BOOK/chapter06/flex-inst.xml

   1 <sect2><title>&nbsp;</title><para>&nbsp;</para></sect2>
   2
   3 <sect2>
   4 <title>Installation of Flex</title>
   5
   6 <para>Prepare Flex to be compiled:</para>
   7
   8 <para><screen><userinput>./configure --prefix=/usr</userinput></screen></para>
   9
  10 <para>Continue with compiling the package:</para>
  11
  12 <para><screen><userinput>make</userinput></screen></para>
  13
  14 <para>Install the package:</para>
  15
  16 <para><screen><userinput>make install</userinput></screen></para>
  17
  18 <para>There are packages which expect to find the lex library
  19 in the <filename>/usr/lib</filename> directory. Create a symlink
  20 to account for this:</para>
  21
  22 <para><screen><userinput>ln -s libfl.a /usr/lib/libl.a</userinput></screen></para>
  23
  24 <para>Some programs don't know about flex and try to find the lex
  25 program (flex is a (better) alternative for lex). To please those
  26 programs, create a shell script named lex which calls flex in
  27 emulation mode:</para>
  28
  29 <para><screen><userinput>cat &gt; /usr/bin/lex &lt;&lt; "EOF"</userinput>
  30 #!/bin/sh
  31 # Begin /usr/bin/lex
  32
  33 exec /usr/bin/flex -l "$@"
  34
  35 # End /usr/bin/lex
  36 <userinput>EOF
  37 chmod 755 /usr/bin/lex</userinput></screen></para>
  38
  39 </sect2>
  40