fails to open mixer, saying:

$ perl rock.band.kit.pl /dev/input/event1
Use of inherited AUTOLOAD for non-method SDL::MixOpenAudio() is deprec
+ated at rock.band.kit.pl line 47.
Can't locate auto/SDL/MixOpenAudi.al in @INC (@INC contains: /etc/perl
+ /usr/local/lib/perl/5.10.0 /usr/local/share/perl/5.10.0 /usr/lib/per
+l5 /usr/share/perl5 /usr/lib/perl/5.10 /usr/share/perl/5.10 /usr/loca
+l/lib/site_perl .) at rock.band.kit.pl line 47
[download]

there are results on google for this error message, but it looks like nobody really answered why this error exists or how to fix it. can YOU? (that's a challenge.)