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<project ...>
    <!-- stuff -->
        <build>
            <plugins>
                <plugin>
                    <groupId>org.codehaus.mojo</groupId>
                    <artifactId>build-helper-maven-plugin</artifactId>
                    <version>1.5</version>
                    <executions>
                        <execution>
                            <id>add-source</id>
                            <phase>generate-sources</phase>
                            <goals>
                                <goal>add-source</goal>
                            </goals>
                            <configuration>
                                <sources>
                                    <source>target/generated-sources</source>
                                </sources>
                            </configuration>
                        </execution>
                    </executions>
                </plugin>
            <!-- other plugins -->
            </plugins>
        </build>
    <!-- more stuff -->
</project>