Configuring gcj and ecj.jar to build icedtea6

[Robin Cook]

Hello,

I use a sourced base distribution and I am trying to figure out what all
needs to be done to build icedtea6 1.10.4 using gcj and ejc.jar.

I have gcc 4.6.1 with c++ and gcj compiled and installed and as part of
gcj it installs ecj.jar.

I can't seem to find any instructions anywhere on what to do next to get
it setup so icedtea6 will build.  

If someone can point me to information on getting gcj and ecj.jar setup
would be a big help.  Thanks.

This is what I get when I try to build icedtea6,  I have the complete
build log if that is needed.

WARNING: Your build environment has the variable NO_DOCS
         defined. This will result in a development-only
         build of the JDK, lacking the documentation
         build.
 
WARNING: The version of make being used is older than 
       the required version of '3.78'. 
       The version of make found was ''. 
 
WARNING: The version of unzip being used is older than 
       the required version of '5.12'. 
       The version of unzip found was ''. 
 
WARNING: The version of zip being used is older than 
       the required version of '2.2'. 
       The version of zip found was ''. 
 
ERROR: Your BOOTDIR environment variable does not point 
       to a valid JDK for bootstrapping this build. 
       A JDK 6  Update 22 build must be bootstrapped using  
       JDK 1.6.0 fcs (or later). 
       Apparently, your bootstrap JDK is version  
       Please update your ALT_BOOTDIR setting and start your build
again. 

The missing programs are installed:
make   3.82
zip    3.0 
unzip  6.0

Also is there a way to build icedtea6 without libxp since is has been
deprecated for quite a while is not normally on the system?
Is there a way to have configure look in /usr/bin for some of the
progams it looks in /bin for (exp egrep)?

Thanks 

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