Linking libraries to a QT project using pkg-config output

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This is a bit of a newbie question. I am trying to add the OpenCV libraries to a QT project.

This question says the link flags are given by

pkg-config --libs opencv

If I paste the command line output into the project file like:

LIBS += -L/usr/local/lib -lml -lcvaux -lhighgui -lcv -lcxcore

then everything compiles fine, but now this isn't portable. How can I simply reference the output of the command?

Update: Tried Ken Bloom's suggestion, but it won't compile. The actual generated compiler commands are

# How it should be, at least on my machine
g++ -o QOpenCVTest main.o qopencvtest.o moc_qopencvtest.o -L/usr/lib -L/usr/local/lib -lml -lcvaux -lhighgui -lcv -lcxcore -lQtGui -lQtCore -lpthread

# with CONFIG and PKGCONFIG
g++ -o QOpenCVTest main.o qopencvtest.o moc_qopencvtest.o -L/usr/lib -lQtGui -lQtCore -lpthread
qmake qt c++
5 Answers

In the newer version of Qt, this needs to be done to avoid a package not found error:

QT_CONFIG -= no-pkg-config
CONFIG += link_pkgconfig
PKGCONFIG += protobuf #or whatever package here

Also had to do this for Mac:

mac {
  PKG_CONFIG = /usr/local/bin/pkg-config
}
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