| 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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| 2 | <!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
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| 3 | "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd" [
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| 4 | <!ENTITY % general-entities SYSTEM "../../general.ent">
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| 5 | %general-entities;
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| 6 | ]>
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| 7 |
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| 8 | <chapter id="general-genlib">
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| 9 | <?dbhtml filename="genlib.html"?>
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| 10 | <title>General Libraries</title>
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| 11 |
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| 12 | <para>Libraries contain code which is often required by more than
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| 13 | one program. This has the advantage that each program doesn't need to
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| 14 | duplicate code (and risk introducing bugs), it just has to call
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| 15 | functions from the libraries installed on the system. The most obvious
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| 16 | example of a set of libraries is <application>glibc</application> which is
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| 17 | installed during the <acronym>LFS</acronym> book. This contains all of
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| 18 | the <application>C</application> library functions which programs use.</para>
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| 19 |
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| 20 | <para>There are two types of libraries: static and shared. Shared libraries
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| 21 | (usually <filename>libXXX.so</filename>) are loaded into memory from the shared
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| 22 | copy at runtime (hence the name). Static libraries (<filename>libXXX.a
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| 23 | </filename>) are actually linked into the program executable file itself, thus
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| 24 | making the program file larger. Quite often, you will find both static and
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| 25 | shared copies of the same library on your system.</para>
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| 26 |
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| 27 | <para>Generally, you only need to install libraries when you are
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| 28 | installing software that needs the functionality they supply. In
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| 29 | the <acronym>BLFS</acronym> book, each package is presented with a list of (known)
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| 30 | dependencies. Thus, you can figure out which libraries you need to have
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| 31 | before installing that program. If you are installing something without
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| 32 | using <acronym>BLFS</acronym> instructions, usually the <filename>README</filename>
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| 33 | or <filename>INSTALL</filename> file will contain details of the
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| 34 | program's requirements.</para>
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| 35 |
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| 36 | <para>There are certain libraries which nearly <emphasis>everyone</emphasis>
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| 37 | will need at some point. In this chapter we list these and some others and
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| 38 | explain why you may want to install them.</para>
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| 39 |
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| 40 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="openssl.xml"/>
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| 41 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="pcre.xml"/>
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| 42 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="popt.xml"/>
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| 43 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="slang.xml"/>
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| 44 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="fam.xml"/>
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| 45 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="libxml.xml"/>
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| 46 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="libxml2.xml"/>
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| 47 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="libxslt.xml"/>
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| 48 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="gmp.xml"/>
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| 49 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="gdbm.xml"/>
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| 50 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="glib.xml"/>
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| 51 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="glib2.xml"/>
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| 52 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="libcroco.xml"/>
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| 53 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="expat.xml"/>
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| 54 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="libesmtp.xml"/>
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| 55 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="aspell.xml"/>
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| 56 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="ispell.xml"/>
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| 57 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="guile.xml"/>
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| 58 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="slib.xml"/>
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| 59 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="gwrap.xml"/>
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| 60 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="lzo.xml"/>
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| 61 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="libpcap.xml"/>
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| 62 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="libusb.xml"/>
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| 63 |
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| 64 | </chapter>
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