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For the moment we still require that contributed changes build with Sun Studio as the compiler. We understand that the required version of Sun Studio is no longer publicly available and will accept contributions that were tested only with GCC. 

If you are trying to build with GCC 4.4.4 and your build fails because of some invalid GCC warning options, try setting the variables GCC_ROOT and CW_GCC_DIR described here.

Preparing build tools

A few tools have to be prepared before we can build the rest of illumos. To build them, you should run commands in a new shell which sets some environment variables: