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+This is flex, the fast lexical analyzer generator.
+flex is a tool for generating scanners: programs which recognize
+lexical patterns in text.
+The flex codebase is kept in
+[Git on GitHub.](
+Use GitHub's [issues]( and
+[pull request]( features to file bugs
+and submit patches.
+There are several mailing lists available as well:
+* - where posts will be made
+ announcing new releases of flex.
+* - where you can post questions about
+ using flex
+* - where you can discuss development
+ of flex itself
+Find information on subscribing to the mailing lists at:
+The flex distribution contains the following files which may be of
+* README - This file.
+* NEWS - current version number and list of user-visible changes.
+* INSTALL - basic installation information.
+* ABOUT-NLS - description of internationalization support in flex.
+* COPYING - flex's copyright and license.
+* doc/ - user documentation.
+* examples/ - containing examples of some possible flex scanners and a
+ few other things. See the file examples/README for more
+ details.
+* tests/ - regression tests. See TESTS/README for details.
+* po/ - internationalization support files.
+You need the following tools to build flex from the maintainer's
+* compiler suite - flex is built with gcc
+* bash, or a good Bourne-style shell
+* m4 - m4 -p needs to work; GNU m4 and a few others are suitable
+* GNU bison; to generate parse.c from parse.y
+* autoconf; for handling the build system
+* automake; for Makefile generation
+* gettext; for i18n support
+* help2man; to generate the flex man page
+* tar, gzip, lzip, etc.; for packaging of the source distribution
+* GNU texinfo; to build and test the flex manual. Note that if you want
+ to build the dvi/ps/pdf versions of the documentation you will need
+ texi2dvi and related programs, along with a sufficiently powerful
+ implementation of TeX to process them. See your operating system
+ documentation for how to achieve this. The printable versions of the
+ manual are not built unless specifically requested, but the targets
+ are included by automake.
+* GNU indent; for indenting the flex source the way we want it done
+In cases where the versions of the above tools matter, the file will specify the minimum required versions.
+Once you have all the necessary tools installed, life becomes
+simple. To prepare the flex tree for building, run the script:
+in the top level of the flex source tree.
+This script calls the various tools needed to get flex ready for the
+GNU-style configure script to be able to work.
+From this point on, building flex follows the usual routine:
+configure && make && make install
+This file is part of flex.
+This code is derived from software contributed to Berkeley by
+Vern Paxson.
+The United States Government has rights in this work pursuant
+to contract no. DE-AC03-76SF00098 between the United States
+Department of Energy and the University of California.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+1. Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in the
+ documentation and/or other materials provided with the distribution.
+Neither the name of the University nor the names of its contributors
+may be used to endorse or promote products derived from this software
+without specific prior written permission.