| 1 | <sect1 id="ch06-flex" xreflabel="Flex">
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| 2 | <title>Installing Flex-&flex-version;</title>
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| 3 | <?dbhtml filename="flex.html" dir="chapter06"?>
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| 4 |
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| 5 | <para>The Flex package contains a utility for generating programs that
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| 6 | recognize patterns in text.</para>
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| 7 |
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| 8 | <screen>&buildtime; &flex-time;
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| 9 | &diskspace; &flex-compsize;</screen>
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| 10 |
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| 11 | &aa-flex-down;
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| 12 | &aa-flex-dep;
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| 13 |
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| 14 | <sect2><title> </title><para> </para></sect2>
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| 15 |
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| 16 | <sect2>
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| 17 | <title>Installation of Flex</title>
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| 18 |
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| 19 | <para>Prepare Flex for compilation:</para>
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| 20 |
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| 21 | <screen><userinput>./configure --prefix=/usr</userinput></screen>
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| 22 |
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| 23 | <para>Compile the package:</para>
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| 24 |
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| 25 | <screen><userinput>make</userinput></screen>
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| 26 |
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| 27 | <para>This package has a test suite available which can perform a number of
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| 28 | checks to ensure it built correctly. Should you choose to run it, the
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| 29 | following command will do so:</para>
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| 30 |
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| 31 | <screen><userinput>make bigcheck</userinput></screen>
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| 32 |
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| 33 | <para>And install the package:</para>
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| 34 |
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| 35 | <screen><userinput>make install</userinput></screen>
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| 36 |
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| 37 | <para>There are some packages that expect to find the Lex library in
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| 38 | <filename>/usr/lib</filename>. Create a symlink to account for this:</para>
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| 39 |
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| 40 | <screen><userinput>ln -s libfl.a /usr/lib/libl.a</userinput></screen>
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| 41 |
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| 42 | <para>A few programs don't know about <userinput>flex</userinput> yet and try
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| 43 | to run its predecessor <userinput>lex</userinput>. To support those programs,
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| 44 | create a shell script named <filename>lex</filename> that calls
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| 45 | <userinput>flex</userinput> in Lex emulation mode:</para>
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| 46 |
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| 47 | <screen><userinput>cat > /usr/bin/lex << "EOF"</userinput>
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| 48 | #!/bin/sh
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| 49 | # Begin /usr/bin/lex
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| 50 |
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| 51 | exec /usr/bin/flex -l "$@"
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| 52 |
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| 53 | # End /usr/bin/lex
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| 54 | <userinput>EOF
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| 55 | chmod 755 /usr/bin/lex</userinput></screen>
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| 56 |
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| 57 | </sect2>
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| 58 |
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| 59 | &aa-flex-shortdesc;
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| 60 | &aa-flex-desc;
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| 61 |
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| 62 | </sect1>
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| 63 |
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