The "make" error of smpeg 0.4.4

Hello all
I have installed the package of SDL 1.2 on my fedora core 6 ,
and then I download the SMPEG of 0.4.4
when I type ./configure and then type make in the directory
it showes
MPEGaudio.cpp: In member function ‘bool MPEGaudio::WantedSpec
(SDL_AudioSpec*)’:
MPEGaudio.cpp:107: error: ‘Play_MPEGaudioSDL’ was not declared in this scope
MPEGaudio.cpp: In member function ‘void MPEGaudio::StartDecoding()’:
MPEGaudio.cpp:156: error: ‘Decode_MPEGaudio’ was not declared in this scope

how can I solve this problem ? thanks!–
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