flex software package provides A fast lexical analyzer generator., you can install in your Ubuntu 12.04 LTS (Precise Pangolin) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install flex
flex is installed in your system.
Make ensure the flex package were installed using the commands given below,
$ sudo dpkg-query -l | grep flex *
You will get with flex package name, version, architecture and description in a table
| Distro | Ubuntu 12 04 lts precise pangolin |
| Section | Development |
| Package | flex |
| Version | 2.5.35-10ubuntu3 |
| Description | A fast lexical analyzer generator. |
| Sub Section | devel |
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