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when trying to save a png/jpeg snapshot using

paraview-3.2.1  USE="doc examples python qt4 threads -hdf5 -mpi"
or
paraview-3.2.1  USE="doc examples mpi python qt4 threads -hdf5"

the images i get are entirely black. this behavior is reproducible on two
boxes, call them $box1 and $box2:

$box1:
02:00.0 VGA compatible controller: nVidia Corporation GeForce 8800 GT (rev a2)
nvidia-drivers-169.12  USE="acpi gtk -custom-cflags (-multilib)"

$box2:
VGA compatible controller: nVidia Corporation GeForce 8600 GT (rev a1)
nvidia-drivers-169.09-r1  USE="acpi gtk -custom-cflags (-multilib)"

i'm not sure if this is paraview bug, or something that can be fixed within the
ebuild. what i know however is, that at least on $box2 (results for $box1
should be available tomorrow) saving png/jpeg snapshots works with the latest
cvs version of paraview.

$box1:
Portage 2.1.4.4 (default-linux/amd64/2007.0/desktop, gcc-4.1.2, glibc-2.6.1-r0,
2.6.24-gentoo-r3 x86_64)
=================================================================
System uname: 2.6.24-gentoo-r3 x86_64 Intel(R) Xeon(R) CPU E5462 @ 2.80GHz
Timestamp of tree: Sun, 04 May 2008 17:45:01 +0000
app-shells/bash:     3.2_p17-r1
dev-java/java-config: 1.3.7, 2.1.6
dev-lang/python:     2.4.4-r9
dev-python/pycrypto: 2.0.1-r6
sys-apps/baselayout: 1.12.11.1
sys-apps/sandbox:    1.2.18.1-r2
sys-devel/autoconf:  2.13, 2.61-r1
sys-devel/automake:  1.5, 1.6.3, 1.7.9-r1, 1.8.5-r3, 1.9.6-r2, 1.10.1
sys-devel/binutils:  2.18-r1
sys-devel/gcc-config: 1.4.0-r4
sys-devel/libtool:   1.5.26
virtual/os-headers:  2.6.23-r3
ACCEPT_KEYWORDS="amd64"
CBUILD="x86_64-pc-linux-gnu"
CFLAGS="-O2 -march=nocona -pipe"
CHOST="x86_64-pc-linux-gnu"
CONFIG_PROTECT="/etc"
CONFIG_PROTECT_MASK="/etc/env.d /etc/env.d/java/ /etc/fonts/fonts.conf
/etc/gconf /etc/revdep-rebuild /etc/terminfo /etc/texmf/web2c
/etc/udev/rules.d"
CXXFLAGS="-O2 -march=nocona -pipe"
DISTDIR="/var/portage/distfiles"
FEATURES="distlocks metadata-transfer parallel-fetch sandbox sfperms strict
unmerge-orphans userfetch"
GENTOO_MIRRORS="ftp://gd.tuwien.ac.at/opsys/linux/gentoo/
http://mirror.uni-c.dk/pub/gentoo/ http://trumpetti.atm.tut.fi/gentoo/ "
MAKEOPTS="-j9"
PKGDIR="/var/portage/packages"
PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress
--force --whole-file --delete --stats --timeout=180 --exclude=/distfiles
--exclude=/local --exclude=/packages"
PORTAGE_TMPDIR="/var/tmp"
PORTDIR="/var/portage/repos/gentoo"
PORTDIR_OVERLAY="/var/portage/repos/private"
SYNC="rsync://rsync.europe.gentoo.org/gentoo-portage"
USE="X acl acpi alsa amd64 berkdb bluetooth bzip2 cairo cdr cli cracklib crypt
cups dbus dri dvd dvdr dvdread emboss encode esd evo fam firefox fortran gdbm
gif gnome gpm gstreamer gtk hal iconv ipv6 isdnlog java jpeg jpeg2k kerberos
latex libnotify mad midi mikmod mmx mp3 mpeg mudflap ncurses nls nptl nptlonly
ogg opengl openmp pam pcre pdf perl png pppd python qt3support qt4 quicktime
readline reflection sdl session spell spl sse sse2 ssl svg tcpd threads tiff
truetype unicode vim-syntax vorbis xinerama xml xorg xv zlib"
ALSA_CARDS="ali5451 als4000 atiixp atiixp-modem bt87x ca0106 cmipci emu10k1x
ens1370 ens1371 es1938 es1968 fm801 hda-intel intel8x0 intel8x0m maestro3
trident usb-audio via82xx via82xx-modem ymfpci" ALSA_PCM_PLUGINS="adpcm alaw
asym copy dmix dshare dsnoop empty extplug file hooks iec958 ioplug ladspa
lfloat linear meter mulaw multi null plug rate route share shm softvol"
APACHE2_MODULES="actions alias auth_basic authn_alias authn_anon authn_dbm
authn_default authn_file authz_dbm authz_default authz_groupfile authz_host
authz_owner authz_user autoindex cache dav dav_fs dav_lock deflate dir
disk_cache env expires ext_filter file_cache filter headers include info
log_config logio mem_cache mime mime_magic negotiation rewrite setenvif speling
status unique_id userdir usertrack vhost_alias" ELIBC="glibc"
INPUT_DEVICES="keyboard mouse evdev" KERNEL="linux" LCD_DEVICES="bayrad cfontz
cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" USERLAND="GNU"
VIDEO_CARDS="nvidia"
Unset:  CPPFLAGS, CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LANG, LC_ALL,
LDFLAGS, LINGUAS, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS,
PORTAGE_RSYNC_EXTRA_OPTS

