desubmodulize portaudio - PLEASE READ

this is necessary in order to get Furnace to build using CMake 4.0.

you should do:

git submodule deinit extern/portaudio

extern/portaudio-modified/bindings/cpp/include/portaudiocpp/AutoSystem.hxx

@@ -0,0 +1,62 @@
+#ifndef INCLUDED_PORTAUDIO_AUTOSYSTEM_HXX
+#define INCLUDED_PORTAUDIO_AUTOSYSTEM_HXX
+
+// ---------------------------------------------------------------------------------------
+
+#include "portaudiocpp/System.hxx"
+
+// ---------------------------------------------------------------------------------------
+
+namespace portaudio
+{
+
+
+    //////
+    /// @brief A RAII idiom class to ensure automatic clean-up when an exception is
+    /// raised.
+    ///
+    /// A simple helper class which uses the 'Resource Acquisition is Initialization'
+    /// idiom (RAII). Use this class to initialize/terminate the System rather than
+    /// using System directly. AutoSystem must be created on stack and must be valid
+    /// throughout the time you wish to use PortAudioCpp. Your 'main' function might be
+    /// a good place for it.
+    ///
+    /// To avoid having to type portaudio::System::instance().xyz() all the time, it's usually
+    /// a good idea to make a reference to the System which can be accessed directly.
+    /// @verbatim
+    /// portaudio::AutoSys autoSys;
+    /// portaudio::System &sys = portaudio::System::instance();
+    /// @endverbatim
+    //////
+    class AutoSystem
+    {
+    public:
+        AutoSystem(bool initialize = true)
+        {
+            if (initialize)
+                System::initialize();
+        }
+
+        ~AutoSystem()
+        {
+            if (System::exists())
+                System::terminate();
+        }
+
+        void initialize()
+        {
+            System::initialize();
+        }
+
+        void terminate()
+        {
+            System::terminate();
+        }
+    };
+
+
+} // namespace portaudio
+
+// ---------------------------------------------------------------------------------------
+
+#endif // INCLUDED_PORTAUDIO_AUTOSYSTEM_HXX