Parece que solo se puede hacer la compilación del JDK 6u1 en ciertas distros y arquitecturas:

[b]Linux System Setup[/b]

[b]i586 only:[/b] [b]The official build platform for the JDK 6u1 is Redhat Enterprise Advanced Server 2.1 update 2[/b]. Formerly known as RedHat Advanced Server 2.1 update 2.

The minimum recommended hardware for building the Linux version is a Pentium class processor or better, at least 256 MB of RAM, and approximately 1.5 GB of free disk space.

[b]amd64 only:[/b] [b]The official build platform for the amd 64-bit version of JDK 6u1 is Suse 8 Enterprise Server - AMD64 Edition[/b]. The minimum recommended hardware for building the Linux-amd64 version is a AMD opteron class processor, at least 512 MB of RAM, and approximately 4 GB of free disk space.

The build uses the tools contained in /bin and /usr/bin of a standard installation of the Linux operating environment. You should ensure that these directories are on your PATH.

Note that some Linux systems have a habit of pre-populating your environment variables for you, for example JAVA_HOME might get pre-defined for you to refer to the JDK installed on your Linux system. You need to unset JAVA_HOME. It's a good idea to run env and verify the environment variables you are getting from the default system settings.