$box2:
Portage 2.1.4.4 (default-linux/amd64/2007.0/desktop, gcc-4.1.2, glibc-2.6.1-r0,
2.6.24-gentoo-r3 x86_64)
=================================================================
System uname: 2.6.24-gentoo-r3 x86_64 Intel(R) Core(TM)2 Duo CPU E6550 @
2.33GHz
Timestamp of tree: Sun, 04 May 2008 09:35:01 +0000
app-shells/bash:     3.2_p17-r1
dev-java/java-config: 1.3.7, 2.1.4
dev-lang/python:     2.4.4-r9
dev-python/pycrypto: 2.0.1-r6
sys-apps/baselayout: 1.12.11.1
sys-apps/sandbox:    1.2.18.1-r2
sys-devel/autoconf:  2.13, 2.61-r1
sys-devel/automake:  1.4_p6, 1.5, 1.7.9-r1, 1.8.5-r3, 1.9.6-r2, 1.10.1
sys-devel/binutils:  2.18-r1
sys-devel/gcc-config: 1.4.0-r4
sys-devel/libtool:   1.5.26
virtual/os-headers:  2.6.23-r3
ACCEPT_KEYWORDS="amd64"
CBUILD="x86_64-pc-linux-gnu"
CFLAGS="-march=nocona -O2 -pipe"
CHOST="x86_64-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/kde/3.5/env /usr/kde/3.5/share/config
/usr/kde/3.5/shutdown /usr/share/config /var/lib/hsqldb"
CONFIG_PROTECT_MASK="/etc/env.d /etc/env.d/java/ /etc/fonts/fonts.conf
/etc/gconf /etc/revdep-rebuild /etc/terminfo /etc/texmf/web2c
/etc/udev/rules.d"
CXXFLAGS="-march=nocona -O2 -pipe"
DISTDIR="/var/portage/distfiles"
FEATURES="distlocks metadata-transfer parallel-fetch sandbox sfperms strict
unmerge-orphans userfetch"
GENTOO_MIRRORS="ftp://gd.tuwien.ac.at/opsys/linux/gentoo/
http://mirror.uni-c.dk/pub/gentoo/ http://trumpetti.atm.tut.fi/gentoo/ "
LC_ALL="en_US.utf8"
LINGUAS="en de"
MAKEOPTS="-j3"
PKGDIR="/var/portage/packages"
PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress
--force --whole-file --delete --stats --timeout=180 --exclude=/distfiles
--exclude=/local --exclude=/packages"
PORTAGE_TMPDIR="/var/tmp"
PORTDIR="/var/portage/repos/gentoo"
PORTDIR_OVERLAY="/var/portage/repos/layman/sajinet /var/portage/repos/private"
SYNC="rsync://192.168.0.1/gentoo-portage"
USE="3dnow 3dnowext X a52 aac acpi alsa amd64 berkdb bzip2 cairo caps cddb
cdparanoia cdr cli cracklib crypt cups dbus djvu dri dvd dvdr dvdread eds
emboss encode evo exif fam ffmpeg firefox flac fortran gd gdbm gif gimp gnome
gnome-keyring gphoto2 gpm gstreamer gtk hal hddtemp iconv icu ipod ipv6 isdnlog
java jpeg jpeg2k lcms ldap libnotify lm_sensors mad matroska midi mikmod mmap
mmx mmxext mono mp3 mpeg mudflap musicbrainz ncurses nls nptl nptlonly nvidia
ogg opengl openmp pam pcre pdf perl plotutils png pppd pulseaudio python
qt3support quicktime readline reflection ruby sdl session spell spl sse sse2
ssl ssse3 svg tcpd tetex theora threads tiff tracker truetype unicode usb vcd
vim-syntax vorbis xattr xine xml xorg xv xvid zlib" ALSA_PCM_PLUGINS="adpcm
alaw asym copy dmix dshare dsnoop empty extplug file hooks iec958 ioplug ladspa
lfloat linear meter mulaw multi null plug rate route share shm softvol"
APACHE2_MODULES="actions alias auth_basic authn_alias authn_anon authn_dbm
authn_default authn_file authz_dbm authz_default authz_groupfile authz_host
authz_owner authz_user autoindex cache dav dav_fs dav_lock deflate dir
disk_cache env expires ext_filter file_cache filter headers include info
log_config logio mem_cache mime mime_magic negotiation rewrite setenvif speling
status unique_id userdir usertrack vhost_alias" CAMERAS="canon konica ptp2
kodak" ELIBC="glibc" INPUT_DEVICES="keyboard mouse evdev" KERNEL="linux"
LINGUAS="en de" USERLAND="GNU" VIDEO_CARDS="nvidia nv"
Unset:  CPPFLAGS, CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LANG, LDFLAGS,
PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS

