title: How to check the libjpeg-turbo is built into opencv?
body: <p>I download the opencv3.4.5 from github <a href="https://github.com/opencv/opencv/archive/3.4.5.zip" rel="nofollow noreferrer">https://github.com/opencv/opencv/archive/3.4.5.zip</a>. And the libjpeg-turbo is located at 3rdparty dir.
  And build it with <code>-D WITH_JPEG=ON</code> and <code>-D BUILD_JPEG=ON</code> added. I can check this in CMakeCache.txt. But i cannot find any thing related with <code>libjpeg-turbo</code> at install/include or install/lib. How to test and verify the libjpeg-turbo is built into opencv? Instead of system libjpeg.</p>