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/usr/share/doc/flex/examples/manual/README is in flex 2.6.4-6.

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This directory contains the example programs from the manual, and a
few other things as well. To make all the programs, simply type "make
-f Makefile.examples", and assuming you have flex and gcc, all will be
well.

To build the programs individually, type

   make -f Makefile.examples program_name

For example:

   make -f Makefile.examples expr