| 1 | <sect1 id="ch06-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 | <screen>Estimated build time: &zlib-time;
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| 6 | Estimated required disk space: &zlib-compsize;</screen>
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| 7 |
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| 8 | &aa-zlib-shortdesc;
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| 9 | &aa-zlib-dep;
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| 10 |
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| 11 | <sect2><title> </title><para> </para></sect2>
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| 12 |
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| 13 | <sect2>
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| 14 | <title>Installation of Zlib</title>
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| 15 |
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| 16 | <para>Zlib has a potential buffer overflow in its
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| 17 | <emphasis>gzprintf()</emphasis> function, that, though difficult to take
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| 18 | advantage of, should be taken care of by applying this patch:</para>
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| 19 |
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| 20 | <screen><userinput>patch -Np1 -i ../&zlib-patch;</userinput></screen>
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| 21 |
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| 22 | <para>Now prepare Zlib for compilation:</para>
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| 23 |
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| 24 | <screen><userinput>./configure --prefix=/usr --shared</userinput></screen>
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| 25 |
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| 26 | <para>Note: Zlib is known to build its shared library incorrectly if a CFLAGS
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| 27 | is specified in the environment. If you are using your own CFLAGS variables,
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| 28 | ensure you add the <emphasis role="strong">-fPIC</emphasis> directive during
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| 29 | this stage, and remove it afterwards.</para>
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| 30 |
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| 31 | <para>Compile the package:</para>
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| 32 |
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| 33 | <screen><userinput>make</userinput></screen>
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| 34 |
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| 35 | <para>Install the shared libraries:</para>
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| 36 |
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| 37 | <screen><userinput>make install</userinput></screen>
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| 38 |
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| 39 | <para>Now also build the non-shared libraries:</para>
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| 40 | <screen><userinput>make clean
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| 41 | ./configure --prefix=/usr
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| 42 | make</userinput></screen>
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| 43 |
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| 44 | <para>This package has a test suite available which can perform a number of
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| 45 | checks to ensure it built correctly. Should you choose to run it, the
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| 46 | following command will do so:</para>
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| 47 |
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| 48 | <screen><userinput>make test</userinput></screen>
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| 49 |
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| 50 | <para>And install the package:</para>
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| 51 |
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| 52 | <screen><userinput>make install</userinput></screen>
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| 53 |
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| 54 | <para>The shared Zlib library should be installed in the
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| 55 | <filename>/lib</filename> directory. That way, in the event
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| 56 | that you must boot without the <filename>/usr</filename>
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| 57 | directory, vital system programs will still have access to
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| 58 | the library:</para>
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| 59 |
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| 60 | <screen><userinput>mv /usr/lib/libz.so.* /lib</userinput></screen>
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| 61 |
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| 62 | <para>The <filename>/usr/lib/libz.so</filename> symlink is
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| 63 | linked to a file which no longer exists, because we moved
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| 64 | it. Create a symbolic link to the new location of the
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| 65 | library:</para>
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| 66 |
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| 67 | <screen><userinput>ln -sf ../../lib/libz.so.1 /usr/lib/libz.so</userinput></screen>
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| 68 |
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| 69 | <para>Zlib does not install its manual page. Issue the
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| 70 | following command to install this documentation:</para>
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| 71 |
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| 72 | <screen><userinput>cp zlib.3 /usr/share/man/man3</userinput></screen>
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| 73 |
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| 74 | </sect2>
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| 75 |
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| 76 | </sect1>
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| 77 |
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