source: archive/qt-alternatives.xml

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Last change on this file was 45ab6c7, checked in by Xi Ruoyao <xry111@…>, 5 months ago

more SVN prop clean up

Remove "$LastChanged$" everywhere, and also some unused $Date$

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[ec7940be]1<?xml version="1.0" encoding="ISO-8859-1"?>
2<!DOCTYPE note PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
[f3429309]3 "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
[ec7940be]4 <!ENTITY % general-entities SYSTEM "../general.ent">
5 %general-entities;
6]>
7
8<sect2>
9 <title>Qt Installation Alternatives</title>
10
[f3429309]11 <para>The installation of <application>Qt</application> presents
[ec7940be]12 several challenges and choices. Complicating the Qt installation is the fact
[f3429309]13 that there are two versions, <application>Qt4</application> and
[ec7940be]14 <application>Qt5</application>, that have executable programs with
15 identical names. If both packages are installed on one system,
16 the only methods to manage which set of programs is used is to
17 either control the users' <envar>PATH</envar> or to rename files
18 either directly or via symbolic links. Both packages cannot
19 be installed in the same directory.
20 </para>
21
[f3429309]22 <para>If you are only going to install one of the Qt versions,
23 the choice of installation methods is easier. You can either
[ec7940be]24 install the components in the several directories of the <filename
[f3429309]25 class='directory'>/usr</filename> hierarchy or install the
[0dd2bc6]26 entire package in a separate directory of your choice. <!-- We
[f3429309]27 refer to these options below as "Method 1: Installing in /usr"
[0dd2bc6]28 and "Method 2: Installing in /opt". --></para>
[ec7940be]29
30 <para>If both versions of Qt are to be installed, one or both versions need
31 to be installed in a separate directory. For the purposes here we use the
32 <filename class='directory'>/opt</filename> directory. The selection of
33 which version is being used by individual users on a system is controlled
34 by the <envar>PATH</envar> variable. Other systems can be designed, but
35 the BLFS editors find the <envar>PATH</envar> method easiest.</para>
36
37 <para> The advantage of installing in <filename
38 class='directory'>/usr</filename> is that no updates to the
39 <filename>/etc/ld.so.conf</filename> or
40 <filename>/etc/man_db.conf</filename> files are required. The package files
41 are distributed within several subdirectories of the <filename
42 class='directory'>/usr</filename> hierarchy. This is the method that most
43 commercial distributions use. The disadvantage for BLFS users is that this
44 Qt instance cannot be upgraded while it is in use. For instance, it cannot
45 be upgraded from a running KDE environment. It also precludes having
[f3429309]46 multiple versions of Qt on your system and does not allow reverting to
[ec7940be]47 an existing, known working instance of Qt.</para>
48
49 <para> The advantage of installing <application>Qt</application> in a
[0dd2bc6]50 custom directory such as <filename
51 class='directory'>/opt/qt-&qt4-version;</filename> or <filename
52 class='directory'>/opt/qt-&qt5-version;</filename> is that it keeps all
53 the package files consolidated in a dedicated directory hierarchy. By using
[ec7940be]54 this method, an update can be made without overwriting a previous
55 installation and users can easily revert to a previous version by changing
56 one symbolic link or merely changing the PATH variable. It also allows a
57 developer to maintain multiple versions of <application>Qt4</application>
58 or <application>Qt5</application> for testing. </para>
59
60</sect2>
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