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\chapter{EAPIs}
\section{Definition}
An EAPI can be thought of as a `version' of this specification to which a package conforms. An EAPI
value is a string as per section~\ref{sec:eapi-names}, and is part of an ebuild's metadata.
If a package manager encounters a package version with an unrecognised EAPI, it must not attempt to
perform any operations upon it. It could, for example, ignore the package version entirely (although
this can lead to user confusion), or it could mark the package version as masked. A package manager
must not use any metadata generated from a package with an unrecognised EAPI.
The package manager must not attempt to perform any kind of comparison test other than equality upon
EAPIs.
EAPIs are also used for profile directories, as described in section~\ref{sec:profile-eapi}.
\section{Defined EAPIs}
The following EAPIs are defined by this specification:
\ChangeWhenAddingAnEAPI{6}
\begin{description}
\item[0] The `original' base EAPI.
\item[1] EAPI `1' contains a number of extensions to EAPI `0'.
\item[2] EAPI `2' contains a number of extensions to EAPI `1'.
\item[3] EAPI `3' contains a number of extensions to EAPI `2'.
\item[4] EAPI `4' contains a number of extensions to EAPI `3'.
\item[5] EAPI `5' contains a number of extensions to EAPI `4'.
\item[6] EAPI `6' contains a number of extensions to EAPI `5'.
\end{description}
Except where explicitly noted, everything in this specification
applies to all of the above EAPIs.%
\footnote{Another unofficial EAPI `kdebuild-1' was a series of
extensions to EAPI `1' formerly used by the Gentoo KDE project.
Some of its features have been included in EAPI `2' or later.}
\section{Reserved EAPIs}
\begin{compactitem}
\item EAPIs whose value consists purely of an integer are reserved for future versions of this
specification.
\item EAPIs whose value starts with the string \t{paludis-} are reserved for experimental
use by the Paludis package manager.
\end{compactitem}
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