https://comundus.github.io/maven2-repository</url>
</repository>

This other one is possibly not needed anymore

<repository>
    <id>maven2-repository.dev.java.net</id>
    <name>Java.net Repository for Maven</name>
    <url>http://download.java.net/maven/2/</url>
    <layout>default</layout>
</repository>