diff -up luxrays-6907bd2846bf/samples/smallluxgpu/CMakeLists.txt.ld luxrays-6907bd2846bf/samples/smallluxgpu/CMakeLists.txt
--- luxrays-6907bd2846bf/samples/smallluxgpu/CMakeLists.txt.ld	2012-10-02 20:48:49.000000000 +0200
+++ luxrays-6907bd2846bf/samples/smallluxgpu/CMakeLists.txt	2012-10-04 00:26:04.072900252 +0200
@@ -176,6 +176,7 @@ add_executable(slg ${SMALLLUXGPU_SRCS})
 TARGET_LINK_LIBRARIES(slg luxrays ${GLEW_LIBRARY} ${OPENGL_LIBRARY})
 TARGET_LINK_LIBRARIES(slg ${OpenCL_LIBRARY})
 TARGET_LINK_LIBRARIES(slg ${GLUT_LIBRARY})
+TARGET_LINK_LIBRARIES(slg -lpthread)
 
 # This instructs FREEGLUT to emit a pragma for the static version
 SET_TARGET_PROPERTIES(slg PROPERTIES COMPILE_DEFINITIONS FREEGLUT_STATIC)