try to fix source build

Signed-off-by: Florian Thienel <florian@thienel.org>
diff --git a/org.eclipse.vex.sdk.feature/pom.xml b/org.eclipse.vex.sdk.feature/pom.xml
index a7d5bbd..5aa0684 100644
--- a/org.eclipse.vex.sdk.feature/pom.xml
+++ b/org.eclipse.vex.sdk.feature/pom.xml
@@ -13,4 +13,37 @@
 		<relativePath>../org.eclipse.vex.releng/pom.xml</relativePath>
 	</parent>
 
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.eclipse.tycho.extras</groupId>
+				<artifactId>tycho-source-feature-plugin</artifactId>
+				<version>${tycho-version}</version>
+				<executions>
+					<execution>
+						<id>source-feature</id>
+						<phase>package</phase>
+						<goals>
+							<goal>source-feature</goal>
+						</goals>
+					</execution>
+				</executions>
+			</plugin>
+			<plugin>
+				<groupId>org.eclipse.tycho</groupId>
+				<artifactId>tycho-p2-plugin</artifactId>
+				<version>${tycho-version}</version>
+				<executions>
+					<execution>
+						<id>attached-p2-metadata</id>
+						<phase>package</phase>
+						<goals>
+							<goal>p2-metadata</goal>
+						</goals>
+					</execution>
+				</executions>
+			</plugin>
+		</plugins>
+	</build>
+
 </project>