Cygwin gcj 4.9.3 で NoClassDefFoundError GCCMain エラー

gcj エラー出力

/usr/bin/gcj -O2 --encoding=UTF-8 --classpath="/usr/share/java/libgcj-4.9.3.jar:/home/ku_000/pdftk-2.02-dist/java:." -C pdftk/com/lowagie/text/ElementTags.java
Exception in thread "main" java.lang.NoClassDefFoundError: org.eclipse.jdt.internal.compiler.batch.GCCMain
   at gnu.java.lang.MainThread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: org.eclipse.jdt.internal.compiler.batch.GCCMain not found in gnu.gcj.runtime.SystemClassLoader{urls=[], parent=gnu.gcj.runtime.ExtensionClassLoader{urls=[], parent=null}}
   at java.net.URLClassLoader.findClass(Unknown Source)
   at java.lang.ClassLoader.loadClass(Unknown Source)
   at java.lang.ClassLoader.loadClass(Unknown Source)
   at gnu.java.lang.MainThread.run(Unknown Source)
Makefile:44: recipe for target 'pdftk/com/lowagie/text/ElementTags.class' failed
make[1]: [pdftk/com/lowagie/text/ElementTags.class] Error 1 (ignored)

こういう事らしいです…

Specifically, it says to download

  ftp://sourceware.org/pub/java/ecj-latest.jar

and rename the file to

  /usr/share/java/ecj.jar.

https://cygwin.com/ml/cygwin/2012-04/msg00103.html