gwt-dnd-3.3.1 source compilation problem

[Oli]

Hi,
I'm trying to compile the sources of gwt-dnd for myself with no modification to the code(Checkout newest version from SVN). But unfortunately get the following cryptic error:

  Attempting to optimize JS
         [ERROR] Unable to parse JavaScript
com.google.gwt.dev.js.JsParserException: StandardLinkerContext.optimizeJavaScript(17): missing ( before function parameters
> function com_allen_sauer_gwt_dnd_gwt-dnd() {
> -------------------------------------^
    at com.google.gwt.dev.js.JsParser$1.error(JsParser.java:110)
    at com.google.gwt.dev.js.rhino.Context.reportError(Context.java:459)
    at com.google.gwt.dev.js.rhino.TokenStream.reportSyntaxError(TokenStream.java:1594)
    at com.google.gwt.dev.js.rhino.Parser.reportError(Parser.java:72)
    at com.google.gwt.dev.js.rhino.Parser.mustMatchToken(Parser.java:64)
    at com.google.gwt.dev.js.rhino.Parser.function(Parser.java:189)
    at com.google.gwt.dev.js.rhino.Parser.parse(Parser.java:116)
    at com.google.gwt.dev.js.JsParser.parseImpl(JsParser.java:131)
    at com.google.gwt.dev.js.JsParser.parse(JsParser.java:89)
    at com.google.gwt.dev.js.JsParser.parseInto(JsParser.java:94)
    at com.google.gwt.core.ext.linker.impl.StandardLinkerContext.optimizeJavaScript(StandardLinkerContext.java:431)
    at com.google.gwt.core.ext.linker.impl.SelectionScriptLinker.generateSelectionScript(SelectionScriptLinker.java:433)
    at com.google.gwt.core.ext.linker.impl.SelectionScriptLinker.generateSelectionScript(SelectionScriptLinker.java:422)
    at com.google.gwt.core.ext.linker.impl.SelectionScriptLinker.emitSelectionScript(SelectionScriptLinker.java:309)
    at com.google.gwt.core.ext.linker.impl.SelectionScriptLinker.link(SelectionScriptLinker.java:210)
    at com.google.gwt.core.ext.linker.impl.StandardLinkerContext.invokeFinalLink(StandardLinkerContext.java:328)
    at com.google.gwt.dev.Link.doSimulatedShardingLink(Link.java:456)
    at com.google.gwt.dev.Link.link(Link.java:175)
    at com.google.gwt.dev.Compiler.run(Compiler.java:200)
    at com.google.gwt.dev.Compiler.run(Compiler.java:132)
    at com.google.gwt.dev.Compiler$1.run(Compiler.java:99)
    at com.google.gwt.dev.CompileTaskRunner.doRun(CompileTaskRunner.java:55)
    at com.google.gwt.dev.CompileTaskRunner.runWithAppropriateLogger(CompileTaskRunner.java:50)
    at com.google.gwt.dev.Compiler.main(Compiler.java:106)
Shutting down PersistentUnitCache thread

The compilation happens via Eclipse->Right-Click on projcet->GWT-Compile with no options.
GWT is 2.6.0, tried it with 2.6.1, same error, jre7
Does anybody have a clue where to search for the problem, the debug isn't very helpful?

Thanks

Additional Linker Information:

