title: Access denied when building a project
body: <p>I’m working on a project with opencv lib. I use Qt 4.8 on Windows 7 and it gives me an error when building the project:</p>
  
  <pre><code> mingw32-make.exe[1]: *** Access is denied.
   . Stop.
   mingw32-make.exe: *** [release] Error 2
   19:05:06: The process "F:\QtSDK\mingw\bin\mingw32-make.exe" exited with code 2.
   Error while building project TraySystemtry (target: Desktop)
   When executing build step 'Make'
  </code></pre>
  
  <p>The pro file:</p>
  
  <pre><code>    QT += xml svg core gui
  
  CONFIG += qt
  
  VERSION = 0.3.0
  
  TEMPLATE = app
  
  INCLUDEPATH += D:\OpenCV\opencv\build\include
  
  LIBS += -LD:\OpenCV\opencv_Build\bin\
      -lopencv_core242 \
      -lopencv_highgui242 \
      -lopencv_imgproc242 \
      -lopencv_features2d242 \
      -lopencv_calib3d242 \
      -lopencv_objdetect242
  
  HEADERS += \
      window.h \
      aboutus.h \
      abouttab.h \
      developertab.h \
      privacytab.h \
      classificationhand.h \
      keyssetup.h
  
  SOURCES += \
      window.cpp \
      main.cpp \
      aboutus.cpp \
      abouttab.cpp \
      developertab.cpp \
      privacytab.cpp \
      classificationhand.cpp \
      keyssetup.cpp
  
  RESOURCES += \
      systray.qrc
  </code></pre>
  
  <p>I can’t figure out the problem.</p>