+AC_ARG_ENABLE(warnings,
+[ --enable-warnings turn on compiler warnings], ENABLE_WARNINGS=true)
+AC_ARG_ENABLE(optimizations,
+[ --enable-optimizations turn on compiler optimizations (recommended for avi2swf)], OPTIMIZE=true)
+AC_ARG_ENABLE(lame,
+[ --disable-lame don't compile any L.A.M.E. mp3 encoding code in], DISABLE_LAME=true)