===> LD ja2
/usr/bin/ld: skipping incompatible /usr/lib/libSDL.so when searching for -lSDL
/usr/bin/ld: skipping incompatible /usr/lib/libSDL.a when searching for -lSDL
/usr/bin/ld: skipping incompatible /usr/bin/../lib/libSDL.so when searching for -lSDL
/usr/bin/ld: skipping incompatible /usr/bin/../lib/libSDL.a when searching for -lSDL
/usr/bin/ld: skipping incompatible /usr/lib/libSDL.so when searching for -lSDL
/usr/bin/ld: skipping incompatible /usr/lib/libSDL.a when searching for -lSDL
/usr/bin/ld: cannot find -lSDL
collect2: ld gab 1 als Ende-Status zurück
make: *** [ja2] Fehler 1