Need help in building openjdk 7

[ying lcs]

Hi,

I am trying to build openjdk 7 on ubuntu 8.10.

But when I run this command

 . jdk/make/jdk_generic_profile.sh

I get this warning:

WARNING: Cannot access ALT_BOOTDIR=/opt/java/jdk1.6.0
WARNING: Missing ALT_BINARY_PLUGS_PATH: /opt/java/openjdk-binary-plugs


And then when I run
gmake  sanity
bash: gmake: command not found

Thank you for any help.