Hi Matthias,

Thanks much for the note. How did you compile the cvs snapshot:
Did you use system jpeg/png/tiff libraries (like the ebuild
does) or the ones supplied by paraview?

Thanks,
Markus

Created an attachment (id=152173) [details]
CMakeCache.txt

> How did you compile the cvs snapshot:
> Did you use system jpeg/png/tiff libraries (like the ebuild
> does) or the ones supplied by paraview?

Actually I used system libraries wherever possible; this includes jpeg/png/tiff
like the ebuild does, but also boost and ffmpeg (seems to work with current cvs
versions). For details please refer to CMakeCache.txt which is attached.

Thanks,
Matthias

Thanks, Matthias. This implies that the issue
is actually within paraview since the cvs version 
seems to work for you. I'll see if I can figure out
what the issue could be. 

Best,
Markus

(In reply to comment #3)
> Thanks, Matthias. This implies that the issue
> is actually within paraview since the cvs version 
> seems to work for you. I'll see if I can figure out
> what the issue could be. 
> 

Hmm, maybe we should better just bump paraview-3.3.0_pre20080505 or something
like that, as if the bug is actually in paraview, this seems to be the most
natural (and least painful) approach. If you want, I can attach an appropriate
ebuild in the next few days...

Yeah, we'll have to see. It depends a lot on how
stable their current cvs version is overall. I don't
use paraview very much in my daily work so it is
hard for me to tell. Maybe scanning the mailing
lists/cvs commits will help digging up a patch for
this specific problem.

