Cross-compiling for Windows under Linux. Does not work yet.
Cross-compiling for Windows under Linux. Does not work yet.

`cmake ..` fails on my computer with the following message:

-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
CMake Error at /usr/share/cmake-3.0/Modules/FindPackageHandleStandardArgs.cmake:136 (message):
  Could NOT find OpenGL (missing: OPENGL_gl_LIBRARY)
Call Stack (most recent call first):
  /usr/share/cmake-3.0/Modules/FindPackageHandleStandardArgs.cmake:343 (_FPHSA_FAILURE_MESSAGE)
  /usr/share/cmake-3.0/Modules/FindOpenGL.cmake:175 (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
  CMakeLists.txt:38 (find_package)

-- Configuring incomplete, errors occurred!

	modified:   CMakeLists.txt

nrz/ylikuutio,nrz/ylikuutio,nrz/ylikuutio,nrz/ylikuutio