OpenSceneGraph Forum

[TheButler]

Classification: UNCLASSIFIED
Caveats: NONE

I'm trying to build the examples under Linux x86_64 under RedHat 5. In
particular, the Qt and FLTK osgviewer examples. I'm using cmake 2.6-patch 4

Qt:
I've got Qt 4.5.2 installed (necessary for OSG) and have built non-OSG
applications with this version of Qt. I did have to install a newer version
of the fontconfig libraries to support Qt 4.5.2. In ccmake for OSG I've
made sure that QT_FONTCONFIG_LIBRARY is set to the right version of the
library (the 2.4.2 I compiled, not the older system one) Yet at link time in
examples/osgviewerQT I get:
/home/butler/src/Qt/qtsdk-2009.03/qt/lib/libQtGui.so: undefined
reference to FcFreeTypeQueryFace This indicates that it is not linking with
the fontconfig library I specified.
Any hints at getting this to link right would be most welcome.

FLTK:
Linking osgviewerFLTK doesn't pick up the -lXft -lXinerama flags needed to
link. The default FLTK 1.3 configuration includes Xft and Xinerama support
at this point. A CMakeList.txt entry for FLTK_XFT_LIBRARY and
FLTK_XINERAMA_LIBRARY would allow proper linking.

Linux:
Clearly RedHat 5 is *not* the linux of choice for OSG. The real question
is: Which distro *is* the preferred one?

Lee

Classification: UNCLASSIFIED
Caveats: NONE





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[Jason Daly]

Butler, Lee Mr CIV USA USAMC wrote:

Quote:

Linux: Clearly RedHat 5 is *not* the linux of choice for OSG. The real question is: Which distro *is* the preferred one?

OSG works fine with Red Hat Enterprise 5, but it may not be the best
distro to use if you need to work with Qt 4.5. I'm not sure why you
felt it necessary to install your own fontconfig. My system shows that
fontconfig 2.4.1 is installed here, and I can't imagine a version that's
only 0.0.1 newer is that different.

Are you sure you need Qt 4.5 for that example? If you just need "a
version" of Qt 4, Red Hat Network has Qt 4.2.1 available, and you can
install it and all of its dependencies by running "yum install qt4"

I'd think FLTK would be fine, too. It might just be that that
particular example needs some work.

--"J"



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[TheButler]

Qt 4.5 came because the osgAdapterWidget code relies on QMdiSubWinodw and QMdiArea which
don't exist in Qt 4.2.1 (the installed Qt on RedHat 5).

Qt 4.5 required a newer version of fontconfig than was in RedHat 5 to avoid the otherwise undefined reference to `FcFreeTypeQueryFace' in libQtGui.so

Lee

----- Original Message -----
From: Jason Daly <>
Date: Tuesday, July 14, 2009 18:58
Subject: Re: Problems building examples (UNCLASSIFIED)
To: OpenSceneGraph Users <>

Quote:

Butler, Lee Mr CIV USA USAMC wrote: Quote: Linux: Clearly RedHat 5 is *not* the linux of choice for OSG. The real question> is: Which distro *is* the preferred one? OSG works fine with Red Hat Enterprise 5, but it may not be the best distro to use if you need to work with Qt 4.5. I'm not sure why you felt it necessary to install your own fontconfig. My system shows that fontconfig 2.4.1 is installed here, and I can't imagine a version that's only 0.0.1 newer is that different. Are you sure you need Qt 4.5 for that example? If you just need "a version" of Qt 4, Red Hat Network has Qt 4.2.1 available, and you can install it and all of its dependencies by running "yum install qt4" I'd think FLTK would be fine, too. It might just be that that particular example needs some work. --"J" openscenegraph.org

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[robertosfield]

Hi Lee,

On Tue, Jul 14, 2009 at 8:22 PM, Butler, Lee Mr CIV USA
USAMC<> wrote:

Quote:

/home/butler/src/Qt/qtsdk-2009.03/qt/lib/libQtGui.so: undefined reference to FcFreeTypeQueryFace This indicates that it is not linking with the fontconfig library I specified. Any hints at getting this to link right would be most welcome.

I'm afraid I'm no Qt expert so will have to defer to others on this issue.

