compile gwt module of gelc error

Hi, I download the latest gelc application from repository and build with ant,get following error(JDK1.5,ANT 1.6.5 on Windows XP sp2): gelc.gwt: [gwtcompile] Compiling org.curriki.gwt.Main [gwtcompile] Output will be written into H:\SoftDeveloping\wiki\xwiki\EclipseSpa ce\gelc\build\org.curriki.gwt.Main [gwtcompile] Analyzing permutation #1 [gwtcompile] [ERROR] Unexpected internal compiler error [gwtcompile] java.lang.OutOfMemoryError: Java heap space BUILD FAILED H:\SoftDeveloping\wiki\xwiki\EclipseSpace\gelc\build.xml:76: Unable to compile G WT I can't found documents on build gelc,please help! Jackson