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You may encounter lex and yacc when compiling programs that read configuration files or commands.
Lex is a tokenizer that transforms text into numbered tags with labels. The Linux version of lex is named flex. You may need a -ll or -lfl linker flag in conjunction with lex.
Yacc is a parser that attempts to read tokens according to a grammar. The GNU parser is bison; to get yacc compatibility, run bison -y. You may need the -ly linker flag.
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