diff --git a/sys/unix/hints/include/compiler.370 b/sys/unix/hints/include/compiler.370
index 1a0c3b990..10e7d2a27 100755
--- a/sys/unix/hints/include/compiler.370
+++ b/sys/unix/hints/include/compiler.370
@@ -149,6 +149,7 @@ CCXX=clang++ -std=c++11
 CLANGPPGTEQ9 := $(shell expr `$(CXX) -dumpversion | cut -f1 -d.` \>= 9)
 CLANGPPGTEQ11 := $(shell expr `$(CXX) -dumpversion | cut -f1 -d.` \>= 11)
 CLANGPPGTEQ14 := $(shell expr `$(CXX) -dumpversion | cut -f1 -d.` \>= 14)
+CLANGPPGTEQ16 := $(shell expr `$(CXX) -dumpversion | cut -f1 -d.` \>= 16)
 CLANGPPGTEQ17 := $(shell expr `$(CXX) -dumpversion | cut -f1 -d.` \>= 17)
 ifeq "$(CLANGPPGTEQ9)" "1"
 #CCXXFLAGS+=-Wformat-overflow
diff --git a/sys/unix/hints/macOS.370 b/sys/unix/hints/macOS.370
index b77ea94f1..7f2c57079 100755
--- a/sys/unix/hints/macOS.370
+++ b/sys/unix/hints/macOS.370
@@ -87,6 +87,13 @@ endif   # HAVE_MACPORTS
 endif   # QTDIR
 endif   # WANT_WIN_QT
 
+ifdef WANT_WIN_QT
+ifeq "$(CLANGPPGTEQ16)" "1"
+CXX=clang++ --std=c++20
+CCXXFLAGS +=-Wno-c++20-attribute-extensions
+endif
+endif
+
 # misc.370 must come after compiler.370
 # and after QTDIR is defined