Cross compilation error with QtCreator [Yocto Image] in Ubuntu 14

Qt Creator is giving this library error:

11:13:12: Running steps for project qtConsoleTest...11:13:12: Starting: "/usr/bin/make" cleanrm -f main.orm -f *~ core *.core11:13:12: The process "/usr/bin/make" exited normally.11:13:12: Configuration unchanged, skipping qmake step.11:13:12: Starting: "/usr/bin/make"g++ -c -pipe -g -std=gnu++0x -Wall -W -D_REENTRANT -fPIC -DQT_QML_DEBUG -DQT_CORE_LIB -I../qtConsoleTest -I. -isystem /opt/fsl-imx-x11/4.1.15-2.0.1/sysroots/cortexa7hf-neon-poky-linux-gnueabi/usr/include/qt5 -isystem /opt/fsl-imx-x11/4.1.15-2.0.1/sysroots/cortexa7hf-neon-poky-linux-gnueabi/usr/include/qt5/QtCore -I. -I/opt/fsl-imx-x11/4.1.15-2.0.1/sysroots/cortexa7hf-neon-poky-linux-gnueabi/usr/lib/qt5/mkspecs/linux-g++ -o main.o ../qtConsoleTest/main.cppg++  -o qtConsoleTest main.o   -lQt5Core -lpthread /usr/bin/ld: cannot find -lQt5Corecollect2: error: ld returned 1 exit statusmake: *** [qtConsoleTest] Error 111:13:13: The process "/usr/bin/make" exited with code 2.Error while building/deploying project qtConsoleTest (kit: ce3TunnelBoard)When executing step "Make"11:13:13: Elapsed time: 00:01.

Based on this Question, I think my problem is that QMAKE_SPEC and QMAKE_XSPEC under Qt Versions should be showing linux-oe-g++ (instead of linux-g++) but I don't know how to change that. Have I missed any steps?

I've bitbaked Qt5 SDK, I've also sourced the environment in "/opt/Qt5.8.0/Tools/QtCreator/bin/qtcreator.sh" by adding this at the top:

source /opt/fsl-imx-x11/4.1.15-2.0.1/environment-setup-cortexa7hf-neon-poky-linux-gnueabi

and configured the following options under Debuggers, Compilers & Qt Versions respectively:

/opt/fsl-imx-x11/4.1.15-2.0.1/sysroots/x86_64-pokysdk-linux/usr/bin/arm-poky-linux-gnueabi/arm-poky-linux-gnueabi-gdb/opt/fsl-imx-x11/4.1.15-2.0.1/sysroots/x86_64-pokysdk-linux/usr/bin/arm-poky-linux-gnueabi/arm-poky-linux-gnueabi-g++/opt/fsl-imx-x11/4.1.15-2.0.1/sysroots/x86_64-pokysdk-linux/usr/bin/qt5/qmake

These are the screenshots just in case.

any help.