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About the lexical scanner
=========================
Bisonc++ uses a lexical scanner generated by flex.
The file bisonc++/scanner/yylex.cc depends on a file FlexLexer.h having
different contents over different `flex' versions.
Bisonc++ therefore also depends on flex being installed, callable as the
program `flex'.
Starting with Bisonc++ version 2.4.2 the build process will create
scanner/yylex.cc from the file scanner/lexer and scanner/yylex.cc is no longer
included in Bisonc++'s distribution.
Frank.
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