Opps, forgot need this too to build the plugin

features/org.eclipse.jem-feature/org.eclipse.wtp.common/build.properties

diff --git a/features/org.eclipse.jem-feature/org.eclipse.wtp.common/build.properties b/features/org.eclipse.jem-feature/org.eclipse.wtp.common/build.properties
new file mode 100644
index 0000000..1900d4c
--- /dev/null
+++ b/features/org.eclipse.jem-feature/org.eclipse.wtp.common/build.properties
@@ -0,0 +1,3 @@
+bin.includes = common.jar,\
+               common_core.jar,\
+               plugin.xml