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document Build/InstallDev

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@ -342,6 +342,19 @@ directly as the Nth argument to \texttt{BuildPackage}.
Contains all environment variables that are passed to the make command
\end{itemize}
\textbf{\texttt{Build/InstallDev} (optional):} \\
If your package provides a library that needs to be made available to other packages,
you can use the \texttt{Build/InstallDev} template to copy it into the staging directory
which is used to collect all files that other packages might depend on at build time.
When it is called by the build system, two parameters are passed to it. \texttt{\$(1)} points to
the regular staging dir, typically \texttt{staging\_dir/\textit{ARCH}}, while \texttt{\$(2)} points
to \texttt{staging\_dir/host}. The host staging dir is only used for binaries, which are
to be executed or linked against on the host and its \texttt{bin/} subdirectory is included
in the \texttt{PATH} which is passed down to the build system processes.
Please use \texttt{\$(1)} and \texttt{\$(2)} here instead of the build system variables
\texttt{\$(STAGING\_DIR)} and \texttt{\$(STAGING\_DIR\_HOST)}, because the build system behavior
when staging libraries might change in the future to include automatic uninstallation.
\textbf{\texttt{Package/\textit{<name>}/install}:} \\
A set of commands to copy files out of the compiled source and into the ipkg
which is represented by the \texttt{\$(1)} directory. Note that there are currently