diff --git a/share/mk/bsd.sys.mk b/share/mk/bsd.sys.mk
index 2134886abcf5..50eb04b9fd15 100644
--- a/share/mk/bsd.sys.mk
+++ b/share/mk/bsd.sys.mk
@@ -93,6 +93,11 @@ CWARNFLAGS.clang+=	-Wno-error=unused-but-set-parameter
 # Similar to gcc >= 8.1 -Wno-error=cast-function-type below
 CWARNFLAGS.clang+=	-Wno-error=cast-function-type-mismatch
 .endif
+.if ${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 210000
+CXXWARNFLAGS.clang+=	-Wno-c++20-extensions
+CXXWARNFLAGS.clang+=	-Wno-c++23-lambda-attributes
+CXXWARNFLAGS.clang+=	-Wno-nullability-completeness
+.endif
 .endif # WARNS <= 6
 .if ${WARNS} <= 3
 CWARNFLAGS.clang+=	-Wno-tautological-compare -Wno-unused-value\