[yocto] why alsa cannot be supported by libsdl

[ZHANG Qianjun]

Hi
   I noticed that patch in ..\meta\recipes-graphics\libsdl\libsdl-1.2.15\ configure_tweak.patch
It seems make option of "enable-alsa" unavailable.
   Do anyone know why and what can I do if I want to use ALSA in libSDL?

Thanks
Best Regards

Qianjun

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