 <pre><code>QMAKE_CXXFLAGS += -std=c++0x </code></pre> <p>Results in an error because you're not using the MinGW compiler. "D9002: Ignoring unknown option <code>-std=c++0x</code>" is an error from the MSVC compiler.</p> <p>In QtCreator, go to the projects tab(on the left) and change the toolchain you're using. If it hasn't auto-detected MinGW, you're going to have to add it yourself by clicking on the manage button.</p>