+ #
+ # Optional features -- We enable them by default, but the build
+ # ought to work perfectly without them:
+ #
+ printf ' :sb-futex' >> $ltf
+ printf ' :sb-qshow' >> $ltf
+ #
+ # Required features -- Some of these used to be optional, but
+ # building without them is no longer considered supported:
+ #
+ # (Of course it doesn't provide dlopen, but there is
+ # roughly-equivalent magic nevertheless:)
+ printf ' :sb-dynamic-core :os-provides-dlopen' >> $ltf
+ printf ' :sb-thread :sb-safepoint :sb-thruption :sb-wtimer' >> $ltf
+ printf ' :sb-safepoint-strictly' >> $ltf
+ #