All,
I am sponsoring this fast track for Stefan Teleman of the
SFW group. The case directory contains this proposal and
a list of deliverables (QT4-Appendix-1.txt). I have set
the timeout for Monday, September 1st, 2008.
The project proposes to deliver the QT4 Framework in a
Micro/Patch release of Solaris. The QT4 Framework is the
cross-platform application development framework toolkit
from Trolltech. The QT4 Framework is the base toolkit
used in KDE. It is at a similar layer as GTK+ is for
GNOME.
Thanks,
John
-------------- next part --------------
?
Including the Trolltech QT4 Framework with Solaris
Stefan Teleman <Stefan.Teleman at Sun.COM>
25 August 2008
1. Summary and motivation
QT4 [1] is the next-generation cross-platform Application
Development Framework Toolkit developed and maintained by
Trolltech, ASA [3]. Trolltech's flagship product, QT4 is
written in C++, and represents the current research
and development achievements at Trolltech. [2]
QT4 is used as a Foundation Application Development
Framework in numerous and highly specialized software
development fields, such as: medical imaging, oil and gas
exploration, computer graphics animations, bio-genetics
research, chemistry and pharmaceutical research, and many
other fields of specialized technical computing.
QT4/X11 uses Xlib. It does not use Xt [ the X Toolkit ],
Motif, Athena, or any other toolkit.
QT/Jambi [4] is a complementary framework to QT4, written
in Java. QT/Jambi will be discussed in a separate ARC Case.
QT4 is supported on the following platforms:
- UNIX: Linux, Solaris, FreeBSD, HP-UX/PA-RISC,
HP-UX/Itanium, AIX and IRIX
- MS Windows: 2000, XP and Vista
- Macintosh: Mac OS X
This Fasttrack proposes the integration of the latest QT4
Release, QT 4.4.1.
This case seeks Micro/Patch release binding.
2. Technical issues
2.1. Key objects
The following table is an abbreviated enumeration of QT4's
delivered objects. For the purposes of maintaining brevity,
a full and complete list of all the objects delivered
by this QT4 Integration will be provided separately, in the
ARC Case Supporting Materials directory, Appendix-1.
For the purposes of this ARC Case, it is to be assumed that,
for any 32-bit executable, or shared object, a corresponding
64-bit object will be delivered by this Integration, in the
Standard Solaris ISA directory location, unless the
functionality provided by the 64-bit object is unnecessary,
in which case the 64-bit object will be omitted from this
Integration.
/usr/qt4/4.4.1/bin/assistant
/usr/qt4/4.4.1/bin/designer
/usr/qt4/4.4.1/bin/linguist
/usr/qt4/4.4.1/bin/lrelease
/usr/qt4/4.4.1/bin/lupdate
/usr/qt4/4.4.1/bin/moc
/usr/qt4/4.4.1/bin/pixeltool
/usr/qt4/4.4.1/bin/qdbus
/usr/qt4/4.4.1/bin/qdbuscpp2xml
/usr/qt4/4.4.1/bin/qdbusviewer
/usr/qt4/4.4.1/bin/qdbusxml2cpp
/usr/qt4/4.4.1/bin/qmake
/usr/qt4/4.4.1/bin/qt3to4
/usr/qt4/4.4.1/bin/qtconfig
/usr/qt4/4.4.1/bin/qtdemo
/usr/qt4/4.4.1/bin/rcc
/usr/qt4/4.4.1/bin/uic
/usr/qt4/4.4.1/bin/uic3
/usr/qt4/4.4.1/doc/html/*.html
/usr/qt4/4.4.1/doc/html/images/*.png
/usr/qt4/4.4.1/include/Qt/
/usr/qt4/4.4.1/include/Qt3Support/
/usr/qt4/4.4.1/include/QtAssistant/
/usr/qt4/4.4.1/include/QtCore/
/usr/qt4/4.4.1/include/QtDBus/
/usr/qt4/4.4.1/include/QtDesigner/
/usr/qt4/4.4.1/include/QtGui/
/usr/qt4/4.4.1/include/QtNetwork/
