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>The building blocks of an <SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
> configuration are called
	  <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>packages</I
></SPAN
>. Packages are the units of
	  software distribution.  A set of core packages (such as
	  kernel, C library and math library) is provided by Red Hat:
	  additional third-party packages will be available in
	  future.</P
><P
>A package may exist in one of a number of <SPAN
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 The default version is the <SPAN
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> version.
 Only one version of a given package may be present in the component
repository at any given time.</P
><P
>Packages are organized in a tree hierarchy.  Each package
is either at the top-level or is the child of another package.</P
><P
>The <SPAN
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> <SPAN
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> Package Administration Tool</SPAN
> can be used to add or remove
packages from the component repository.  The <SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
> <SPAN
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>Configuration Tool</SPAN
> can be used to include or exclude packages from the configuration
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