Error trying to use maven-nar-plugin

I'm trying to build a native "C" project using maven using maven-nar-plugin. I am getting the following errors:

[WARNING] The POM for org.apache.maven.plugins:maven-nar-plugin:jar:2.1-SNAPSHOT is missing, no dependency information available
[ERROR] The build could not read 1 project -> [Help 1]
[ERROR]
[ERROR] The project com.sec.mediascoop:mediascoop:1.0-SNAPSHOT (D:\source\metadata\mediascoop\pom.xml) has 2 errors
[ERROR] Unresolveable build extension: Plugin org.apache.maven.plugins:maven-nar-plugin:2.1-SNAPSHOT or one of its dependencies could not be resolved: Could not find artifact org.apache.maven.plugins:maven-nar-plugin:jar:2.1-SNAPSHOT -> [Help 2]

Following is the relevant section from my pom file:

<project>
...
<packaging>nar</packaging>
...
<build>
    <defaultGoal>install</defaultGoal>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-nar-plugin</artifactId>
            <version>2.1-SNAPSHOT</version>
            <extensions>true</extensions>
            <configuration>
                <layout>NarLayout20</layout>
                <libraries>
                    <library>   
                        <type>shared</type>
                    </library>
                </libraries>
            </configuration>
        </plugin>
    </plugins>
</build>

More info:

1. I'm using Maven version 3.0.5
2. I cannot see the maven-nar-plugin in the Central Repository either
3. I see it is available @ http://duns.github.io/maven-snapshots/. I don't know how to tell maven to look here. It's looking into (2) by default.

The nar plugin developers didn't add it to Maven Central. However, you can use the following module, which is a repackage of the nar plugin:

http://mvnrepository.com/artifact/org.codeswarm/maven-nar-plugin

It has been working fine for me.