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>Estimated build time: &flex-time;
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9 | Estimated required disk space: &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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