Cmake project to Qt qmake project, problem with -msse3

[visoda]

I'm very new to Qt and Linux, but hopefully you could help to find a solution for the following problem.
I have a couple of complex Qt projects which are working fine. But now I want to use a CMake project (library for visual odometry) together with my other Qt projects (camera frame grabber, projects based on OpenCV...).

Therefore I used the following command to import all header and source files from the cmake project.
@qmake -project@

Then my .pro file looks like this:

@TEMPLATE = app
#DEPENDPATH += .
#INCLUDEPATH += .

added by me

QT += core

QT -= gui

TARGET = libvisoT
CONFIG += console
CONFIG -= app_bundle

Input

HEADERS += filter.h
matcher.h
matrix.h
reconstruction.h
timer.h
triangle.h
viso.h
viso_mono.h
viso_stereo.h
SOURCES += filter.cpp
main.cpp
matcher.cpp
matrix.cpp
reconstruction.cpp
triangle.cpp
viso.cpp
viso_mono.cpp
viso_stereo.cpp@

When I Run the project I got lots of errors, like:
/usr/lib/gcc/i686-linux-gnu/4.6/include/emmintrin.h:32: error: #error "SSE2 instruction set not enabled"
or
/usr/lib/gcc/i686-linux-gnu/4.6/include/pmmintrin.h:32: error: #error "SSE3 instruction set not enabled"

This is the place where the error occures in the emmintrin.h file:
@#ifndef SSE2

error "SSE2 instruction set not enabled"

#else@

I think thats because I haven't set the msse3 instruction, like it is done with the following code in the CMakeLists.txt file:
@# use sse3 instruction set
SET(CMAKE_CXX_FLAGS "-msse3")@

The whole CMakeLists.txt file:
@# project
cmake_minimum_required (VERSION 2.6)
project (libviso2)

directories

set (LIBVISO2_SRC_DIR src)

include directory

include_directories("${LIBVISO2_SRC_DIR}")

use sse3 instruction set

SET(CMAKE_CXX_FLAGS "-msse3")

sources

FILE(GLOB LIBVISO2_SRC_FILES "src/*.cpp")

make release version

set(CMAKE_BUILD_TYPE Release)

demo program

add_executable(viso2 ${LIBVISO2_SRC_FILES})
target_link_libraries (viso2 png)@

How can I give or set in Qt the following msse3 information from CMake?
@SET(CMAKE_CXX_FLAGS "-msse3")@

Or how can I make a Qt project out of this CMake project?
Many thanks for any help!!!

[pkj__]

bq. How can I give or set in Qt the following msse3 information from CMake?

QMAKE_CXXFLAGS += -msse3

[visoda]

Many Thanks!!! It worked!