>	return 0

nowhere do you check the return value of xmms2_flag, so not much point in 
returning a value (also, the eerror path no longer returns 1)

>			${CHOST:+--with-target-platform=${CHOST}} \

CHOST is guaranteed to always be set, so no need for the ${VAR:+} magic

>		for option in "${option_map[@]}"; do
>		for plugin in "${plugin_map[@]}"; do

you didnt declare option/plugin local anywhere that i can see
-mike