Initial import of re2c-0.9.1 into the NetBSD Packages Collection.

re2c is a preprocessor that generates C-based recognizers from regular
expressions.  The input to re2c consists of C/C++ source interleaved
with comments of the form /*!re2c ...  */ which contain scanner
specifications.  In the output these comments are replaced with code
that, when executed, will find the next input token and then execute
some user-supplied token-specific code.

re2c generates parsers which are not table-based, and can be twice as
fast as flex.

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