求助：makefile错误 ： commands commence before first target. Stop

代码:

lutao@lutao-laptop:~/NVIDIA_GPU_Computing_SDK/C/src/smokeParticles$ make
In file included from GpuArray.h:19,
                 from ParticleSystem.h:18,
                 from particleDemo.cpp:45:
/usr/local/cuda/include/cuda_runtime.h:145: warning: unused parameter ‘flags’
In file included from GpuArray.h:19,
                 from ParticleSystem.h:18,
                 from ParticleSystem.cpp:29:
/usr/local/cuda/include/cuda_runtime.h:145: warning: unused parameter ‘flags’
/usr/bin/ld: cannot find -lGLU
collect2: ld returned 1 exit status
make: *** [../../bin/linux/release/smokeParticles] 错误 1