Ahhhh! got wrong versions on an emf pre-req. PDE didn't tell me, but build said only something wrong.
diff --git a/plugins/org.eclipse.jem.util/META-INF/MANIFEST.MF b/plugins/org.eclipse.jem.util/META-INF/MANIFEST.MF
index ad0084c..69586e5 100644
--- a/plugins/org.eclipse.jem.util/META-INF/MANIFEST.MF
+++ b/plugins/org.eclipse.jem.util/META-INF/MANIFEST.MF
@@ -19,7 +19,7 @@
Require-Bundle: org.eclipse.core.runtime;bundle-version="[3.2.0,4.0.0)",
org.eclipse.core.resources;bundle-version="[3.2.0,4.0.0)",
org.eclipse.emf.ecore;bundle-version="[2.2.0,3.0.0)",
- org.eclipse.emf.ecore.xmi;bundle-version="[3.2.0,4.0.0)",
+ org.eclipse.emf.ecore.xmi;bundle-version="[2.2.0,3.0.0)",
org.eclipse.perfmsr.core;resolution:=optional,
com.ibm.icu;bundle-version="[3.4.4.1,4.0.0)"
Eclipse-LazyStart: true
