Try this one (everything in one line):
for pack in $(find /var/db/pkg/ -type f -name IUSE -exec grep -l 'alsa' '{}' ';' |sed 's#IUSE$#USE#'); do grep -l '\-alsa' $pack; done |sed 's#.*pkg/\(.*\)-[0-9].*/USE#\1#'
Ding ding ding! Congrats, you got it!
Dong dong dong.. looks like a bindump of a jpeg image :)
I wonder how many years pass by until I construct such commands for myself..
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