pkg_setup() { if use bindist; then die "This package can't be redistributable due to SILK license." fi } That's not an appropriate usage of a flag. Please remove pkg_setup (and the flag from IUSE), and add "bindist" to RESTRICT instead.
In tree. Though package and friends (linphone, mediastreamer*) are broken in many ways right now. It's on my list to update and fix them, but currently I'm busy with other packages.