diff --git a/.gitignore b/.gitignore
index 0107aabcb..9f29f9d10 100644
--- a/.gitignore
+++ b/.gitignore
@@ -143,3 +143,8 @@ Temporary
 # cibuildwheel
 wheelhouse
 tests/test_cibuildwheel/tmp_dockerfiles
+
+# build artifacts
+*.cmake
+Makefile
+*.tmp
\ No newline at end of file
diff --git a/CMakeLists.txt b/CMakeLists.txt
index afd086e8e..bb9718ab6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,19 +4,19 @@ if(POLICY CMP0048)
   cmake_policy(SET CMP0048 NEW)
 endif()
 
-if(UNIX)
+if(APPLE) # APPLE counts as a UNIX, so APPLE must come first 
   set(PYEXT_SUFFIX
       ".so"
       CACHE STRING "Suffix for Python extension modules")
   set(DYNLIB_SUFFIX
-      ".so"
+      ".dylib"
       CACHE STRING "Suffix for dynamic libraries")
-elseif(APPLE)
+elseif(UNIX)
   set(PYEXT_SUFFIX
       ".so"
       CACHE STRING "Suffix for Python extension modules")
   set(DYNLIB_SUFFIX
-      ".dylib"
+      ".so"
       CACHE STRING "Suffix for dynamic libraries")
 elseif(WIN32)
   set(PYEXT_SUFFIX
diff --git a/README.md b/README.md
index a4bd9f2da..3e9c8036e 100644
--- a/README.md
+++ b/README.md
@@ -80,7 +80,7 @@ pip3 install -e .
 
 **Build from source**
 1. `pip install cmake wheel`
-2. `brew install pkg-config lua@5.1 libzip qt5 capnp`
+2. `brew install pkg-config lua@5.3 libzip qt@5 capnp`
 3. `echo 'export PATH="/opt/homebrew/opt/qt@5/bin:$PATH"' >> ~/.zshrc`
 4. `export SDKROOT=$(xcrun --sdk macosx --show-sdk-path)`
 5. `pip install -e .`
diff --git a/cores/pce/mednafen/pce_fast/huc6280.cpp b/cores/pce/mednafen/pce_fast/huc6280.cpp
index 44b60441c..6e32c0f5d 100644
--- a/cores/pce/mednafen/pce_fast/huc6280.cpp
+++ b/cores/pce/mednafen/pce_fast/huc6280.cpp
@@ -40,9 +40,9 @@ uint8 *HuCPUFastMap[0x100];
 
 
 #ifdef HUC6280_CRAZY_VERSION
-#define LOAD_LOCALS_PC()        register uint8 *PC_local = HuCPU.PC;
+#define LOAD_LOCALS_PC()        uint8 *PC_local = HuCPU.PC;
 #else
-#define LOAD_LOCALS_PC()        register uint32 PC_local /*asm ("edi")*/ = HuCPU.PC; // asm ("edi") = HuCPU.PC;
+#define LOAD_LOCALS_PC()        uint32 PC_local /*asm ("edi")*/ = HuCPU.PC; // asm ("edi") = HuCPU.PC;
 #endif
 
 #define LOAD_LOCALS()				\
diff --git a/cores/snes/cpuexec.cpp b/cores/snes/cpuexec.cpp
index b94e3fd94..cc52cc7a5 100644
--- a/cores/snes/cpuexec.cpp
+++ b/cores/snes/cpuexec.cpp
@@ -290,8 +290,8 @@ void S9xMainLoop (void)
 		if (CPU.Flags & SCAN_KEYS_FLAG)
 			break;
 
-		register uint8				Op;
-		register struct	SOpcodes	*Opcodes;
+		uint8				Op;
+		struct	SOpcodes	*Opcodes;
 
 		if (CPU.PCBase)
 		{
diff --git a/cores/snes/gfx.cpp b/cores/snes/gfx.cpp
index 1f0564462..214632fe9 100644
--- a/cores/snes/gfx.cpp
+++ b/cores/snes/gfx.cpp
@@ -683,12 +683,12 @@ void S9xUpdateScreen (void)
 					// ignoring the true, larger size of the buffer.
 					GFX.RealPPL = GFX.Pitch >> 1;
 
-					for (register int32 y = (int32) GFX.StartY - 1; y >= 0; y--)
+					for (int32 y = (int32) GFX.StartY - 1; y >= 0; y--)
 					{
-						register uint16	*p = GFX.Screen + y * GFX.PPL     + 255;
-						register uint16	*q = GFX.Screen + y * GFX.RealPPL + 510;
+						uint16	*p = GFX.Screen + y * GFX.PPL     + 255;
+						uint16	*q = GFX.Screen + y * GFX.RealPPL + 510;
 
-						for (register int x = 255; x >= 0; x--, p--, q -= 2)
+						for (int x = 255; x >= 0; x--, p--, q -= 2)
 							*q = *(q + 1) = *p;
 					}
 
