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re2c allows one to include other files using directive ``/*!include:re2c FILE */`` or ``!include FILE ;``, where ``FILE`` is a path to the file to be included. The first form should be used outside of re2c blocks, and the second form allows one to include a file in the middle of a re2c block. re2c looks for included files in the directory of the including file and in include locations, which can be specified with ``-I`` option. Include directives in re2c work in the same way as C/C++ ``#include``: the contents of ``FILE`` are copy-pasted verbatim in place of the directive. Include files may have further includes of their own. Use ``--depfile`` option to track build dependencies of the output file on include files. re2c provides some predefined include files that can be found in the ``include/`` subdirectory of the project. These files contain definitions that can be useful to other projects (such as Unicode categories) and form something like a standard library for re2c. Below is an example of using include directive.