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<section xmlns="http://docbook.org/ns/docbook"
xmlns:xlink="http://www.w3.org/1999/xlink"
xml:id="sec-language-qt">
<title>Qt</title>
<para>The information in this section applies to Qt 5.5 and later.</para>
<para>Qt is an application development toolkit for C++. Although it is
not a distinct programming language, there are special considerations
for packaging Qt-based programs and libraries. A small set of tools
and conventions has grown out of these considerations.</para>
<section xml:id="ssec-qt-libraries"><title>Libraries</title>
<para>Packages that provide libraries should be listed in
<varname>qt5LibsFun</varname> so that the library is built with each
Qt version. A set of packages is provided for each version of Qt; for
example, <varname>qt5Libs</varname> always provides libraries built
with the latest version, <varname>qt55Libs</varname> provides
libraries built with Qt 5.5, and so on. To avoid version conflicts, no
top-level attributes are created for these packages.</para>
</section>
<section xml:id="ssec-qt-programs"><title>Programs</title>
<para>Application packages do not need to be built with every Qt
version. To ensure consistency between the package's dependencies,
call the package with <literal>qt5Libs.callPackage</literal> instead
of the usual <literal>callPackage</literal>. An older version may be
selected in case of incompatibility. For example, to build with Qt
5.5, call the package with
<literal>qt55Libs.callPackage</literal>.</para>
<para>Several environment variables must be set at runtime for Qt
applications to function correctly, including:</para>
<itemizedlist>
<listitem><para><envar>QT_PLUGIN_PATH</envar></para></listitem>
<listitem><para><envar>QML_IMPORT_PATH</envar></para></listitem>
<listitem><para><envar>QML2_IMPORT_PATH</envar></para></listitem>
<listitem><para><envar>XDG_DATA_DIRS</envar></para></listitem>
</itemizedlist>
<para>To ensure that these are set correctly, the program must be wrapped by
invoking <literal>wrapQtProgram <replaceable>program</replaceable></literal>
during installation (for example, during
<literal>fixupPhase</literal>). <literal>wrapQtProgram</literal>
accepts the same options as <literal>makeWrapper</literal>.
</para>
</section>
<section xml:id="ssec-qt-kde"><title>KDE</title>
<para>Many of the considerations above also apply to KDE packages,
especially the need to set the correct environment variables at
runtime. To ensure that this is done, invoke <literal>wrapKDEProgram
<replaceable>program</replaceable></literal> during
installation. <literal>wrapKDEProgram</literal> also generates a
<literal>ksycoca</literal> database so that required data and services
can be found. Like its Qt counterpart,
<literal>wrapKDEProgram</literal> accepts the same options as
<literal>makeWrapper</literal>.</para>
</section>
</section>
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