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<para>
&SCons; is a software construction tool (build tool, or make tool)
implemented in Python, which uses Python scripts as "configuration
files" for software builds. Based on the design which won the
Software Carpentry build tool competition, &SCons solves a number of
problems associated with other build tools, especially including the
classic and ubiquitous &Make; itself.
</para>
<para>
Distinctive features of &SCons; include: a modular design that
lends itself to being embedded in other applications; a global
view of all dependencies in the source tree; an improved model for
parallel (<option>-j</option>) builds; automatic scanning of files for
dependencies; use of MD5 signatures for deciding whether a file
is up-to-date; use of traditional file timestamps instead of
MD5 signatures available as an option;
use of Python functions or objects to build target files; easy user
extensibility.
</para>
<para>
This paper discusses the goals of the &SCons; project, gives an overview
of the design of &SCons; itself, describes the development process used,
and discusses future plans and directions for the tool.
</para>
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