Best,
Markus

well, to be honest i don't use paraview very much myself; however, the head of
our research group does, and he told me, that the version i've compiled from
cvs works considerably better than paraview-3.2.1; he did not mention any
regressions. so i think, that hacking together a patch, that may introduce it's
own issues, is not worth the effort; of course, what i'm talking about is the
version i checked out about three days ago. it is therefore possible, that in
the meantime, some regressions have been introduced...

According to the newsgroups the screenshot facility seems 
pretty broken in the latest stable release and compiling cvs 
HEAD looks like the only good alternative short of digging 
up the offending pieces of code and rolling a separate patch.
I'll probably pull a snapshot but will have to test it a bit before
bumping the ebuild.

Thanks,
Markus

thank you very much! if you want me to help with testing, just point me to the
ebuild & the snapshot, so that i can take a look.

btw. i've been trying to assemble an ebuild for the snapshot i'm using...
unfortunately, cmake seems to behave a bit differently when called by portage,
and  i got compile-time failures. as my time is rather limited atm i did not
yet do any further investigations. i'm sorry...

just one minor side-note: when building paraview directly, cmake suggests
compiling with "-DNDEBUG". maybe the ebuild should append this flag...

thanks again,
matthias

I can also confirm this bug on amd64 and x86 machines with paraview-3.2.1 from
portage and the proprietary nvidia drivers. If you switch to the xorg-x11
opengl drivers with eselect, then the screenshots are not black anymore. 

If I use debian on the same machine with the proprietary nvidia drivers and the
debian paraview-3.2.1 package, then the pictures are also not black.

I've just committed paraview-3.3_pre20080514 to portage. It is 
currently hard masked for a bit more testing. So far, everything
seems to work fine for me. Please give it a spin and let me know
of any problems.

Best,
Markus

on amd64:

sci-visualization/paraview-3.3_pre20080514  
USE="mpi qt4 threads -doc -examples -hdf5 -python"

seems to work very well for me; especially, saving jpeg/png snapshots works.

btw: is there a reason you are using "emake -j1"? i've just removed "-j1" and
was able to build paraview with "-j3" on a dual-core  machine ($box2 from
comment 0)... tomorrow i'll try the same on $box1 from comment 0 (8 cores, -j9)
just to be sure.

I am glad to hear it works for you. I'll give it a few
more days of testing and will then unmask it.

Regarding the "-j1": It consistently fails on
my opteron with -j5. If it works for you feel
free to remove it ;)

cheers,
Markus

hmm, for some reason

sci-visualization/paraview-3.3_pre20080514 USE="doc examples python qt4 threads
-hdf5 -mpi"

fails with

"
[ 22%] Building CXX object
VTK/Rendering/Testing/Cxx/CMakeFiles/TestFBOImplementation.dir/TestFBOImplementation.o
/var/tmp/portage/sci-visualization/paraview-3.3_pre20080514/work/ParaView3/VTK/Rendering/Testing/Cxx/TestFBOImplementation.cxx:
In function 'const char* TextureCompressionFormat(GLint)':
/var/tmp/portage/sci-visualization/paraview-3.3_pre20080514/work/ParaView3/VTK/Rendering/Testing/Cxx/TestFBOImplementation.cxx:376:
error: 'COMPRESSED_SRGB_S3TC_DXT1_EXT' is not a member of 'vtkgl'
/var/tmp/portage/sci-visualization/paraview-3.3_pre20080514/work/ParaView3/VTK/Rendering/Testing/Cxx/TestFBOImplementation.cxx:379:
error: 'COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT' is not a member of 'vtkgl'
/var/tmp/portage/sci-visualization/paraview-3.3_pre20080514/work/ParaView3/VTK/Rendering/Testing/Cxx/TestFBOImplementation.cxx:382:
error: 'COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT' is not a member of 'vtkgl'
/var/tmp/portage/sci-visualization/paraview-3.3_pre20080514/work/ParaView3/VTK/Rendering/Testing/Cxx/TestFBOImplementation.cxx:385:
error: 'COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT' is not a member of 'vtkgl'
/var/tmp/portage/sci-visualization/paraview-3.3_pre20080514/work/ParaView3/VTK/Rendering/Testing/Cxx/TestFBOImplementation.cxx:
In function 'const char* InternalTextureFormatToString(int)':
/var/tmp/portage/sci-visualization/paraview-3.3_pre20080514/work/ParaView3/VTK/Rendering/Testing/Cxx/TestFBOImplementation.cxx:571:
error: 'SRGB8' is not a member of 'vtkgl'
[...]
 * 
 * ERROR: sci-visualization/paraview-3.3_pre20080514 failed.
 * Call stack:
 *               ebuild.sh, line   49:  Called src_compile
 *             environment, line 3145:  Called die
 * The specific snippet of code:
 *       emake -j1 || die "emake failed"
"

