| 1 | <sect1 id="ch-system-zlib" xreflabel="Zlib">
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| 2 | <title>Installing Zlib-&zlib-version;</title>
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| 3 | <?dbhtml filename="zlib.html" dir="chapter06"?>
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| 4 |
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| 5 | <para>The Zlib package contains compression and uncompression routines used by
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| 6 | some programs.</para>
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| 7 |
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| 8 | <screen>&buildtime; &zlib-time;
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| 9 | &diskspace; &zlib-compsize;</screen>
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| 10 |
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| 11 | &aa-zlib-down;
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| 12 | &aa-zlib-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 Zlib</title>
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| 18 |
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| 19 | <note><para>Zlib is known to build its shared library incorrectly if CFLAGS is
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| 20 | specified in the environment. If you are using your own CFLAGS variable, be
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| 21 | sure to add the <emphasis>-fPIC</emphasis> directive to your CFLAGS for the
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| 22 | duration of the below <command>configure</command> command, then remove it
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| 23 | afterwards.</para></note>
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| 24 |
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| 25 | <para>Prepare Zlib for compilation:</para>
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| 26 |
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| 27 | <screen><userinput>./configure --prefix=/usr --shared</userinput></screen>
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| 28 |
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| 29 | <para>Compile the package:</para>
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| 30 |
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| 31 | <screen><userinput>make</userinput></screen>
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| 32 |
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| 33 | <para>To have the results tested, issue:
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| 34 | <userinput>make check</userinput>.</para>
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| 35 |
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| 36 | <para>Install the shared library:</para>
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| 37 |
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| 38 | <screen><userinput>make install</userinput></screen>
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| 39 |
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| 40 | <para>Now also build the non-shared (static) library:</para>
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| 41 | <screen><userinput>make clean
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| 42 | ./configure --prefix=/usr
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| 43 | make</userinput></screen>
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| 44 |
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| 45 | <para>To have the results tested again, issue:
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| 46 | <userinput>make check</userinput>.</para>
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| 47 |
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| 48 | <para>Install the static library:</para>
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| 49 |
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| 50 | <screen><userinput>make install</userinput></screen>
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| 51 |
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| 52 | <para>And fix the permissions on the static library:</para>
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| 53 |
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| 54 | <screen><userinput>chmod 644 /usr/lib/libz.a</userinput></screen>
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| 55 |
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| 56 | <para>It is good policy and common practice to place important libraries into
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| 57 | the <filename class="directory">/lib</filename> directory. This matters most
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| 58 | in scenarios where <filename class="directory">/usr</filename> is on a
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| 59 | separate partition. Essentially, the run-time components of any libraries that
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| 60 | are used by programs in <filename class="directory">/bin</filename> or
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| 61 | <filename class="directory">/sbin</filename> should reside in
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| 62 | <filename class="directory">/lib</filename> so that they are on the root
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| 63 | partition and available in the event of
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| 64 | <filename class="directory">/usr</filename> being inaccessible.</para>
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| 65 |
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| 66 | <para>For the above reason we move the run-time components of the shared Zlib
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| 67 | into <filename class="directory">/lib</filename>:</para>
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| 68 |
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| 69 | <screen><userinput>mv /usr/lib/libz.so.* /lib</userinput></screen>
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| 70 |
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| 71 | <para>Now we need to fix the <filename>/usr/lib/libz.so</filename> symlink
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| 72 | because we just moved the file it points to:</para>
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| 73 |
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| 74 | <screen><userinput>ln -sf ../../lib/libz.so.1 /usr/lib/libz.so</userinput></screen>
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| 75 |
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| 76 | </sect2>
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| 77 |
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| 78 | &aa-zlib-shortdesc;
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| 79 | &aa-zlib-desc;
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| 80 |
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| 81 | </sect1>
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| 82 |
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