skip gem installation just before packaging

pom.xml

@@ -26,29 +26,20 @@
   <packaging>gem</packaging>
   <name>ruby wrapper around maven and more</name>
 
+  <pluginRepositories>
+    <pluginRepository>
+      <id>rubygems-releases</id>
+      <url>http://rubygems-proxy.torquebox.org/releases</url>
+    </pluginRepository>
+  </pluginRepositories>
+
   <repositories>
     <repository>
       <id>rubygems-releases</id>
       <url>http://rubygems-proxy.torquebox.org/releases</url>
     </repository>
   </repositories>
 
-  <dependencies>
-    <!-- get the gems so `gem build` works -->
-    <dependency>
-       <groupId>rubygems</groupId>
-       <artifactId>thor</artifactId>
-       <version>0.14.6</version>
-       <type>gem</type>
-    </dependency>
-    <dependency>
-       <groupId>rubygems</groupId>
-       <artifactId>maven-tools</artifactId>
-       <version>0.29.3</version>
-       <type>gem</type>
-    </dependency>
-  </dependencies>
-
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <maven.version>3.0.4</maven.version>
@@ -91,10 +82,34 @@
 	<artifactId>gem-maven-plugin</artifactId>
 	<version>0.29.0</version>
 	<extensions>true</extensions>
+	<executions>
+	  <execution>
+	    <id>default-initialize</id>
+	    <phase>prepare-package</phase>
+	    <goals>
+	      <goal>initialize</goal>
+	    </goals>
+	  </execution>
+	</executions>
 	<configuration>
 	  <gemspec>${project.basedir}/ruby-maven.gemspec</gemspec>
 	  <includeOpenSSL>true</includeOpenSSL>
 	</configuration>
+	<dependencies>
+	  <!-- get the gems so `gem build` works -->
+	  <dependency>
+	    <groupId>rubygems</groupId>
+	    <artifactId>thor</artifactId>
+	    <version>0.14.6</version>
+	    <type>gem</type>
+	  </dependency>
+	  <dependency>
+	    <groupId>rubygems</groupId>
+	    <artifactId>maven-tools</artifactId>
+	    <version>0.29.3</version>
+	    <type>gem</type>
+	  </dependency>
+	</dependencies>
       </plugin>
       <plugin>
 	<artifactId>maven-clean-plugin</artifactId>