on $box1 from comment 0 while 

sci-visualization/paraview-3.3_pre20080514  USE="mpi python qt4 threads -doc
-examples -hdf5"

works on $box2 from comment 0. The only difference in USE is mpi; both boxes
use cmake-2.4.6-r1. I'm going to to look into this further...

What OpenGl implementation is used on both machines?

emerge sci-visualization/paraview-3.3_pre20080514  USE="doc examples hdf5
python qt4 threads -mpi" 

with nvidia-drivers:

x11-drivers/nvidia-drivers-169.09-r1  USE="acpi -custom-cflags -gtk
(-multilib)"

seems to solve the problem. I'm able to make some png screenshots without
switching opengl to xorg.

Tobias

(In reply to comment #14)
> What OpenGl implementation is used on both machines?

well, that might make the difference; both use nvidia, but (pasting from
comment 0)

$box1:
02:00.0 VGA compatible controller: nVidia Corporation GeForce 8800 GT (rev a2)
nvidia-drivers-169.12  USE="acpi gtk -custom-cflags (-multilib)"

$box2:
VGA compatible controller: nVidia Corporation GeForce 8600 GT (rev a1)
nvidia-drivers-169.09-r1  USE="acpi gtk -custom-cflags (-multilib)"

the problem is, that i can't downgrade on $box1, because the older drivers just
don't work there at all.

btw.: that i'm getting errors (see comment 13) in

/ParaView3/VTK/Rendering/Testing/Cxx/

seems a bit odd to me, because i did not activate FEATURES="test". maybe the
build gets there anyway - but maybe it should not. thus, i'm going to upgrade
cmake on $box1 (although i use the same version of cmake on $box2) to see if
that helps. if that fails too, i'll try to compile the snapshot manually.

(In reply to comment #16)
> (In reply to comment #14)
> > What OpenGl implementation is used on both machines?
> 
> well, that might make the difference; both use nvidia, but (pasting from
> comment 0)
> 
> $box1:
> 02:00.0 VGA compatible controller: nVidia Corporation GeForce 8800 GT (rev a2)
> nvidia-drivers-169.12  USE="acpi gtk -custom-cflags (-multilib)"
> 
> $box2:
> VGA compatible controller: nVidia Corporation GeForce 8600 GT (rev a1)
> nvidia-drivers-169.09-r1  USE="acpi gtk -custom-cflags (-multilib)"
> 
> the problem is, that i can't downgrade on $box1, because the older drivers just
> don't work there at all.
> 

I have 169.12 and can compile it just fine, so that's probably not
it then. Did you make sure that nvidia's gl libs are selected via
eselect when you compiled it?

Thanks,
Markus

> Did you make sure that nvidia's gl libs are selected via
> eselect when you compiled it?

i'm sure that i didn't change anything opengl-related since the last month,
and:

"
# eselect opengl show
nvidia
"

let's see if it works with another version of cmake...

well, it fails exactly the same way with 

dev-util/cmake-2.4.8  USE="vim-syntax -emacs"

but i can compile it manually without any problems (and -j9).

