JDK 8 Build Failure

[dalibor.topic at oracle.com]

I checked out jdk8/jdk8 and gave it a go using  the new build system. It 
failed eventually with

Generating exceptions classes
Generating icon classes
/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.9.x86_64/jre/lib/rt.jar: invalid 
LOC header (bad signature)
Exception in thread "main" java.lang.NoClassDefFoundError: 
sun/awt/image/SunWritableRaster$DataStealer
         at java.awt.image.DataBuffer.<clinit>(DataBuffer.java:517)
         at 
javax.imageio.ImageTypeSpecifier.createComponentCM(ImageTypeSpecifier.java:249)
         at 
javax.imageio.ImageTypeSpecifier$Interleaved.<init>(ImageTypeSpecifier.java:304)
         at 
javax.imageio.ImageTypeSpecifier.createInterleaved(ImageTypeSpecifier.java:399)
         at 
javax.imageio.ImageTypeSpecifier.createSpecifier(ImageTypeSpecifier.java:1169)
         at 
javax.imageio.ImageTypeSpecifier.getSpecifier(ImageTypeSpecifier.java:1118)
         at 
javax.imageio.ImageTypeSpecifier.createFromBufferedImageType(ImageTypeSpecifier.java:901)
         at 
com.sun.imageio.plugins.png.PNGImageReader.getImageTypes(PNGImageReader.java:1494)
         at 
com.sun.imageio.plugins.png.PNGImageReader.readImage(PNGImageReader.java:1280)
         at 
com.sun.imageio.plugins.png.PNGImageReader.read(PNGImageReader.java:1577)
         at javax.imageio.ImageIO.read(ImageIO.java:1448)
         at javax.imageio.ImageIO.read(ImageIO.java:1352)
         at sun.awt.X11.ToBin.main(ToBin.java:35)
gmake[2]: *** 
[/media/OpenJDK/nashorn/jdk8/build/linux-x86_64-normal-server-release/jdk/gensrc/sun/awt/X11/XAWTIcon32_java_icon16_png.java] 
Error 1
gmake[1]: *** [gensrc-only] Error 2

cheers,
dalibor topic