| 1 | <sect2><title> </title><para> </para></sect2>
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| 2 |
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| 3 | <sect2>
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| 4 | <title>Installation of Zlib</title>
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| 5 |
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| 6 | <para>Zlib has a potential buffer overflow in its gzprintf() function,
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| 7 | that, though difficult to take advantage of, should be taken care of. Do
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| 8 | so by applying this patch:</para>
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| 9 |
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| 10 | <para><screen><userinput>patch -Np1 -i ../zlib-&zlib-patch-version;.patch</userinput></screen></para>
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| 11 |
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| 12 | <para>Now prepare Zlib for compilation:</para>
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| 13 |
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| 14 | <para><screen><userinput>./configure --prefix=/usr --shared</userinput></screen></para>
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| 15 |
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| 16 | <para>Note: Zlib is known to build it's shared library incorrectly
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| 17 | if a CFLAGS is specified in the environment. If you are using your
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| 18 | own CFLAGS variables, ensure you add the <emphasis role="strong">-fPIC</emphasis>
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| 19 | directive during this stage, and remove it after.</para>
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| 20 |
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| 21 | <para>Compile the package:</para>
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| 22 |
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| 23 | <para><screen><userinput>make</userinput></screen></para>
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| 24 |
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| 25 | <para>Install the shared libraries:</para>
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| 26 |
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| 27 | <para><screen><userinput>make install</userinput></screen></para>
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| 28 |
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| 29 | <para>Now also build the non-shared libraries:</para>
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| 30 | <para><screen><userinput>make clean
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| 31 | ./configure --prefix=/usr
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| 32 | make</userinput></screen></para>
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| 33 |
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| 34 | <para>This package has a testsuite available which can perform a number of
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| 35 | checks to ensure it built correctly. Should you choose to run it, the
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| 36 | following command will do so:</para>
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| 37 |
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| 38 | <para><screen><userinput>make test</userinput></screen></para>
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| 39 |
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| 40 | <para>And install the package:</para>
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| 41 |
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| 42 | <para><screen><userinput>make install</userinput></screen></para>
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| 43 |
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| 44 | <para>The shared Zlib library should be installed in the
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| 45 | <filename>/lib</filename> directory. That way, in the event
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| 46 | that you must boot without the <filename>/usr</filename>
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| 47 | directory, vital system programs will still have access to
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| 48 | the library:</para>
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| 49 |
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| 50 | <para><screen><userinput>mv /usr/lib/libz.so.* /lib</userinput></screen></para>
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| 51 |
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| 52 | <para>The <filename>/usr/lib/libz.so</filename> symlink is
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| 53 | linked to a file which no longer exists, because we moved
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| 54 | it. Create a symbolic link to the new location of the
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| 55 | library:</para>
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| 56 |
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| 57 | <para><screen><userinput>ln -sf ../../lib/libz.so.1 /usr/lib/libz.so</userinput></screen></para>
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| 58 |
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| 59 | <para>Zlib does not install its manual page. Issue the
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| 60 | following command to install this documentation:</para>
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| 61 |
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| 62 | <para><screen><userinput>cp zlib.3 /usr/share/man/man3</userinput></screen></para>
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| 63 |
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| 64 | </sect2>
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