/usr/qt4/4.4.1/include/QtOpenGL/
/usr/qt4/4.4.1/include/QtScript/
/usr/qt4/4.4.1/include/QtSql/
/usr/qt4/4.4.1/include/QtSvg/
/usr/qt4/4.4.1/include/QtTest/
/usr/qt4/4.4.1/include/QtUiTools/
/usr/qt4/4.4.1/include/QtXml/
/usr/qt4/4.4.1/lib/libQt3Support.so.4.4.1
/usr/qt4/4.4.1/lib/libQtAssistantClient.so.4.4.1
/usr/qt4/4.4.1/lib/libQtCore.so.4.4.1
/usr/qt4/4.4.1/lib/libQtDBus.so.4.4.1
/usr/qt4/4.4.1/lib/libQtDesigner.so.4.4.1
/usr/qt4/4.4.1/lib/libQtDesignerComponents.so.4.4.1
/usr/qt4/4.4.1/lib/libQtGui.so.4.4.1
/usr/qt4/4.4.1/lib/libQtNetwork.so.4.4.1
/usr/qt4/4.4.1/lib/libQtOpenGL.so.4.4.1
/usr/qt4/4.4.1/lib/libQtScript.so.4.4.1
/usr/qt4/4.4.1/lib/libQtSql.so.4.4.1
/usr/qt4/4.4.1/lib/libQtSvg.so.4.4.1
/usr/qt4/4.4.1/lib/libQtTest.so.4.4.1
/usr/qt4/4.4.1/lib/libQtXml.so.4.4.1
/usr/qt4/4.4.1/plugins/accessible/libqtaccessiblecompatwidgets.so
/usr/qt4/4.4.1/plugins/accessible/libqtaccessiblewidgets.so
/usr/qt4/4.4.1/plugins/codecs/libqcncodecs.so
/usr/qt4/4.4.1/plugins/codecs/libqjpcodecs.so
/usr/qt4/4.4.1/plugins/codecs/libqkrcodecs.so
/usr/qt4/4.4.1/plugins/codecs/libqtwcodecs.so
/usr/qt4/4.4.1/plugins/designer/libarthurplugin.so
/usr/qt4/4.4.1/plugins/designer/libcontainerextension.so
/usr/qt4/4.4.1/plugins/designer/libcustomwidgetplugin.so
/usr/qt4/4.4.1/plugins/designer/libqt3supportwidgets.so
/usr/qt4/4.4.1/plugins/designer/libtaskmenuextension.so
/usr/qt4/4.4.1/plugins/designer/libworldtimeclockplugin.so
/usr/qt4/4.4.1/plugins/iconengines/libqsvg.so
/usr/qt4/4.4.1/plugins/imageformats/libqgif.so
/usr/qt4/4.4.1/plugins/imageformats/libqjpeg.so
/usr/qt4/4.4.1/plugins/imageformats/libqmng.so
/usr/qt4/4.4.1/plugins/imageformats/libqsvg.so
/usr/qt4/4.4.1/plugins/imageformats/libqtiff.so
/usr/qt4/4.4.1/plugins/inputmethods/libqimsw-multi.so
/usr/qt4/4.4.1/plugins/phonon_backend/libphonon_gstreamer.so
/usr/qt4/4.4.1/plugins/sqldrivers/libqsqlite.so
/usr/qt4/4.4.1/plugins/sqldrivers/libqsqlmysql.so
/usr/qt4/4.4.1/plugins/sqldrivers/libqsqlodbc.so
/usr/qt4/4.4.1/plugins/sqldrivers/libqsqlpsql.so
/usr/qt4/4.4.1/share/mkspecs/solaris-cc/qmake.conf
/usr/qt4/4.4.1/share/mkspecs/solaris-cc/qplatformdefs.h
/usr/qt4/4.4.1/share/mkspecs/solaris-cc-64/qmake.conf
/usr/qt4/4.4.1/share/mkspecs/solaris-cc-64/qplatformdefs.h
QT4 is thread-safe, 64-bit clean and largefile aware. The 64-bit
QT4 libraries, the associated loadable shared objects [ plugins ]
and the necessary 64-bit executables will be delivered with this
Integration.
2.2. C++ ABI Considerations
The C++ Language Standard [ ISO/IEC 14882:2003 ] [8] did not
define an ABI for the C++ Programming Language. Although several
efforts aimed at defining a common C++ ABI have existed in
the past, no consensus was ever reached. As a direct result of
this lack of an unified C++ ABI, binary object code emitted by
different C++ compilers is not interchangeable, and is likely
to be binary incompatible across different C++ Compilers, or
different Minor or Major releases of the same C++ Compiler, or
across different C++ runtime environments. Simply put, binary
object code resulting from the compilation of C++ Language code
is dependent on, and tied to, the compiler emitting it, and to the
compiler which has emitted the binary object code for the C++
runtime, and for the Standard C++ Library.
