So i've built KDE from master using kdesrc-build, and i'm having troubles starting nepomuk, it conmplains about missing virtuoso backend.

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NepomukServer(19918)/nepomuk (server) Nepomuk2::Server::enableNepomuk: enableNepomuk true
NepomukServer(19918)/nepomuk (server) Nepomuk2::ServiceManager::Private::startService: "nepomukfileindexer"
NepomukServer(19918)/nepomuk (server) Nepomuk2::ServiceManager::Private::startService: Queueing "nepomukfileindexer" due to dependency "nepomukstorage"
NepomukServer(19918)/nepomuk (server) Nepomuk2::ServiceManager::Private::startService: "nepomukstorage"
NepomukServer(19918)/nepomuk (server) Nepomuk2::ServiceController::start: Starting "nepomukstorage"
NepomukServer(19918)/nepomuk (server) Nepomuk2::ServiceManager::Private::startService: "nepomukstorage"
NepomukServer(19918)/nepomuk (server) Nepomuk2::ServiceManager::Private::startService: "nepomukfilewatch"
NepomukServer(19918)/nepomuk (server) Nepomuk2::ServiceManager::Private::startService: Queueing "nepomukfilewatch" due to dependency "nepomukstorage"
NepomukServer(19918)/nepomuk (server) Nepomuk2::ServiceController::slotServiceRegistered: "org.kde.nepomuk.services.nepomukstorage"
[/home/hrvoje/kdelocal/bin/nepomukservicestub] nepomukstorage(19920)/nepomuk (storage service) Nepomuk2::Storage::slotNepomukCoreInitialized: Failed to initialize nepomuk core
NepomukServer(19918)/nepomuk (server) Nepomuk2::ServiceController::slotIsInitializedDBusCallFinished: Service "nepomukstorage" not initialized yet. Listening for signal.
NepomukServer(19918)/nepomuk (server) Nepomuk2::ServiceController::slotServiceInitialized: Failed to initialize service "nepomukstorage"
NepomukServer(19918)/nepomuk (server) Nepomuk2::ServiceController::stop: Stopping "nepomukstorage"
[/home/hrvoje/kdelocal/bin/nepomukservicestub] nepomukstorage(19920)/nepomuk (storage service) Nepomuk2::Core::~Core: Shutting down Nepomuk storage core.
[/home/hrvoje/kdelocal/bin/nepomukservicestub] nepomukstorage(19920)/nepomuk (storage service) Nepomuk2::Repository::~Repository: "main"
[/home/hrvoje/kdelocal/bin/nepomukservicestub] nepomukstorage(19920)/nepomuk (storage service) Nepomuk2::Repository::close: "main"
NepomukServer(19918)/nepomuk (server) Nepomuk2::ServiceController::slotProcessFinished: Service "nepomukstorage" went down
NepomukServer(19918)/nepomuk (server) Nepomuk2::ServiceManager::Private::_k_serviceStopped: Service stopped: "nepomukstorage"
NepomukServer(19918)/nepomuk (server) Nepomuk2::Server::slotServiceStopped: "nepomukstorage"
NepomukServer(19918)/nepomuk (server) Nepomuk2::Server::slotServiceStopped: Services still running: ()
Application '/home/hrvoje/kdelocal/bin/nepomukservicestub nepomukstorage' exited normally...

These are mine settings:

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KDEDIR=~/kdelocal
KDEDIRS=$KDEDIR
PATH=$KDEDIR/bin:$PATH

# Act appropriately if LD_LIBRARY_PATH is not already set.
#if [ -z $LD_LIBRARY_PATH ]; then
#  LD_LIBRARY_PATH=$KDEDIR/lib
#else
  LD_LIBRARY_PATH=$KDEDIR/lib:$LD_LIBRARY_PATH
#fi

export KDEDIRS PATH LD_LIBRARY_PATH

export KDEHOME="${HOME}/.kdelocal"

# Create it if needed
[ ! -e ~/.kdelocal ] && mkdir ~/.kdelocal

CMake output for soprano build:

