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+GNU cflow analyzes a collection of C source files and prints a graph,
+charting control flow within the program.
+
+GNU cflow is able to produce both direct and inverted flowgraphs for
+C sources. Optionally a cross-reference listing can be generated.
+Two output formats are implemented: POSIX and GNU (extended).
+
+Input files can optionally be preprocessed before analyzing.
+
+The package also provides Emacs major mode for examining the produced
+flowcharts in Emacs.