I switch yesterday to the 4.2.1 tag in svn, but couldn't recompile.

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Linking CXX shared library ../../lib/libnepomuk.so
CMakeFiles/nepomuk.dir/resourcedata.o: In function `QHash::findNode(QUrl const&, unsigned int*) const':
resourcedata.cpp:(.text._ZNK5QHashI4QUrlN7Nepomuk7VariantEE8findNodeERKS0_Pj[QHash::findNode(QUrl const&, unsigned int*) const]+0x1b): undefined reference to `qHash(QUrl const&)'
CMakeFiles/nepomuk.dir/ontology/ontology.o: In function `QHash::findNode(QUrl const&, unsigned int*) const':
/usr/include/qt4/QtCore/qhash.h:854: undefined reference to `qHash(QUrl const&)'
CMakeFiles/nepomuk.dir/ontology/ontology.o: In function `QHash::findNode(QUrl const&, unsigned int*) const':
/usr/include/qt4/QtCore/qhash.h:854: undefined reference to `qHash(QUrl const&)'
CMakeFiles/nepomuk.dir/ontology/class.o: In function `QHash::findNode(QUrl const&, unsigned int*) const':
/usr/include/qt4/QtCore/qhash.h:854: undefined reference to `qHash(QUrl const&)'
CMakeFiles/nepomuk.dir/ontology/ontologymanager.o: In function `QHash::findNode(QUrl const&, unsigned int*) const':
ontologymanager.cpp:(.text._ZNK5QHashI4QUrlN7Nepomuk8OntologyEE8findNodeERKS0_Pj[QHash::findNode(QUrl const&, unsigned int*) const]+0x1b): undefined reference to `qHash(QUrl const&)'
CMakeFiles/nepomuk.dir/ontology/ontologymanager.o:ontologymanager.cpp:(.text._ZNK5QHashI4QUrlN7Nepomuk5ClassEE8findNodeERKS0_Pj[QHash::findNode(QUrl const&, unsigned int*) const]+0x1b): more undefined references to `qHash(QUrl const&)' follow
collect2: ld returned 1 exit status
make[2]: *** [lib/libnepomuk.so.4.2.0] Error 1
make[1]: *** [nepomuk/core/CMakeFiles/nepomuk.dir/all] Error 2
make: *** [all] Error 2
makeobj[0]: Leaving directory `/home/kde-devel/kde/build/KDE/kdelibs'

qt version is 4.4.3 and gcc 4.2.4

This setup worked for 4.2.0. Do i need a patched qt 4.4 or even qt 4.5?

Qt 4.4 is sufficient. You may need to reconfigure using CMake to ensure that everything was fully updated.

I deleted the build files from KDE4.2.0 some time ago. So there shouldn't be anything misconfiguring.
svn stat has no output, so it should be as clean as a fresh checkout.

I switched back to 4.2.0 tag and rebuild to see if it still works and it does (it is still building but nepomuk worked). So some changes don't like my system.

Can anybody help?

Try this in Konsole before configuring with CMake:

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export CMAKE_PREFIX_PATH=[where kde 4.2.1 is installed]

AFAIS, There is no qHash(QUrl) in Qt 4.4. So, it has to be declared somewhere in kdelibs or somewhere else. Just guessing: Is it the correct build order: kdesupport, kdelibs, kdepimlibs, ...?

bcooksley wrote:Try this in Konsole before configuring with CMake:

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export CMAKE_PREFIX_PATH=[where kde 4.2.1 is installed]

I get the same error message. Nothing changed.

msoeken wrote:AFAIS, There is no qHash(QUrl) in Qt 4.4. So, it has to be declared somewhere in kdelibs or somewhere else. Just guessing: Is it the correct build order: kdesupport, kdelibs, kdepimlibs, ...?

I don't build kdesupport. I use binary packages. But that could be the problem. I will try to build tags/kdesupport-for-4.2/kdesupport. Hope that's the problem.

EDIT: Now it works. It seems an old version of soprano caused the trouble. Thanks for helping.