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# kdesrc-build running: 'cmake' '/home/hrvoje/kdesrc/kdesupport/soprano' '-DCMAKE_BUILD_TYPE=Release' '-DSOPRANO_DISABLE_CLUCENE_INDEX=1' '-DBUILD_VIRTUOSO_BACKEND=ON' '-DCMAKE_CXX_FLAGS:STRING=-pipe ' '-DCMAKE_INSTALL_PREFIX=/home/hrvoje/kdelocal'
# from directory: /home/hrvoje/kdesrc/build/kdesupport/soprano
-- The C compiler identification is GNU 4.7.1
-- The CXX compiler identification is GNU 4.7.1
-- Check for working C compiler: /usr/bin/gcc
-- Check for working C compiler: /usr/bin/gcc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Looking for Q_WS_X11
-- Looking for Q_WS_X11 - found
-- Looking for Q_WS_WIN
-- Looking for Q_WS_WIN - not found.
-- Looking for Q_WS_QWS
-- Looking for Q_WS_QWS - not found.
-- Looking for Q_WS_MAC
-- Looking for Q_WS_MAC - not found.
-- Found Qt-Version 4.8.3
-- Looking for XOpenDisplay in /usr/lib64/libX11.so;/usr/lib64/libXext.so
-- Looking for XOpenDisplay in /usr/lib64/libX11.so;/usr/lib64/libXext.so - found
-- Looking for gethostbyname
-- Looking for gethostbyname - found
-- Looking for connect
-- Looking for connect - found
-- Looking for remove
-- Looking for remove - found
-- Looking for shmat
-- Looking for shmat - found
-- Looking for IceConnectionNumber in ICE
-- Looking for IceConnectionNumber in ICE - found
-- Found X11: /usr/lib64/libX11.so
-- Looking for include file pthread.h
-- Looking for include file pthread.h - found
-- Looking for pthread_create
-- Looking for pthread_create - not found.
-- Looking for pthread_create in pthreads
-- Looking for pthread_create in pthreads - not found
-- Looking for pthread_create in pthread
-- Looking for pthread_create in pthread - found
-- Found Threads: TRUE 
-- Found Rasqal: /usr/lib64/librasqal.so
-- Found Rasqal 0.9.29: libs - /usr/lib64/librasqal.so; includes - /usr/include/rasqal
-- Found PkgConfig: /usr/bin/pkg-config (found version "0.25")
-- Found Raptor: /usr/lib64/libraptor2.so  (found version "2.0.8", required is "2.0.0")
-- Found Redland: /usr/bin/redland-config
-- Could NOT find JNI (missing:  JAVA_AWT_LIBRARY JAVA_JVM_LIBRARY JAVA_INCLUDE_PATH JAVA_INCLUDE_PATH2 JAVA_AWT_INCLUDE_PATH)
-- Could not find Java JNI
-- Found iODBC 3.52.7: libs - /usr/lib64/libiodbc.so; includes - /usr/include
-- Performing Test __SOPRANO_HAVE_GCC_VISIBILITY
-- Performing Test __SOPRANO_HAVE_GCC_VISIBILITY - Success
-- Performing Test __SOPRANO_HAVE_GCC_INLINE_VISIBILITY
-- Performing Test __SOPRANO_HAVE_GCC_INLINE_VISIBILITY - Success
-- Found Doxygen: /usr/bin/doxygen (found version "1.8.1")
---------------------------------------------------------------------------------------
-- Soprano Components that will be built:
   * Redland storage backend
   * Virtuoso storage backend (Run-time dependency: Virtuoso)
   * Raptor RDF parser
     (including TriG parser)
   * Raptor RDF serializer
   * D-Bus server/client support

-- Soprano Components that will NOT be built:
   * Sesame2 storage backend (java-based)
   * The CLucene-based full-text search index library
---------------------------------------------------------------------------------------
-- Configuring done
-- Generating done
-- Build files have been written to: /home/hrvoje/kdesrc/build/kdesupport/soprano

For nepomuk-core:

