I had a problem which I already fixed, concerning Copyright not being a know keyword. I fixed it by editing ZimbraBuild/Makefile and in each of the spec files (search for spec, you'll find 3 files) I did a sed -e '/Copyright/License/' with all the other sed's in there.

I now have another problem, which I can't seem to fix:
[javac] 1. ERROR in /home/aeldaly/zcs/Ajax/src/com/zimbra/ajax/imagemerge/DecodedFullColorImage.java
    [javac]  (at line 100)
    [javac]     mBufImg = reader.read(0);
    [javac]                      ^^^^
    [javac] The method read(int, ImageReadParam) in the type ImageReader is not applicable for the arguments (int)
    [javac] ----------
    [javac] ----------
    [javac] 2. ERROR in /home/aeldaly/zcs/Ajax/src/com/zimbra/ajax/imagemerge/ImageMerge.java
    [javac]  (at line 440)
    [javac]     writer.write(buffImg);
    [javac]            ^^^^^
    [javac] The method write(IIOMetadata, IIOImage, ImageWriteParam) in the type ImageWriter is not applicable for the arguments (BufferedImage)
    [javac] ----------
    [javac] ----------
    [javac] 3. WARNING in /home/aeldaly/zcs/Ajax/src/com/zimbra/ajax/imagemerge/ImageMergeException.java
    [javac]  (at line 28)
    [javac]     public class ImageMergeException extends Exception {
    [javac]                  ^^^^^^^^^^^^^^^^^^^
    [javac] The serializable class ImageMergeException does not declare a static final serialVersionUID field of type long
    [javac] ----------
    [javac] 3 problems (2 errors, 1 warning)

/home/aeldaly/zcs/ZimbraWebClient/build.xml:108: Compile failed; see the compiler error output for details.

Total time: 41 seconds
make: *** [/home/aeldaly/zcs/ZimbraBuild/../ZimbraWebClient/build/dist/tomcat/webapps/zimbraAdmin.war] Error 1
Does anyone know how to get around this?