source: archive/setqt.xml@ 45ab6c7

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<sect3>
    <title>Choosing Qt Program Versions</title>

    <para>If you install both Qt4 and Qt5, you can use some simple
    scripts to select the currently active set of Qt programs.  As the
    <systemitem class="username">root</systemitem> user, create
    the following scripts:</para>

<screen role="root"><userinput>cat &gt; /usr/bin/setqt4 &lt;&lt; 'EOF'
<literal>if [ "x$QT5DIR" != "x/usr" ] &amp;&amp; [ "x$QT5DIR" != "x" ]; then pathremove  $QT5DIR/bin; fi
if [ "x$QT4DIR" != "x/usr" ]; then pathprepend $QT4DIR/bin; fi
echo $PATH</literal>
EOF</userinput></screen>

<screen role="root"><userinput>cat &gt; /usr/bin/setqt5 &lt;&lt; 'EOF'
<literal>if [ "x$QT4DIR" != "x/usr" ] &amp;&amp; [ "x$QT4DIR" != "x" ]; then pathremove  $QT4DIR/bin; fi
if [ "x$QT5DIR" != "x/usr" ]; then pathprepend $QT5DIR/bin; fi
echo $PATH</literal>
EOF</userinput></screen>

    <para>You should now be able to use the appropriate Qt version by running
    <command>source setqt4</command> or <command>source setqt5</command> as
    desired. (Setting the PATH wont work in a subshell.) Another technique that
    can be used is to create appropriate alias additions to your ~/.bashrc like
    <command>alias setqt4='source setqt4'</command>.</para>

</sect3>