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# kdesrc-build running: 'cmake' '/home/hrvoje/kdesrc/kde/kdelibs/nepomuk-core' '-DCMAKE_BUILD_TYPE=Release' '-DCMAKE_CXX_FLAGS:STRING=-pipe ' '-DCMAKE_INSTALL_PREFIX=/home/hrvoje/kdelocal'
# from directory: /home/hrvoje/kdesrc/build/kde/kdelibs/nepomuk-core
-- The C compiler identification is GNU 4.7.1
-- The CXX compiler identification is GNU 4.7.1
-- Check for working C compiler: /usr/bin/gcc
-- Check for working C compiler: /usr/bin/gcc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Looking for Q_WS_X11
-- Looking for Q_WS_X11 - found
-- Looking for Q_WS_WIN
-- Looking for Q_WS_WIN - not found.
-- Looking for Q_WS_QWS
-- Looking for Q_WS_QWS - not found.
-- Looking for Q_WS_MAC
-- Looking for Q_WS_MAC - not found.
-- Found Qt-Version 4.8.3 (using /usr/bin/qmake)
-- Looking for XOpenDisplay in /usr/lib64/libX11.so;/usr/lib64/libXext.so;/usr/lib64/libXft.so;/usr/lib64/libXau.so;/usr/lib64/libXdmcp.so;/usr/lib64/libXpm.so
-- Looking for XOpenDisplay in /usr/lib64/libX11.so;/usr/lib64/libXext.so;/usr/lib64/libXft.so;/usr/lib64/libXau.so;/usr/lib64/libXdmcp.so;/usr/lib64/libXpm.so - found
-- Looking for gethostbyname
-- Looking for gethostbyname - found
-- Looking for connect
-- Looking for connect - found
-- Looking for remove
-- Looking for remove - found
-- Looking for shmat
-- Looking for shmat - found
-- Looking for IceConnectionNumber in ICE
-- Looking for IceConnectionNumber in ICE - found
-- Found X11: /usr/lib64/libX11.so
-- Looking for include file pthread.h
-- Looking for include file pthread.h - found
-- Looking for pthread_create
-- Looking for pthread_create - not found.
-- Looking for pthread_create in pthreads
-- Looking for pthread_create in pthreads - not found
-- Looking for pthread_create in pthread
-- Looking for pthread_create in pthread - found
-- Found Threads: TRUE 
-- Looking for _POSIX_TIMERS
-- Looking for _POSIX_TIMERS - found
-- Found Automoc4: /home/hrvoje/kdelocal/bin/automoc4
-- Found Perl: /usr/bin/perl (found version "5.16.0")
-- Found Phonon: /home/hrvoje/kdelocal/include
-- Performing Test _OFFT_IS_64BIT
-- Performing Test _OFFT_IS_64BIT - Success
-- Performing Test HAVE_FPIE_SUPPORT
-- Performing Test HAVE_FPIE_SUPPORT - Success
-- Performing Test __KDE_HAVE_W_OVERLOADED_VIRTUAL
-- Performing Test __KDE_HAVE_W_OVERLOADED_VIRTUAL - Success
-- Performing Test __KDE_HAVE_GCC_VISIBILITY
-- Performing Test __KDE_HAVE_GCC_VISIBILITY - Success
-- Found KDE 4.10 include dir: /home/hrvoje/kdelocal/include
-- Found KDE 4.10 library dir: /home/hrvoje/kdelocal/lib
-- Found the KDE4 kconfig_compiler preprocessor: /home/hrvoje/kdelocal/bin/kconfig_compiler
-- Found automoc4: /home/hrvoje/kdelocal/bin/automoc4
-- Found SharedDesktopOntologies: /home/hrvoje/kdelocal/share/ontology  (found version "0.10.51", required is "0.10")
-- Found Soprano: /home/hrvoje/kdelocal/include  (found version "2.8.50", required is "2.7.56")
-- Found Strigi: /home/hrvoje/kdelocal/lib/libstreams.so
-- Found Doxygen: /usr/bin/doxygen (found version "1.8.1")
-- Performing Test STRIGI_HAS_VERSION_HEADER
-- Performing Test STRIGI_HAS_VERSION_HEADER - Failed
-- Performing Test STRIGI_HAS_FILEINPUTSTREAM_OPEN
-- Performing Test STRIGI_HAS_FILEINPUTSTREAM_OPEN - Success

-----------------------------------------------------------------------------
-- The following external packages were located on your system.
-- This installation will have the extra features provided by these packages.
-----------------------------------------------------------------------------
   * Soprano - Soprano is the Qt-based RDF storage and parsing solution
   * Soprano Virtuoso Backend - Virtuoso storage backend for Soprano
   * Soprano Raptor Parser - RDF parser plugin for Soprano
   * Soprano Redland Backend - Redland storage backend for Soprano
   * Shared desktop ontologies - Desktop ontologies
   * Strigi - Strigi is a fast and light-weight file indexing solution

-----------------------------------------------------------------------------
-- Congratulations! All external packages have been found.
-----------------------------------------------------------------------------

-- Configuring done
-- Generating done
-- Build files have been written to: /home/hrvoje/kdesrc/build/kde/kdelibs/nepomuk-core

Any idea what could be wrong?

I 'almost solved' my issue, by compiling virtuoso into same prefix as KDE built with kdesrc-build.
Why almost? Cause now i got nepomuk up & running, but on every KDE start, there are two virtuoso processes

That shouldn't be, right?

You should only get one Virtuoso instance - unless you end up with two nepomukserver instances somehow.
In regards to this issue - are you running on 64 bit? If you are, you may need to pass the -DLIB_SUFFIX=64 option to cmake (see the cmake-options part of your kdesrc-buildrc file if you use kdesrc-build) in order for Soprano/Nepomuk to find the Virtuoso connector (as it uses iODBC to connect).

compiled virtuoso to same prefix as KDE, with configure flags same as suse's and the issue is gone

Marked as Solved - good to hear.