The PSARC Opinion from PSARC/2002/348 [6] is the Defining Reference
for this ARC Case. PSARC 2002/348 mandates that all C++ software
which exposes public API's in Solaris must be compiled with the Sun
Studio Compilers, and with Version 5 of the Sun C++ ABI.
For the purposes of delivering and maintaining a coherent,
consistent and compatible C++ ABI, this Integration of QT4
will be built with the Sun Studio compiler suite, which has
maintained C++ ABI compatibility since Release 5.0
[ Workshop 5 ]. [7] [8]
The Sun Studio compilers are supported by Trolltech ASA.
2.3. Programmatic facilities
QT4 follows the "component object development model", suitable
for an object-oriented framework. In addition, QT4 has extended
the inherently statically typed C++ Object Model by implementing
the QObject base type as the "Root Object" of [ almost ] all
QT4 types. By design, and unlike Smalltalk or Java, C++ does
not provide a toplevel "object" type functioning as root of
the inheritance graph. The omission of this "root object" type
from the design of the C++ Language was intentional: one of
C++'s stated goals was type safety, and the implementation
of such an Object Type, if deemed necessary, was delegated to
the writer of the application, or framework. A direct consequence
of this design decision is that, in C++, object types are not
related to each other by language design [ unlike Smalltalk or
Java ]. As a result, in C++, object types can only "talk" to
their "relatives" if a relationship already exists [ which assumes
that the objects involved in sending or receiving messages are
related, or can type-convert ], or, absent such a relationship,
a message-passing facility between statically typed, unrelated
object types has been devised.
One approach to solving this problem is described in the "Design
Patterns [ GoF ] Book [5], and a canonical example of such
a double-dispatch implementation are the Mediator and Observer
Patterns.
The QT4 Object Model implements the "root object" pattern, and
the Message Passing facility is achieved via QT4's signal/slot
mechanism.
QT4's signal/slot mechanism is type safe: the method signature
of a signal must match the method signature of the receiving
slot. Method signature mistmatches are detected by the compiler,
at compile-time. Signals and slots are loosely coupled: an Object
Type emitting a signal does not know, nor does it care, which
slot receives its signal: the connection between a signal and
a slot must be explicitly defined by the application. [6]
The runtime signal/slot type safety mechanism is enforced by
the supporting meta-object generated by the Meta-Object Compiler
[ moc ]. The Meta-Object Compiler generates additional methods
for each particular object type's signal/slot declarations.
QT4 provides a rich feature set of client-server connectivity
and external component integration facilities: database
connectivity, either via UnixODBC [11] plugins, or via specific
database engine plugins: MySQL5 [12], PostgreSQL [13],
SQLite3 [14], printing [ via CUPS [10] ], and Desktop IPC
integration [ via D-BUS [15] ].
QT4 provides a QT3 compatibility layer, and a QT3 migration
toolkit. [5] There are no plans for integrating QT3 in Solaris
at this time.
2.4. Language Bindings
QT4 is written in a subset of Standard C++ [8] which has been
known to be portable across all the platforms and compilers
supported by Trolltech ASA. Sun Studio is one of the supported
compiler sets. A complete list of all platforms and compilers
supported by Trolltech ASA is available at
http://doc.trolltech.com/4.4/supported-platforms.html. [17]
2.5. Internationalization
QT4 supports Internationalization and multibyte characters
by default, via full Unicode [16] support [ QT4 supports
both Unicode and non-Unicode fonts]. The "linguist" QT4
application is an intuitive GUI application which reads
extracted source text, and provides context information ready
for translation. The "linguist" application will output a
translation file ready for internationalized application use.
QT4 provides on-the-spot editing support for the X Input
Method Extension.
2.6. Documentation
The canonical QT4 release delivers a complete documentation
set in HTML format. QT4 does not provide documentation in UNIX
Manual format. A generic UNIX man page [ qt4.4qt ] providing
pointers to the installed HTML Documentation will be provided
with this Integration.
The HTML QT4 documentation is accessible either via a Web
Browser, or via QT4's 'assistant' application.
