Index: share/mk/src.opts.mk
===================================================================
--- share/mk/src.opts.mk
+++ share/mk/src.opts.mk
@@ -180,7 +180,6 @@
     DTRACE_TESTS \
     EISA \
     HESIOD \
-    LLDB \
     NAND \
     OFED \
     OPENLDAP \
@@ -238,6 +237,12 @@
 .if ${__T} == "arm" || ${__T} == "armeb"
 BROKEN_OPTIONS+=LLDB
 .endif
+# LLDB is functional on only some platforms.
+.if ${__T} == "aarch64" || ${__T} == "amd64"
+__DEFAULT_YES_OPTIONS+=LLDB
+.else
+__DEFAULT_NO_OPTIONS+=LLDB
+.endif
 
 .include <bsd.mkopt.mk>