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\chapter{Auxiliary Programs}
Besides the main {\tt yosys} executable, the Yosys distribution contains a set
of additional helper programs.
\section{yosys-config}
The {\tt yosys-config} tool (an auto-generated shell-script) can be used to
query compiler options and other information needed for building loadable
modules for Yosys. FIXME: See Sec.~\ref{chapter:prog} for details.
\section{yosys-filterlib}
\label{sec:filterlib}
The {\tt yosys-filterlib} tool is a small utility that can be used to strip
or extract information from a Liberty file. See Sec.~\ref{sec:techmap_extern}
for details.
\section{yosys-abc}
This is a fork of ABC \citeweblink{ABC} with a small set of custom modifications
that have not yet been accepted upstream. Not all versions of Yosys work with
all versions of ABC. So Yosys comes with its own yosys-abc to avoid
compatibility issues between the two.
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