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I guess you need to change

target_link_libraries(hello ${catkin_LIBRARIES})

for

target_link_libraries(hello ${catkin_LIBRARIES} roboteq_motor )

.

Note that:

catkin_package(
 INCLUDE_DIRS include/${PROJECT_NAME}/
  LIBRARIES roboteq_motor
  CATKIN_DEPENDS roscpp std_msgs
  DEPENDS system_lib
)

makes packages that depend on this package implicitly linking their executables / libs against the roboteq_motor library but for the execs/libs in this you still need to add the lib to target_link_libraries