lfs-book/chapter06/flex-inst.xml

<sect2><title>&nbsp;</title><para>&nbsp;</para></sect2>

<sect2>
<title>Installation of Flex</title>

<para>Prepare Flex for compilation:</para>

<para><screen><userinput>./configure --prefix=/usr</userinput></screen></para>

<para>Compile the package:</para>

<para><screen><userinput>make</userinput></screen></para>

<para>Test the results:</para>

<para><screen><userinput>make bigcheck</userinput></screen></para>

<para>And install the package:</para>

<para><screen><userinput>make install</userinput></screen></para>

<para>There are packages which expect to find the lex library
in the <filename>/usr/lib</filename> directory. Create a symlink
to account for this:</para>

<para><screen><userinput>ln -s libfl.a /usr/lib/libl.a</userinput></screen></para>

<para>Some programs don't know about flex and try to find the lex
program (flex is a (better) alternative for lex). To please those
programs, create a shell script named lex which calls flex in
emulation mode:</para>

<para><screen><userinput>cat &gt; /usr/bin/lex &lt;&lt; "EOF"</userinput>
#!/bin/sh
# Begin /usr/bin/lex

exec /usr/bin/flex -l "$@"

# End /usr/bin/lex
<userinput>EOF
chmod 755 /usr/bin/lex</userinput></screen></para>

</sect2>