+ Some features of interest:
+
+ :SB-THREAD
+ Native threads. Enabled by default on x86[-64] Linux only, also
+ available on x86[-64] Max OS X, x86[-64] FreeBSD, and x86
+ Solaris.
+
+ :SB-UNICODE
+ Unicode support. Enabled by default. Disabling this feature
+ limits characters to the 8-bit ISO-8859-1 set.
+
+ :SB-XREF-FOR-INTERNALS
+ XREF data for SBCL internals. Not enabled by default, increases
+ core size by 5-6mb.
+