Created an attachment (id=154073) [details]
CMakeCache.txt used by the ebuild (fails)

Created an attachment (id=154075) [details]
CMakeCache.txt generated manually by ccmake (works)

The diffs between the two cmake cache files are unfortunately
too large for me to track down what the issue may be. If any of
these boxes has vtk installed as well could you remove it
temporarily and see if that helps. There have been weird library
clashes in the past. Otherwise, the only reliable way to track
down the offending piece is to remove all cmake options one at
a time until it compiles (since the vanilla compile seems to
work for some reason).

Best,
Markus

(g)vimdiff is your friend ;-). 

actually i get (compare with the error in comment 13)

"
[ 16%] Building CXX object
VTK/Rendering/CMakeFiles/vtkRendering.dir/vtkOpenGLRenderWindow.o
/home/mlangc/playground/Paraview-markusle/ParaView3/VTK/Rendering/vtkOpenGLRenderWindow.cxx:
In member function 'int
vtkOpenGLRenderWindow::CreateHardwareOffScreenWindow(int, int)':
/home/mlangc/playground/Paraview-markusle/ParaView3/VTK/Rendering/vtkOpenGLRenderWindow.cxx:1640:
error: 'DEPTH_STENCIL_EXT' is not a member of 'vtkgl'
make[2]: ***
[VTK/Rendering/CMakeFiles/vtkRendering.dir/vtkOpenGLRenderWindow.o] Error 1
make[1]: *** [VTK/Rendering/CMakeFiles/vtkRendering.dir/all] Error 2
make: *** [all] Error 2
"

when manually compiling paraview, after applying only this "patch":

"
$ diff -u CMakeCache.txt.box1.manual CMakeCache.txt.box1.portage | grep \
'\<glext.h$'
-VTK_GLEXT_FILE:FILEPATH=/home/mlangc/playground/Paraview-markusle/ParaView3/VTK/Utilities/ParseOGLExt/headers/glext.h
+VTK_GLEXT_FILE:FILEPATH=/usr/include/GL/glext.h
"

thanks for your patience,
matthias

Ahh, thanks for tracking this down. Could you please check
if your installed /usr/include/GL/glext.h is in good
shape? It belongs to eselect-opengl so you may just 
want to re-emerge it. My system glext.h is version 39
and VTK's is slightly newer (version 40) but both
files are virtually identical apart from so comments.

Best,
Markus

now everything becomes clear: 

on $box2 i'm using eselect-opengl-1.0.6-r1 and paraview works. on $box1
however, which is a production machine and doesn't get updated that often, i
was still using eselect-opengl-1.0.5, and:

"
$ cat /usr/lib64/opengl/global/include/glext.h | grep GL_GLEXT_VERSION
#define GL_GLEXT_VERSION 29
"

after upgrading eselect-opengl, i was finally able to emerge
paraview-3.3_pre20080514 on $box1
"
[...]
>>> sci-visualization/paraview-3.3_pre20080514 merged.
"

(with -j9, maybe your parallel build failures are tied to a specific version of
cmake?)

so, i guess adding ">=app-admin/eselect-opengl-1.0.6-r1" (i don't know if it
works with  1.0.6) to DEPEND should finally fix this problem.

thanks,
matthias

Great! I'll add eselect-opengl-1.0.6-r1 as a dependency.
I think the parallel make issues only happen with gcc-4.3.0
probably since the compile timings are different 
(faster/slower, not quite sure which one). 
I still wanted to look into getting the new ebuild compile
against qt-4.4 which currently seems to break things.

Thanks again for your help in debugging this.

