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