I think Darwin shouldn't define LINUX.

Add framework for the OSS driver (not yet used).

stepmania/src/arch/arch.cpp

@@ -13,8 +13,10 @@
 #include "arch_default.h"
 
 /* Override them with arch-specific drivers, as available. */
-#if defined(LINUX) && !(defined DARWIN)
+#if defined(LINUX)
 #include "arch_linux.h"
+#elif defined(DARWIN)
+// #include "arch_darwin.h"
 #elif defined(WIN32)
 #include "arch_Win32.h"
 #endif
@@ -35,6 +37,11 @@ void MakeInputHandlers(vector<InputHandler *> &Add)
 #endif
 }
 
+#if defined(LINUX)
+// #define HAVE_OSS
+#define HAVE_ALSA
+#endif
+
 /* Err, this is ugly--breaks arch encapsulation. Hmm. */
 RageSoundDriver *MakeRageSoundDriver(CString drivers)
 {
@@ -55,8 +62,11 @@ RageSoundDriver *MakeRageSoundDriver(CString drivers)
 			if(!DriversToTry[i].CompareNoCase("DirectSound-sw")) ret = new RageSound_DSound_Software;
 			if(!DriversToTry[i].CompareNoCase("WaveOut")) ret = new RageSound_WaveOut;
 #endif
-#if defined(LINUX) && !defined(DARWIN)	/* should use some define akin to HAS_ALSA9 */
+#ifdef HAVE_ALSA
 			if(!DriversToTry[i].CompareNoCase("ALSA9")) ret = new RageSound_ALSA9;
+#endif		
+#ifdef HAVE_OSS
+			if(!DriversToTry[i].CompareNoCase("OSS")) ret = new RageSound_OSS;
 #endif		
 			if(!DriversToTry[i].CompareNoCase("Null")) ret = new RageSound_Null;
 			if( !ret )

stepmania/src/arch/arch.h

@@ -17,9 +17,12 @@ LowLevelWindow *MakeLowLevelWindow();
 void MakeInputHandlers(vector<InputHandler *> &Add);
 RageSoundDriver *MakeRageSoundDriver(CString drivers);
 
-/* Define the default list of sound drivers for each arch. */
-#if defined(LINUX) && !defined(DARWIN)
-#define DEFAULT_SOUND_DRIVER_LIST "ALSA9,Null"
+/* Define the default list of sound drivers for each arch.  It's
+ * OK to list drivers that may not be available. */
+#if defined(LINUX)
+#define DEFAULT_SOUND_DRIVER_LIST "ALSA9,OSS,Null"
+#elif defined(DARWIN)
+#define DEFAULT_SOUND_DRIVER_LIST "Null" /* XXX */
 #elif defined(WIN32)
 #define DEFAULT_SOUND_DRIVER_LIST "DirectSound,DirectSound-sw,WaveOut"
 #else