Added flag for cmake 3

Author: Nesterov Alexander

CMakeLists.txt

@@ -21,6 +21,8 @@ if( USE_OMP )
         set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${OpenMP_C_FLAGS}")
         set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OpenMP_CXX_FLAGS}")
         set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${OpenMP_EXE_LINKER_FLAGS}")
+    else( OpenMP_FOUND )
+        set( USE_OMP OFF )
     endif( OpenMP_FOUND )
 endif( USE_OMP )