Description:
When using cmake to include OpenCV in a project, the cmake command "find_package( OpenCV )" fails with:
"CMake Error at /usr/share/opencv/OpenCVModules.cmake:117 (message):
The imported target "opencv_ts" references the file
"/usr/lib/libopencv_ts.a"
but this file does not exist. (...)"

Additional info:
* package version(s): opencv 2.4.7-1

Steps to reproduce:
Create a cmake file CMakeLists.txt with content:

# CMakeLists.txt content BEGIN
project( test )
cmake_minimum_required(VERSION 2.8)
find_package(OpenCV)
# CMakeLists.txt content END

and perform this command in the folder of the created CMakeLists.txt:
mkdir build && cd build && cmake ..