Question

The file src/tools/qfeatures.h includes the file src/tools/qconfig.h. By modifying qconfig.h, you can define a
subset of the full Qt functionality that you wish to have available
on your installation.

Note that such modification is only supported on Qt/Embedded
platforms, where reducing the size of Qt is
important and the application-set is often fixed.

The config.h definition file simply defines macros to disable
features. Some features are dependent on other features and these
dependencies are expressed in qfeatures.h.

The available options are:

Macro	Disables	Set automatically by
Images (QImageIO)
QT_NO_IMAGEIO_BMP	The Microsoft Bitmap image file format.
QT_NO_IMAGEIO_PPM	The Portable Pixmap image file format.
QT_NO_IMAGEIO_XBM	The X11 Bitmap image file format.
QT_NO_IMAGEIO_XPM	The X11 Pixmap image file format.
QT_NO_IMAGEIO_PNG	The Portable Network Graphics image file format.
Animation
QT_NO_ASYNC_IO	Asynchronous I/O (QAsyncIO)
QT_NO_ASYNC_IMAGE_IO	Asynchronous Image I/O and GIF image support (QImageDecoder, ...)
QT_NO_MOVIE	Animation support (QMovie)	QT_NO_ASYNC_IO, QT_NO_ASYNC_IMAGE_IO
Fonts
QT_NO_TRUETYPE	TrueType (TTF and TTC) font file format, only used by Qt/Embedded.
QT_NO_BDF	Bitmap Distribution Format (BDF) font file format, only used by Qt/Embedded.
QT_NO_FONTDATABASE	Font database.
Internationalization
QT_NO_I18N	Conversions between Unicode and 8-bit encodings.
QT_NO_UNICODETABLES	Large tables defining such things as upper and lowercase conversions for all Unicode characters.
MIME
QT_NO_MIME	Multipurpose Internet Mail Extensions, an internet standard for encoding and tagging typed data (eg. text, images, colors) (QMimeSource)
QT_NO_RICHTEXT	HTML-like text (QStyleSheet, QLabel)	QT_NO_MIME
QT_NO_DRAGANDDROP	Drag-and-drop data between applications (QDragObject)	QT_NO_MIME
QT_NO_CLIPBOARD	Cut-and-paste data between applications (QClipboard)	QT_NO_MIME
Sound
QT_NO_SOUND	Playing audio files (QSound)
Scipting
QT_NO_PROPERTIES	Scripting of Qt-based applications.
Qt/Embedded-specific
QT_NO_QWS_CURSOR	The cursor sprite on Qt/Embedded. Pen-operated devices would not normally need this feature.
QT_NO_QWS_DEPTH_8GRAYSCALE	8 bits per pixel: 256 levels of gray. Incompatible with QWS_DEPTH_8.
QT_NO_QWS_DEPTH_8	8 bits per pixel: 216-color cube with 40 auxiliary colors. Incompatible with QWS_DEPTH_8GRAYSCALE.
QT_NO_QWS_DEPTH_15	15 bits per pixel: 32 levels for each of red, green and blue.
QT_NO_QWS_DEPTH_16	16 bits per pixel: 64 levels of green, 32 levels for red and for blue.
QT_NO_QWS_DEPTH_32	32 bits per pixel: 256 levels for each of red, green and blue.
QT_NO_QWS_MACH64	Mach64 accelerated driver (demonstration only).
QT_NO_QWS_VFB	Virtual framebuffer running on X11 (see reference documentation).
Networking
QT_NO_NETWORKPROTOCOL	Abstract multi-protocol data retrieval, with local file retrieval included (QNetworkProtocol)
QT_NO_NETWORKPROTOCOL_FTP	FTP-protocol data retrieval.	QT_NO_NETWORKPROTOCOL
QT_NO_NETWORKPROTOCOL_HTTP	HTTP-protocol data retrieval.	QT_NO_NETWORKPROTOCOL
Painting/drawing
QT_NO_COLORNAMES	Color names such as "red", used by some QColor constructors and by some HTML documents (QColor, QStyleSheet)
QT_NO_TRANSFORMATIONS	Used by a number of classes in Qt. With this, rotation and scaling are possible. Without it, only co-ordinate translation (QWMatrix)
QT_NO_PSPRINTER	PostScript printer support.
QT_NO_PRINTER	Printer support (QPrinter)	QT_NO_PSPRINTER (Unix only)
QT_NO_PICTURE	Save Qt drawing commands to a files (QPicture)
Widgets
QT_NO_WIDGETS	Disabling this disables all widgets except QWidget.
QT_NO_TEXTVIEW	HTML document viewing (QTextView)	QT_NO_WIDGETS, QT_NO_RICHTEXT
QT_NO_TEXTBROWSER	HTML document browsing (QTextBrowser)	QT_NO_TEXTVIEW
QT_NO_ICONVIEW	Labelled icons (QIconView)	QT_NO_WIDGETS, QT_NO_DRAGANDDROP
QT_NO_LISTVIEW	Lists of information (QListView)	QT_NO_WIDGETS
QT_NO_CANVAS	Object canvas (QCanvas)	QT_NO_WIDGETS
QT_NO_DIAL	Value control (QDial)	QT_NO_WIDGETS
QT_NO_WORKSPACE	Multi-document interface (QWorkspace)	QT_NO_WIDGETS
QT_NO_LCDNUMBER	LCD-like number display (QLCDNumber)	QT_NO_WIDGETS
GUI Styles
QT_NO_STYLE_WINDOWS	Microsoft Windows style (QWindowsStyle)	QT_NO_WIDGETS
QT_NO_STYLE_MOTIF	OSF Motif style (QMotifStyle)	QT_NO_WIDGETS
QT_NO_STYLE_CDE	Open Group CDE style (QCDEStyle)	QT_NO_STYLE_MOTIF
QT_NO_STYLE_AQUA	MacOS X style (QAquaStyle)
QT_NO_STYLE_PLATINUM	MacOS 9 style (QPlatinumStyle)	QT_NO_WIDGETS
QT_NO_STYLE_SGI	SGI style (QSGIStyle)	QT_NO_STYLE_MOTIF
Dialogs
QT_NO_DIALOGS	Disabling this disables all common dialogs QWidget.	QT_NO_WIDGETS
QT_NO_FILEDIALOG	The file selection dialog (QFileDialog)	QT_NO_DIALOGS, QT_NO_NETWORKPROTOCOL, QT_NO_LISTVIEW
QT_NO_FONTDIALOG	The font selection dialog (QFontDialog)	QT_NO_DIALOGS, QT_NO_FONTDATABASE
QT_NO_COLORDIALOG	The color selection dialog (QColorDialog)	QT_NO_DIALOGS
QT_NO_INPUTDIALOG	Text input dialog (QInputDialog)	QT_NO_DIALOGS
QT_NO_MESSAGEBOX	Message/prompting dialog (QMessageBox)	QT_NO_DIALOGS
QT_NO_PROGRESSDIALOG	Long-computation progress dialog (QProgressDialog)	QT_NO_DIALOGS
QT_NO_TABDIALOG	Tabbed-pages dialog (QTabDialog)	QT_NO_DIALOGS
QT_NO_WIZARD	Multi-step dialog (QWizard)	QT_NO_DIALOGS