3. Interfaces
3.1. Interface Stability
QT4 maintains API and ABI compatibility between Micro Releases,
but not between Minor and/or Major Releases. However,
Trolltech ASA provides API and ABI compatibility guarantees
within the boundaries of a QT4 Micro Release. It is very likely
that several QT4 Integrations, which may be binary incompatible
with each other, will have to coexist: Developer Preview Releases
of QT 4.4 and QT 4.5/4.6 are already available for download from
Trolltech.
This Fasttrack proposes an overall "Uncommitted" Interface
Stability Classification for QT4. Considering the ABI Micro
Release Stability guarantee provided by Trolltech ASA, a
"Committed" Interface Stability Classification would have been
appropriate. However, QT4's dependency on
External/Evolving/Uncommitted Interfaces makes an overall
"Committed" Interface Classification inaproppriate.
Furthermore, QT4 will follow a directory layout structure
modeled after Perl 5 [ PSARC/1999/192 [7] ]:
/usr/qt4/[version]/bin
/usr/qt4/[version]/bin/${MACH64}/
/usr/qt4/[version]/lib
/usr/qt4/[version]/lib/${MACH64}/
/usr/qt4/[version]/include
[ ... ]
3.2. Imported Interfaces
QT4 imports interfaces from the Standard C Library, Standard
Math Library, and the POSIX Threads Library. In addition, QT4
imports Interfaces from the Standard C++ Library, the C++
Runtime Library, the Socket Library, the Network Services
Library, and a number of X11, OpenGL and graphics libraries
[ LibPNG, LibTIFF, LibJPEG, LibMNG ]. QT4 also imports
interfaces from CUPS [10] UnixODBC [11] and D-BUS [15].
Optionally, and a highly desirable feature set, QT4 can
directly import interfaces from MySQL5 [12], PostgreSQL [13]
and SQLite3 [14], bypassing UnixODBC [11] altogether.
NAME STABILITY NOTES
SUNWlibC Committed LSARC/2004/284
LibPNG Evolving LSARC/2003/085
LibTIFF Evolving LSARC/2003/085
LibJPEG Evolving LSARC/2003/085
LibMNG Uncommitted PSARC/2008/072
LibXPM Evolving PSARC/2001/060
Z-Lib Committed PSARC/2006/537
LibFreetype2 External LSARC/2005/397
LibFontconfig External LSARC/2003/273
LibXFT External LSARC/2003/274
LibX11 External LSARC/2004/685
LibXRender External LSARC/2004/685
LibXRandR External LSARC/2004/685
CUPS Uncommitted PSARC/2008/130
UnixODBC Uncommitted LSARC/2007/684
D-BUS External LSARC/2006/368
SQLite3 Uncommitted PSARC/2008/120
MySQL5 Uncommitted LSARC/2007/608
MySQL5 [ 64-bit ] Uncommitted LSARC/2008/150
PostgreSQL 8.3 Uncommitted LSARC/2008/004
PostgreSQL [ 64-bit ] Uncommitted LSARC/2007/553
OpenSSL Uncommitted PSARC/2003/500
OpenSSL [ 64-bit ] Uncommitted PSARC/2004/768
GStreamer Uncommitted LSARC/2004/713
3.3. Exported Interfaces
For the purposes of this document, the abbreviation [$QT4]
refers to the toplevel directory location of a particular
QT4 [ Major.Minor.Micro ] Integration.
