Index: head/share/mk/bsd.sys.mk
===================================================================
--- head/share/mk/bsd.sys.mk
+++ head/share/mk/bsd.sys.mk
@@ -150,7 +150,8 @@
 
 # GCC 6.1.0
 .if ${COMPILER_VERSION} >= 60100
-CWARNFLAGS+=	-Wno-error=nonnull-compare		\
+CWARNFLAGS+=	-Wno-error=maybe-uninitialized		\
+		-Wno-error=nonnull-compare		\
 		-Wno-error=shift-negative-value		\
 		-Wno-error=tautological-compare		\
 		-Wno-error=unused-const-variable