Linking into C:\Users\xx\git\gwt-dnd\

DragDrop\war\com.allen_sauer.gwt.dnd.gwt-dnd
   Constructing StandardLinkerContext
      Added selection property ClientBundle.enableInlining : [ false true ]
      Added configuration property com.google.gwt.core.ext.linker.impl.StandardConfigurationProperty@762578
      Added configuration property com.google.gwt.core.ext.linker.impl.StandardConfigurationProperty@96084a
      Added configuration property com.google.gwt.core.ext.linker.impl.StandardConfigurationProperty@1fa6c05
      Added configuration property com.google.gwt.core.ext.linker.impl.StandardConfigurationProperty@1c9c161
      Added configuration property com.google.gwt.core.ext.linker.impl.StandardConfigurationProperty@b6d37a
      Added configuration property com.google.gwt.core.ext.linker.impl.StandardConfigurationProperty@f60ec0
      Added configuration property com.google.gwt.core.ext.linker.impl.StandardConfigurationProperty@428ad3
      Added configuration property com.google.gwt.core.ext.linker.impl.StandardConfigurationProperty@a85718
      Added selection property audioElementSupport : [ maybe no ]
      Added selection property canvasElementSupport : [ maybe no ]
      Added selection property compiler.emulatedStack : [ false true ]
      Added configuration property com.google.gwt.core.ext.linker.impl.StandardConfigurationProperty@1c71633
      Added configuration property com.google.gwt.core.ext.linker.impl.StandardConfigurationProperty@1827556
      Added configuration property com.google.gwt.core.ext.linker.impl.StandardConfigurationProperty@1e565fa
      Added configuration property com.google.gwt.core.ext.linker.impl.StandardConfigurationProperty@18a2b1d
      Added selection property compiler.predeclare.cross.fragment.references : [ false true ]
      Added configuration property com.google.gwt.core.ext.linker.impl.StandardConfigurationProperty@14bb41
      Added configuration property com.google.gwt.core.ext.linker.impl.StandardConfigurationProperty@111d8a8
      Added selection property compiler.stackMode : [ emulated native strip ]
      Added selection property compiler.useSourceMaps : [ false true ]
      Added selection property compiler.useSymbolMaps : [ false true ]
      Added configuration property com.google.gwt.core.ext.linker.impl.StandardConfigurationProperty@a70f94
      Added configuration property com.google.gwt.core.ext.linker.impl.StandardConfigurationProperty@1eff339
      Added configuration property com.google.gwt.core.ext.linker.impl.StandardConfigurationProperty@493bc5
      Added configuration property com.google.gwt.core.ext.linker.impl.StandardConfigurationProperty@1f31c4d
      Added configuration property com.google.gwt.core.ext.linker.impl.StandardConfigurationProperty@1c73785
      Added selection property dragEventSupport : [ maybe no ]
      Added selection property geolocationSupport : [ maybe no ]
      Added configuration property com.google.gwt.core.ext.linker.impl.StandardConfigurationProperty@e1b6c
      Added selection property gwt.enableDebugId : [ false true ]
      Added selection property gwt.forceBidi : [ false true ]
      Added selection property gwt.logging.enabled : [ FALSE SEVERE TRUE WARNING ]
      Added selection property gwt.suppressNonStaticFinalFieldWarnings : [ false true ]
      Added selection property gwt.unloadEnabled : [ false true ]
      Added configuration property com.google.gwt.core.ext.linker.impl.StandardConfigurationProperty@2a59bd
      Added configuration property com.google.gwt.core.ext.linker.impl.StandardConfigurationProperty@699ceb
      Added configuration property com.google.gwt.core.ext.linker.impl.StandardConfigurationProperty@1bd2a5d
      Added configuration property com.google.gwt.core.ext.linker.impl.StandardConfigurationProperty@2851ff
      Added configuration property com.google.gwt.core.ext.linker.impl.StandardConfigurationProperty@11f6990
      Added configuration property com.google.gwt.core.ext.linker.impl.StandardConfigurationProperty@14b8d50
      Added configuration property com.google.gwt.core.ext.linker.impl.StandardConfigurationProperty@12a9357
      Added selection property locale : [ default ]
      Added configuration property com.google.gwt.core.ext.linker.impl.StandardConfigurationProperty@2f5e62
      Added configuration property com.google.gwt.core.ext.linker.impl.StandardConfigurationProperty@1dd95e0
      Added configuration property com.google.gwt.core.ext.linker.impl.StandardConfigurationProperty@9abfba
      Added configuration property com.google.gwt.core.ext.linker.impl.StandardConfigurationProperty@1a158f4
      Added configuration property com.google.gwt.core.ext.linker.impl.StandardConfigurationProperty@1d7281e
      Added configuration property com.google.gwt.core.ext.linker.impl.StandardConfigurationProperty@8adaed
      Added configuration property com.google.gwt.core.ext.linker.impl.StandardConfigurationProperty@2b188e
      Added configuration property com.google.gwt.core.ext.linker.impl.StandardConfigurationProperty@15916d2
      Added selection property storageSupport : [ maybe no ]
      Added selection property superdevmode : [ off on ]
      Added selection property touchEventSupport : [ maybe no ]
      Added selection property user.agent : [ gecko1_8 ie10 ie8 ie9 safari ]
      Added configuration property com.google.gwt.core.ext.linker.impl.StandardConfigurationProperty@1e9588f
      Added selection property videoElementSupport : [ maybe no ]
      Added selection property webApiUsage : [ modern stable ]
      Added configuration property com.google.gwt.core.ext.linker.impl.StandardConfigurationProperty@b5436d
      Added configuration property com.google.gwt.core.ext.linker.impl.StandardConfigurationProperty@5dc423