%%% src_config
Variable \Envar{target} is given to configure to ensure correct detection of platform.

We check automatically for 32 or 64 capacity by string:

\begin{verbatim}
$(ause_enable 'cap32' 'ABI=32' ) \
\end{verbatim}

\Prog{ause\_enable} is method of \Prog{any} build system.
It checks, whether condition \Arg{cap32} is present in current build configuration.
If it is, then method prints the second argument, \texttt{ABI=32}.
If no, it prints nothing and parameter is not added.
In this way we may dynamically detect some conditions and add options, depending on them.

\Arg{cap32} is an element of configuration, when build goes in 32-bit mode.
