pkg-config --cflags opencv: No such file or directory

Question

I'm writing a basic example of opencv, but make command give me message

g++-4.7.real: error: pkg-config --cflags opencv: No such file or directory

g++-4.7.real: error: pkg-config --libs opencv: No such file or directory

issue command pkg-config --cflag opencv give me result as:

-I/usr/local/include/opencv -I/usr/local/include

and pkg-config --libs opencv give me:

-I/usr/local/include/opencv -I/usr/local/include
vudao@vudaopc:~/work/nmath/ntrainer$ pkg-config --libs opencv /usr/local/lib/libopencv_contrib.a /usr/local/lib/libopencv_stitching.a /usr/local/lib/libopencv_nonfree.a /usr/local/lib/libopencv_superres.a /usr/local/lib/libopencv_ocl.a /usr/local/lib/libopencv_ts.a /usr/local/lib/libopencv_videostab.a /usr/local/lib/libopencv_gpu.a /usr/local/lib/libopencv_photo.a /usr/local/lib/libopencv_objdetect.a /usr/local/lib/libopencv_legacy.a /usr/local/lib/libopencv_video.a /usr/local/lib/libopencv_ml.a /usr/local/lib/libopencv_calib3d.a /usr/local/lib/libopencv_features2d.a /usr/local/lib/libopencv_highgui.a /usr/local/share/OpenCV/3rdparty/lib/libIlmImf.a /usr/local/share/OpenCV/3rdparty/lib/liblibjasper.a /usr/local/share/OpenCV/3rdparty/lib/liblibtiff.a /usr/local/lib/libopencv_imgproc.a /usr/local/lib/libopencv_flann.a /usr/local/lib/libopencv_core.a /usr/lib/i386-linux-gnu/libbz2.so /usr/lib/i386-linux-gnu/libpng.so /usr/lib/i386-linux-gnu/libjpeg.so /usr/lib/i386-linux-gnu/libz.so -lswscale -lavformat -lavutil -lz -lSDL -lasound -lavcodec -lgthread-2.0 -lglib-2.0 -lgobject-2.0 -lfontconfig -lfreetype -lpango-1.0 -lcairo -lgdk_pixbuf-2.0 -lpangocairo-1.0 -lpangoft2-1.0 -lgio-2.0 -latk-1.0 -lgdk-x11-2.0 -lgtk-x11-2.0 -lrt -lpthread -lm -ldl -lstdc++

Below is my Makefile:

CC=g++
CFLAGS=-O2 -g 'pkg-config --cflags opencv'
LDFLAGS='pkg-config --libs opencv'

BIN=ntrainer

ntrainer : ntrainer.cpp
    $(CC) $(CFLAGS) $(LDFLAGS) -o $(BIN) ntrainer.cpp

My system is Ubuntu 12.10. I have installed opencv-2.4.7 successfully (I think) following instructions here http://www.samontab.com/web/2011/06/installing-opencv-2-2-in-ubuntu-11-04/

I also have configured and exported PKG_CONFIG_PATH into /etc/bash.bashrc, I'v also ran ldconfig

Please someone tell me what I'm missing? And how to correct it. Thanks too much.

Answer 1

You used incorrect quotes. You should use ` instead of ':

CC=g++
CFLAGS=-O2 -g `pkg-config --cflags opencv`
LDFLAGS=`pkg-config --libs opencv`