NAME STABILITY NOTES
SUNWqt441core Uncommitted Package Name
SUNWqt441demo Uncommitted Package Name
SUNWqt441doc Uncommitted Package Name
SUNWqt441usr Uncommitted Package Name
[$QT4]/bin/assistant Uncommitted Executable location
[$QT4]/bin/designer Uncommitted Executable location
[$QT4]/bin/linguist Uncommitted Executable location
[$QT4]/bin/lrelease Uncommitted Executable location
[$QT4]/bin/lupdate Uncommitted Executable location
[$QT4]/bin/moc Uncommitted Executable location
[$QT4]/bin/pixeltool Uncommitted Executable location
[$QT4]/bin/qdbus Uncommitted Executable location
[$QT4]/bin/qdbuscpp2xml Uncommitted Executable location
[$QT4]/bin/qdbusviewer Uncommitted Executable location
[$QT4]/bin/qdbusxml2cpp Uncommitted Executable location
[$QT4]/bin/qmake Uncommitted Executable location
[$QT4]/bin/qt3to4 Uncommitted Executable location
[$QT4]/bin/qtconfig Uncommitted Executable location
[$QT4]/bin/qtdemo Uncommitted Executable location
[$QT4]/bin/rcc Uncommitted Executable location
[$QT4]/bin/uic Uncommitted Executable location
[$QT4]/bin/uic3 Uncommitted Executable location
[$QT4]/bin/${MACH64}/designer Uncommitted Executable location
[$QT4]/bin/${MACH64}/pixeltool Uncommitted Executable location
[$QT4]/bin/${MACH64}/qdbus Uncommitted Executable location
[$QT4]/bin/${MACH64}/qdbuscpp2xml Uncommitted Executable
location
[$QT4]/bin/${MACH64}/qdbusviewer Uncommitted Executable
location
[$QT4]/bin/${MACH64}/qdbusxml2cpp Uncommitted Executable
location
[$QT4]/bin/${MACH64}/qt3to4 Uncommitted Executable location
[$QT4]/bin/${MACH64}/qtconfig Uncommitted Executable location
[$QT4]/bin/${MACH64}/qtdemo Uncommitted Executable location
[$QT4]/doc/html/*.html Uncommitted HTML Documentation
[$QT4]/doc/html/images/*.png Uncommitted Documentation Graphics
[$QT4]/include/Qt/ Uncommitted Header files
[$QT4]/include/Qt3Support/ Uncommitted Header files
[$QT4]/include/QtAssistant/ Uncommitted Header files
[$QT4]/include/QtCore/ Uncommitted Header files
[$QT4]/include/QtDBus/ Uncommitted Header files
[$QT4]/include/QtDesigner/ Uncommitted Header files
[$QT4]/include/QtGui/ Uncommitted Header files
[$QT4]/include/QtNetwork/ Uncommitted Header files
[$QT4]/include/QtOpenGL/ Uncommitted Header files
[$QT4]/include/QtScript/ Uncommitted Header files
[$QT4]/include/QtSql/ Uncommitted Header files
[$QT4]/include/QtSvg/ Uncommitted Header files
[$QT4]/include/QtTest/ Uncommitted Header files
[$QT4]/include/QtUiTools/ Uncommitted Header files
[$QT4]/include/QtWebKit/ Uncommitted Header files
[$QT4]/include/QtXml/ Uncommitted Header files
[$QT4]/include/QtXmlPatterns/ Uncommitted Header files
[$QT4]/lib/libQt3Support.so.4.4.1 Uncommitted Shared Library
[$QT4]/lib/libQt3Support.so.4 Uncommitted SONAME
[$QT4]/lib/libQtAssistantClient.so.4.4.1 Shared Library
[$QT4]/lib/libQtAssistantClient.so.4 Uncommitted SONAME
[$QT4]/lib/libQtCore.so.4.4.1 Uncommitted Shared Library
[$QT4]/lib/libQtCore.so.4 Uncommitted SONAME
[$QT4]/lib/libQtDBus.so.4.4.1 Uncommitted Shared Library
[$QT4]/lib/libQtDBus.so.4 Uncommitted SONAME
[$QT4]/lib/libQtDesigner.so.4.4.1 Uncommitted Shared Library
[$QT4]/lib/libQtDesigner.so.4 Uncommitted SONAME
[$QT4]/lib/libQtDesignerComponents.so.4.4.1 Uncommitted Shared
Library
[$QT4]/lib/libQtDesignerComponents.so.4 Uncommitted SONAME
[$QT4]/lib/libQtGui.so.4.4.1 Uncommitted Shared Library
[$QT4]/lib/libQtGui.so.4 Uncommitted SONAME
[$QT4]/lib/libQtNetwork.so.4.4.1 Uncommitted Shared Library
