+ printf ' :darwin' >> $ltf
+ if [ $sbcl_arch = "x86" ]; then
+ printf ' :mach-exception-handler :sb-lutex :restore-fs-segment-register-from-tls' >> $ltf
+ fi
+ if [ $sbcl_arch = "x86-64" ]; then
+ printf ' :mach-exception-handler :sb-lutex' >> $ltf
+ fi