Best,
Markus

just a note:

sci-visualization/paraview-3.3_pre20080514  
USE="examples hdf5 python qt4 threads -doc -mpi"

also seems to work fine here:

Portage 2.1.4.4 (default-linux/x86/2006.1/desktop, gcc-4.1.2, glibc-2.7-r2,
2.6.24-gentoo-r7 i686)
=================================================================
System uname: 2.6.24-gentoo-r7 i686 Intel(R) Pentium(R) 4 CPU 3.40GHz
Timestamp of tree: Tue, 27 May 2008 02:45:01 +0000
ccache version 2.4 [disabled]
app-shells/bash:     3.2_p17-r1
dev-java/java-config: 1.3.7, 2.1.6
dev-lang/python:     2.3.5-r3, 2.4.4-r9
dev-python/pycrypto: 2.0.1-r6
dev-util/ccache:     2.4-r7
sys-apps/baselayout: 1.12.11.1
sys-apps/sandbox:    1.2.18.1-r2
sys-devel/autoconf:  2.13, 2.61-r1
sys-devel/automake:  1.5, 1.7.9-r1, 1.8.5-r3, 1.9.6-r2, 1.10.1
sys-devel/binutils:  2.18-r1
sys-devel/gcc-config: 1.4.0-r4
sys-devel/libtool:   1.5.26
virtual/os-headers:  2.6.23-r3
ACCEPT_KEYWORDS="x86"
CBUILD="i686-pc-linux-gnu"
CFLAGS="-O2 -march=prescott -pipe"
CHOST="i686-pc-linux-gnu"
CONFIG_PROTECT="/etc /var/lib/hsqldb"
CONFIG_PROTECT_MASK="/etc/env.d /etc/env.d/java/ /etc/fonts/fonts.conf
/etc/gconf /etc/revdep-rebuild /etc/terminfo /etc/texmf/web2c
/etc/udev/rules.d"
CXXFLAGS="-O2 -march=prescott -pipe"
DISTDIR="/usr/portage/distfiles"
FEATURES="distlocks metadata-transfer sandbox sfperms strict unmerge-orphans
userfetch"
GENTOO_MIRRORS="http://gentoo.ynet.sk/pub"
LC_ALL="en_US.utf8"
MAKEOPTS="-j3"
PKGDIR="/usr/portage/packages"
PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress
--force --whole-file --delete --stats --timeout=180 --exclude=/distfiles
--exclude=/local --exclude=/packages"
PORTAGE_TMPDIR="/var/tmp"
PORTDIR="/usr/portage"
PORTDIR_OVERLAY="/usr/local/portage"
SYNC="rsync://rsync.europe.gentoo.org/gentoo-portage"
USE="X acpi aiglx alsa berkdb browserplugin bzip2 cairo caps cli cracklib crypt
cups dbus dlloader dri dvd dvi emboss encode fam firefox fortran gdbm gif gnome
gpm gstreamer gtk hal iconv ipv6 isdnlog java jpeg ldap mad midi mikmod mmx mp3
mpeg mudflap nautilus ncurses nls nptl nptlonly nsplugin nvidia ogg opengl
openmp pam pcre perl png ppds pppd python quicktime readline reflection ruby
sdl session spell spl sse sse2 ssl svg tcpd threads tiff truetype unicode usb
vim-syntax vorbis win32codecs x86 xinerama xml xorg xprint xv zlib"
APACHE2_MODULES="actions alias auth_basic authn_alias authn_anon authn_dbm
authn_default authn_file authz_dbm authz_default authz_groupfile authz_host
authz_owner authz_user autoindex cache dav dav_fs dav_lock deflate dir
disk_cache env expires ext_filter file_cache filter headers include info
log_config logio mem_cache mime mime_magic negotiation rewrite setenvif speling
status unique_id userdir usertrack vhost_alias" ELIBC="glibc"
INPUT_DEVICES="keyboard mouse" KERNEL="linux" USERLAND="GNU"
VIDEO_CARDS="nvidia"
Unset:  CPPFLAGS, CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LANG, LDFLAGS,
LINGUAS, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS

Thanks much for the note and I've just unmasked paraview.
Qt-4.4 should now also work properly as far as I can tell.

Thanks again for all the help!

Best,
Markus