To build HelenOS, the following build tools must be installed:
\begin{itemize}
\item GCC 4.1.1 + binutils 2.16.1 cross compiler environment for target platform \item python 2.3 or higher \end{itemize}
The GNU build environment is best downloaded, compiled and installed
automatically using the shell scripts located in the
{\em kernel/contrib/toolchain} directory.
HelenOS features a user friendly configuration system. Once
a {\em make} command is run from the {\em boot/} directory, a
{\em dialog} driven application is started and the developer is asked several
questions regarding build configuration parameters. The answers are saved
in the file {\em Makefile.config} in the boot/, kernel/ and uspace/
directories and are automatically used for each subsequent build.
In order to modify the parameters, the user should change to the particular subsystem
directory and type {\em make config}. When the build configuration parameters
are changed, the whole subsystem should be completely rebuilt. The
configuration system offers to do this automatically for the user.