Quote:

FLTK: Linking osgviewerFLTK doesn't pick up the -lXft -lXinerama flags needed to link.  The default FLTK 1.3 configuration includes Xft and Xinerama support at this point.  A CMakeList.txt entry for FLTK_XFT_LIBRARY and FLTK_XINERAMA_LIBRARY would allow proper linking.

Could you post this change to osg-submissions so I can review it.

Quote:

Linux: Clearly RedHat 5 is *not* the linux of choice for OSG.  The real question is:  Which distro *is* the preferred one?

There isn't a preferred choice, it should work across a wide range of
distributions. Good support for any particular distro is really down
to the community to ensure that it works as it's not practical for
engineers like myself to manage dozens of different OS variants. Even
if you use the same OS variant there are still variables such as
optional dependencies like Qt and FLTK that can be thrown into the mix
that make your particular build system unique. The upshot of this is
that to see good support of your chosen build combination then you
need to be prepared to step forward and help ensure that the wrinkles
are all smoothed out.

The alternative to need members of community be proactive would be to
restrict the list of supported OS variants to ones that I can support,
which right now would be... Kubuntu 9.04, while this is fine OS
variant for dev work, it won't be a perfect fit for everyone. I see
this as the beauty of open source - you aren't restricted to arbitrary
choices that I or other core developers make - you have the ability to
tune the software to work well on your own platform of choice ;-)

Robert.


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[René Molenaar]

Which version of cmake are you using? I believe recent versions have updated FindQt modules.
You might want to build qt again with the font libs installed, the configure step can have different
results.

Rene



2009/7/15 Robert Osfield < (

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)>

Quote:

Hi Lee, On Tue, Jul 14, 2009 at 8:22 PM, Butler, Lee Mr CIV USA USAMC< ( Only registered users can see emails on this board! Get registred or enter the forums! )> wrote: Quote:       /home/butler/src/Qt/qtsdk-2009.03/qt/lib/libQtGui.so: undefined reference to FcFreeTypeQueryFace This indicates that it is not linking with the fontconfig library I specified. Any hints at getting this to link right would be most welcome. I'm afraid I'm no Qt expert so will have to defer to others on this issue. Quote: FLTK: Linking osgviewerFLTK doesn't pick up the -lXft -lXinerama flags needed to link.  The default FLTK 1.3 configuration includes Xft and Xinerama support at this point.  A CMakeList.txt entry for FLTK_XFT_LIBRARY and FLTK_XINERAMA_LIBRARY would allow proper linking. Could you post this change to osg-submissions so I can review it. Quote: Linux: Clearly RedHat 5 is *not* the linux of choice for OSG.  The real question is:  Which distro *is* the preferred one? There isn't a preferred choice, it should work across a wide range of distributions.  Good support for any particular distro is really down to the community to ensure that it works as it's not practical for engineers like myself to manage dozens of different OS variants. Even if you use the same OS variant there are still variables such as optional dependencies like Qt and FLTK that can be thrown into the mix that make your particular build system unique.  The upshot of this is that to see good support of your chosen build combination then you need to be prepared to step forward and help ensure that the wrinkles are all smoothed out. The alternative to need members of community be proactive would be to restrict the list of supported OS variants to ones that I can support, which right now would be... Kubuntu 9.04, while this is fine OS variant for dev work, it won't be a perfect fit for everyone.  I see this as the beauty of open source - you aren't restricted to arbitrary choices that I or other core developers make - you have the ability to tune the software to work well on your own platform of choice Robert. _______________________________________________ osg-users mailing list ( Only registered users can see emails on this board! Get registred or enter the forums! ) http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org

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[Jason Daly]

Butler, Lee Mr CIV USA USAMC wrote:

Quote:

Qt 4.5 came because the osgAdapterWidget code relies on QMdiSubWinodw and QMdiArea which don't exist in Qt 4.2.1 (the installed Qt on RedHat 5). Qt 4.5 required a newer version of fontconfig than was in RedHat 5 to avoid the otherwise undefined reference to `FcFreeTypeQueryFace' in libQtGui.so

I did my own digging online, and it looks like you're right. I'm just
surprised that they'd add new symbols to fontconfig without bumping the
middle number.


--"J"




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