BOOK/chapter06/flex.xml

   1 <sect1 id="ch-system-flex" xreflabel="Flex">
   2 <title>Installing Flex-&flex-version;</title>
   3 <?dbhtml filename="flex.html" dir="chapter06"?>
   4
   5 <para>The Flex package contains a utility for generating programs that
   6 recognize patterns in text.</para>
   7
   8 <screen>&buildtime; &flex-time;
   9 &diskspace; &flex-compsize;</screen>
  10
  11 &aa-flex-down;
  12 &aa-flex-dep;
  13
  14 <sect2><title>&nbsp;</title><para>&nbsp;</para></sect2>
  15
  16 <sect2>
  17 <title>Installation of Flex</title>
  18
  19 <para>Prepare Flex for compilation:</para>
  20
  21 <screen><userinput>./configure --prefix=/usr</userinput></screen>
  22
  23 <para>Compile the package:</para>
  24
  25 <screen><userinput>make</userinput></screen>
  26
  27 <para>This package has a test suite available which can perform a number of
  28 checks to ensure it built correctly.  Should you choose to run it, the
  29 following command will do so:</para>
  30
  31 <screen><userinput>make bigcheck</userinput></screen>
  32
  33 <para>And install the package:</para>
  34
  35 <screen><userinput>make install</userinput></screen>
  36
  37 <para>There are some packages that expect to find the <emphasis>lex</emphasis>
  38 library in <filename>/usr/lib</filename>. Create a symlink to account for
  39 this:</para>
  40
  41 <screen><userinput>ln -s libfl.a /usr/lib/libl.a</userinput></screen>
  42
  43 <para>A few programs don't know about <command>flex</command> yet and try
  44 to run its predecessor <command>lex</command>. To support those programs,
  45 create a wrapper script named <filename>lex</filename> that calls
  46 <command>flex</command> in <emphasis>lex</emphasis> emulation mode:</para>
  47
  48 <screen><userinput>cat &gt; /usr/bin/lex &lt;&lt; "EOF"</userinput>
  49 #!/bin/sh
  50 # Begin /usr/bin/lex
  51
  52 exec /usr/bin/flex -l "$@"
  53
  54 # End /usr/bin/lex
  55 <userinput>EOF
  56 chmod 755 /usr/bin/lex</userinput></screen>
  57
  58 </sect2>
  59
  60 &aa-flex-shortdesc;
  61 &aa-flex-desc;
  62
  63 </sect1>
  64