【前言】
我們都知道在Linux系統下配置完opencv環境後，Qt直接按照以下方式就可以直接調用了！這裏我們採用的編譯器是mingw32-make！
CONFIG
+=
link_pkgconfig
PKGCONFIG
+=
opencv
但在windows下面，要麼在VS下配置include和lib目錄，針對Qt Creator下的多數採用下面的方案：
INCLUDEPATH
+=
D:\opencv\build\include
LIBS
+=
D:\opencv-build\bin\libopencv_core320.dll
LIBS
+=
D:\opencv-build\bin\libopencv_highgui320.dll
LIBS
+=
D:\opencv-build\bin\libopencv_imgcodecs320.dll
LIBS
+=
D:\opencv-build\bin\libopencv_imgproc320.dll
LIBS
+=
D:\opencv-build\bin\libopencv_features2d320.dll
LIBS
+=
D:\opencv-build\bin\libopencv_calib3d320.dll
如果只使用opencv或許沒啥問題，但是往往我們還需要其它第三方的c++庫，這時採用這樣的方式，工程管理上比較混亂！隨無傷大雅，但總覺得彆扭！
針對這樣的情況，我們往往採用兩種方案，分別爲Cmake和pkg-config這兩種！CMake的確很優秀，但不自動管理Qt自己的內部庫，相當於Qt庫和第三方庫一視同仁，都需要自己配置，這就尷尬了！一般比較複雜且需要跨平臺部署的工程才建議使用cmake，平時也沒必要自己折騰自己了！
於是下面討論是pkg-config的方案！
On http://sourceforge.net/p/mingw/mailman/message/31908633/ there
are some instructions from earlier this year:
The FAQ pkg-config information did not work for me: these did:https://github.com/texane/stlink/issues/169Download these three glib, pkg-config, pkg-config-dev archives and extract contents to C:\MinGW
I keep this unaccepted in case someone has a better answer.
最新的pkg-config是0.29的版本，這裏是0.28的！pkg-config這個工具比較穩定了，更新頻次比較少！0.28與0.29的區別不大，使用是沒有問題的！
下載上面的三個工具，分別爲glib,pkg-config,pkg-config-dev。將其放置到mingw的安裝目錄中！這裏我使用的是Qt自帶的mingw，你可以完全像我這樣設置！
將其分別解壓，目錄結構分別爲
將他們目錄下文件夾分別拷貝到mingw的安裝目錄！
在lib目錄下創建一個pkgconfig，用於放置opencv.pc文檔！
我們最好再設置一下PKG_CONFIG_PATH
現在我們需要找到opencv.pc，將其複製過來並編輯配置一下！
將其拷貝到剛纔的PKG_CONFIG_PATH所對應的目錄下！
需要注意的是這個opencv.pc文檔在widnows下需要修改一下，否則不好使用！
原本的opencv.pc的內容如下
# Package Information for pkg-config
prefix=D:/OpenCV/build/install
exec_prefix=${prefix}
libdir=${exec_prefix}/x86/mingw/lib
includedir_old=${prefix}/include/opencv
includedir_new=${prefix}/include
Name: OpenCV
Description: Open Source Computer Vision Library
Version: 3.3.1
Libs: -L${exec_prefix}/x86/mingw/lib -llibopencv_dnn331d.dll -llibopencv_ml331d.dll -llibopencv_objdetect331d.dll -llibopencv_shape331d.dll -llibopencv_stitching331d.dll -llibopencv_superres331d.dll -llibopencv_videostab331d.dll
-llibopencv_calib3d331d.dll -llibopencv_features2d331d.dll -llibopencv_highgui331d.dll -llibopencv_videoio331d.dll -llibopencv_imgcodecs331d.dll -llibopencv_video331d.dll -llibopencv_photo331d.dll -llibopencv_imgproc331d.dll -llibopencv_flann331d.dll -llibopencv_core331d.dll
Libs.private: -lopengl32 -lglu32
Cflags: -I${includedir_old} -I${includedir_new}
這裏我們可以看到上面有prefix，exec_prefix這樣的變量，在windows下的pkg-config是無視他們的，都是默認到mingw的安裝目錄，因此我們需要改爲絕對路徑！這裏設定你自己的目錄就可以了！
# Package Information for pkg-config
libdir=D:/OpenCV/build/install/x86/mingw/lib
includedir_old=D:/OpenCV/build/install/include/opencv
includedir_new=D:/OpenCV/build/install/include
Name: OpenCV
Description: Open Source Computer Vision Library
Version: 3.3.1
Libs: -LD:/OpenCV/build/install/x86/mingw/lib -llibopencv_dnn331d.dll -llibopencv_ml331d.dll -llibopencv_objdetect331d.dll -llibopencv_shape331d.dll -llibopencv_stitching331d.dll -llibopencv_superres331d.dll
-llibopencv_videostab331d.dll -llibopencv_calib3d331d.dll -llibopencv_features2d331d.dll -llibopencv_highgui331d.dll -llibopencv_videoio331d.dll -llibopencv_imgcodecs331d.dll -llibopencv_video331d.dll -llibopencv_photo331d.dll -llibopencv_imgproc331d.dll -llibopencv_flann331d.dll
-llibopencv_core331d.dll
Libs.private: -lopengl32 -lglu32
Cflags: -I${includedir_old} -I${includedir_new}
好了，pkg-config環境配置都完成了！
pro工程目錄下添加
CONFIG
+=
link_pkgconfig
PKGCONFIG
+=
opencv
就可以構建使用了！
這樣我們就可以擁抱qmake了，無需需要cmake就可以開開心心的添加第三方庫了！