chapter06/flex-inst.xml


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42

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

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

<para>Prepare Flex to be compiled:</para>

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

<para>Continue with compiling the package:</para>

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

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

<para>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>