[$QT4]/lib/libQtNetwork.so.4 Uncommitted SONAME
[$QT4]/lib/libQtOpenGL.so.4.4.1 Uncommitted Shared Library
[$QT4]/lib/libQtOpenGL.so.4 Uncommitted SONAME
[$QT4]/lib/libQtScript.so.4.4.1 Uncommitted Shared Library
[$QT4]/lib/libQtScript.so.4 Uncommitted SONAME
[$QT4]/lib/libQtSql.so.4.4.1 Uncommitted Shared Library
[$QT4]/lib/libQtSql.so.4 Uncommitted SONAME
[$QT4]/lib/libQtSvg.so.4.4.1 Uncommitted Shared Library
[$QT4]/lib/libQtSvg.so.4 Uncommitted SONAME
[$QT4]/lib/libQtTest.so.4.4.1 Uncommitted Shared Library
[$QT4]/lib/libQtTest.so.4 Uncommitted SONAME
[$QT4]/lib/libQtWebKit.so.4.4.1 Uncommitted Shared Library
[$QT4]/lib/libQtWebKit.so.4 Uncommitted SONAME
[$QT4]/lib/libQtXml.so.4.4.1 Uncommitted Shared Library
[$QT4]/lib/libQtXml.so.4 Uncommitted SONAME
[$QT4]/lib/libQtXmlPatterns.so.4.4.1 Uncommitted Shared Library
[$QT4]/lib/libQtXmlPatterns.so.4 Uncommitted SONAME
[$QT4]/lib/${MACH64}/*.so.4.4.1 Uncommitted Shared Library
[$QT4]/lib/${MACH64}/*.so.4 Uncommitted SONAME
[$QT4]/plugins/accessible/*.so Project Private QT4 Plugins
[$QT4]/plugins/codecs/*.so Project Private QT4 Plugins
[$QT4]/plugins/designer/*.so Project Private QT4 Plugins
[$QT4]/plugins/iconengines/*.so Project Private QT4 Plugins
[$QT4]/plugins/imageformats/*.so Project Private QT4 Plugins
[$QT4]/plugins/inputmethods/*.so Project Private QT4 Plugins
[$QT4]/plugins/sqldrivers/*.so Project Private QT4 Plugins
[$QT4]/plugins/${MACH64}/*/*.so Project Private QT4 Plugins
[$QT4]/share/mkspecs/solaris-cc/qmake.conf Uncommitted QT4
qmake compiler configuration [ 32-bit ]
[$QT4]/share/mkspecs/solaris-cc/qplatformdefs.h Project Private QT4
Platform-specific header file
[$QT4]/share/mkspecs/solaris-cc-64/qmake.conf Uncommitted QT4
qmake compiler configuration [ 64-bit ]
[$QT4]/share/mkspecs/solaris-cc-64/qplatformdefs.h Project Private
QT4 Platform-specific header file
[$QT4]/share/phrasebooks/danish.qph Project Private QT4
Phrasebook File
[$QT4]/share/phrasebooks/dutch.qph Project Private QT4
Phrasebook File
[$QT4]/share/phrasebooks/finnish.qph Project Private QT4
Phrasebook File
[$QT4]/share/phrasebooks/french.qph Project Private QT4
Phrasebook File
[$QT4]/share/phrasebooks/german.qph Project Private QT4
Phrasebook File
[$QT4]/share/phrasebooks/italian.qph Project Private QT4
Phrasebook File
[$QT4]/share/phrasebooks/japanese.qph Project Private QT4
Phrasebook File
[$QT4]/share/phrasebooks/norwegian.qph Project Private QT4
Phrasebook File
[$QT4]/share/phrasebooks/polish.qph Project Private QT4
Phrasebook File
[$QT4]/share/phrasebooks/russian.qph Project Private QT4
Phrasebook File
[$QT4]/share/phrasebooks/swedish.qph Project Private QT4
Phrasebook File
4. References
[1] http://trolltech.com/products/qt
[2] http://trolltech.com/pdf/qt43-whitepaper-a4.pdf
[3] http://trolltech.com/
[4] http://trolltech.com/products/qt/jambi/
[5] http://trolltech.com/products/qt/qt3
[6] http://www.opensolaris.org/os/community/arc/caselog/2002/
PSARC/2002/348
[7] http://www.opensolaris.org/os/community/arc/caselog/1999/
PSARC/1999/192
[8] http://www.open-std.org/jtc1/sc22/wg21/
[9] Sun C++ ABI 5.0:
LSARC/1994/323
LSARC/1997/150
LSARC/2000/211 et seq.
[10] http://www.cups.org/
[11] http://www.unixodbc.org/
[12] http://www.mysql.com/
[13] http://www.postgresql.org/
[14] http://www.sqlite.org/
[15] http://www.freedesktop.org/wiki/Software/dbus
[16] http://www.unicode.org/
[17] http://doc.trolltech.com/4.4/supported-platforms.html
