Description of problem:
When I build a Eclipse plugin for 3.3 with the Sun JVM there isn't any problem
but when I try it with GCJ the Eclipse builder don't find
org.eclipse.pde.internal.build.BuildScriptGenerator class and fail with this
message:

BUILD FAILED
/usr/share/eclipse/plugins/org.eclipse.pde.build/scripts/build.xml:24:
The following error occurred while executing this line:
/usr/share/eclipse/plugins/org.eclipse.pde.build/scripts/build.xml:64:
The following error occurred while executing this line:
/usr/share/eclipse/plugins/org.eclipse.pde.build/templates/package-build/customTargets.xml:17:
The following error occurred while executing this line:
/usr/share/eclipse/plugins/org.eclipse.pde.build_3.3.0.v20070612/scripts/genericTargets.xml:85:
Could not create type eclipse.buildScript due to
java.lang.NoClassDefFoundError:
org.eclipse.pde.internal.build.BuildScriptGenerator

Version-Release number of selected component (if applicable):
java-1.5.0-gcj-1.5.0.0-14.fc7
libgcj-4.1.2-12
eclipse-pde-3.3.0-1.fc8 (build here form the source repo)

How reproducible:
building any Eclipse package that use the Eclipse builder like eclipse-mylar and
 eclipse-changelog packages.

Additional info:
$ locate org.eclipse.pde | grep jar.db
/usr/lib/gcj/eclipse/org.eclipse.pde.core_3.3.0.v20070608-1300.jar.db
/usr/lib/gcj/eclipse/org.eclipse.pde.junit.runtime_3.3.0.v20070608-1300.jar.db
/usr/lib/gcj/eclipse/org.eclipse.pde.runtime_3.3.0.v20070608-1300.jar.db
/usr/lib/gcj/eclipse/org.eclipse.pde.ui.templates_3.3.0.v20070608-1300.jar.db
/usr/lib/gcj/eclipse/org.eclipse.pde.ui_3.3.0.v20070608-1300.jar.db
/usr/lib/gcj/eclipse/org.eclipse.pde_3.3.0.v20070608-1300.jar.db

$ locate org.eclipse.pde | grep .jar | grep /usr/share
/usr/share/eclipse/plugins/org.eclipse.pde.build.nls.fr_3.2.1.v200609270227.jar
/usr/share/eclipse/plugins/org.eclipse.pde.core.nls.fr_3.2.1.v200609270227.jar
/usr/share/eclipse/plugins/org.eclipse.pde.core_3.3.0.v20070608-1300.jar
/usr/share/eclipse/plugins/org.eclipse.pde.doc.user.nls.fr_3.2.1.v200609270227.jar
/usr/share/eclipse/plugins/org.eclipse.pde.junit.runtime.nls.fr_3.2.0.v200609270227.jar
/usr/share/eclipse/plugins/org.eclipse.pde.junit.runtime_3.3.0.v20070608-1300.jar
/usr/share/eclipse/plugins/org.eclipse.pde.nls.fr_3.2.1.v200609270227.jar
/usr/share/eclipse/plugins/org.eclipse.pde.runtime.nls.fr_3.2.0.v200609270227.jar
/usr/share/eclipse/plugins/org.eclipse.pde.runtime_3.3.0.v20070608-1300.jar
/usr/share/eclipse/plugins/org.eclipse.pde.source.nls.fr_3.2.1.v200609270227.jar
/usr/share/eclipse/plugins/org.eclipse.pde.ui.nls.fr_3.2.1.v200609270227.jar
/usr/share/eclipse/plugins/org.eclipse.pde.ui.templates_3.3.0.v20070608-1300.jar
/usr/share/eclipse/plugins/org.eclipse.pde.ui_3.3.0.v20070608-1300.jar
/usr/share/eclipse/plugins/org.eclipse.pde_3.3.0.v20070608-1300.jar
/usr/share/eclipse/plugins/org.eclipse.pde.build_3.3.0.v20070612/pdebuild.jar
/usr/share/eclipse/plugins/org.eclipse.pde.build_3.3.0.v20070612/lib/pdebuild-an