adding gcc command line options in QT

[prkhr4u]

How can and where should I add gcc command line options in QtCreator?
example:

I want to run a program in QT which otherwise runs like this in terminal:

gcc basic-tutorial-1.c -o basic-tutorial-1 `pkg-config --cflags --libs gstreamer-0.10`

gcc basic-tutorial-1.c -o basic-tutorial-1 `pkg-config --cflags --libs gstreamer-0.10`

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Where should I add the string `pkg-config --cflags --libs gstreamer-0.10` ??