4.3.2 PATH Management
rscons provides methods for management of the PATH environment variable.
The path_append and path_prepend methods can be used to append or prepend
a path to the PATH environment variable.
path_prepend "i686-elf-gcc/bin"
The path_set method sets the PATH environment variable to the given
Array or String.
The path_components method returns an Array of the components in the PATH
environment variable.
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