diff -ur vst3sdk-3.7.4_build_25.orig/pluginterfaces/base/funknown.cpp vst3sdk-3.7.4_build_25/pluginterfaces/base/funknown.cpp
--- vst3sdk-3.7.4_build_25.orig/pluginterfaces/base/funknown.cpp	2022-01-18 10:42:29.305860504 +1000
+++ vst3sdk-3.7.4_build_25/pluginterfaces/base/funknown.cpp	2022-05-17 10:22:42.306950103 +1000
@@ -88,7 +88,7 @@
 int32 PLUGIN_API atomicAdd (int32& var, int32 d)
 {
 #if SMTG_USE_STDATOMIC_H
-	return atomic_fetch_add (reinterpret_cast<atomic_int_least32_t*> (&var), d) + d;
+	return std::atomic_fetch_add (reinterpret_cast<std::atomic_int_least32_t*> (&var), d) + d;
 #else
 #if SMTG_OS_WINDOWS
 #ifdef __MINGW32__
diff -ur vst3sdk-3.7.4_build_25.orig/pluginterfaces/base/funknown.h vst3sdk-3.7.4_build_25/pluginterfaces/base/funknown.h
--- vst3sdk-3.7.4_build_25.orig/pluginterfaces/base/funknown.h	2022-01-18 10:42:29.305860504 +1000
+++ vst3sdk-3.7.4_build_25/pluginterfaces/base/funknown.h	2022-05-17 10:22:52.071191240 +1000
@@ -20,6 +20,7 @@
 #include "pluginterfaces/base/ftypes.h"
 #include "pluginterfaces/base/smartpointer.h"
 #include <cstring>
+#include <atomic>
 
 #if SMTG_CPP11_STDLIBSUPPORT
 #include <type_traits>