@@ -698,12 +698,12 @@ void S9xUpdateScreen (void)
 			#endif
 				{
 					// Have to back out of the regular speed hack
-					for (register uint32 y = 0; y < GFX.StartY; y++)
+					for (uint32 y = 0; y < GFX.StartY; y++)
 					{
-						register uint16	*p = GFX.Screen + y * GFX.PPL + 255;
-						register uint16	*q = GFX.Screen + y * GFX.PPL + 510;
+						uint16	*p = GFX.Screen + y * GFX.PPL + 255;
+						uint16	*q = GFX.Screen + y * GFX.PPL + 510;
 
-						for (register int x = 255; x >= 0; x--, p--, q -= 2)
+						for (int x = 255; x >= 0; x--, p--, q -= 2)
 							*q = *(q + 1) = *p;
 					}
 				}
@@ -719,7 +719,7 @@ void S9xUpdateScreen (void)
 				GFX.PPL = GFX.RealPPL << 1;
 				GFX.DoInterlace = 2;
 
-				for (register int32 y = (int32) GFX.StartY - 1; y >= 0; y--)
+				for (int32 y = (int32) GFX.StartY - 1; y >= 0; y--)
 					memmove(GFX.Screen + y * GFX.PPL, GFX.Screen + y * GFX.RealPPL, IPPU.RenderedScreenWidth * sizeof(uint16));
 			}
 		}
diff --git a/cores/snes/sa1cpu.cpp b/cores/snes/sa1cpu.cpp
index abe19ced6..fe079fce7 100644
--- a/cores/snes/sa1cpu.cpp
+++ b/cores/snes/sa1cpu.cpp
@@ -314,8 +314,8 @@ void S9xSA1MainLoop (void)
 			S9xSA1Trace();
 	#endif
 
-		register uint8				Op;
-		register struct SOpcodes	*Opcodes;
+		uint8				Op;
+		struct SOpcodes	*Opcodes;
 
 		if (SA1.PCBase)
 		{
diff --git a/cores/snes/tile.cpp b/cores/snes/tile.cpp
index 95177cf99..564f09e3f 100644
--- a/cores/snes/tile.cpp
+++ b/cores/snes/tile.cpp
@@ -205,11 +205,11 @@ static uint8	hrbit_even[256];
 
 void S9xInitTileRenderer (void)
 {
-	register int	i;
+	int	i;
 
 	for (i = 0; i < 16; i++)
 	{
-		register uint32	b = 0;
+		uint32	b = 0;
 
 	#ifdef LSB_FIRST
 		if (i & 8)
@@ -237,8 +237,8 @@ void S9xInitTileRenderer (void)
 
 	for (i = 0; i < 256; i++)
 	{
-		register uint8	m = 0;
-		register uint8	s = 0;
+		uint8	m = 0;
+		uint8	s = 0;
 
 		if (i & 0x80)
 			s |= 8;
@@ -274,7 +274,7 @@ void S9xInitTileRenderer (void)
 
 static uint8 ConvertTile2 (uint8 *pCache, uint32 TileAddr, uint32)
 {
-	register uint8	*tp      = &Memory.VRAM[TileAddr];
+	uint8	*tp      = &Memory.VRAM[TileAddr];
 	uint32			*p       = (uint32 *) pCache;
 	uint32			non_zero = 0;
 	uint8			line;
@@ -283,7 +283,7 @@ static uint8 ConvertTile2 (uint8 *pCache, uint32 TileAddr, uint32)
 	{
 		uint32			p1 = 0;
 		uint32			p2 = 0;
-		register uint8	pix;
+		uint8	pix;
 
 		DOBIT( 0, 0);
 		DOBIT( 1, 1);
@@ -297,7 +297,7 @@ static uint8 ConvertTile2 (uint8 *pCache, uint32 TileAddr, uint32)
 
 static uint8 ConvertTile4 (uint8 *pCache, uint32 TileAddr, uint32)
 {
-	register uint8	*tp      = &Memory.VRAM[TileAddr];
+	uint8	*tp      = &Memory.VRAM[TileAddr];
 	uint32			*p       = (uint32 *) pCache;
 	uint32			non_zero = 0;
 	uint8			line;
@@ -306,7 +306,7 @@ static uint8 ConvertTile4 (uint8 *pCache, uint32 TileAddr, uint32)
 	{
 		uint32			p1 = 0;
 		uint32			p2 = 0;
-		register uint8	pix;
+		uint8	pix;
 
 		DOBIT( 0, 0);
 		DOBIT( 1, 1);
@@ -322,7 +322,7 @@ static uint8 ConvertTile4 (uint8 *pCache, uint32 TileAddr, uint32)
 
 static uint8 ConvertTile8 (uint8 *pCache, uint32 TileAddr, uint32)
 {
-	register uint8	*tp      = &Memory.VRAM[TileAddr];
+	uint8	*tp      = &Memory.VRAM[TileAddr];
 	uint32			*p       = (uint32 *) pCache;
 	uint32			non_zero = 0;
 	uint8			line;
@@ -331,7 +331,7 @@ static uint8 ConvertTile8 (uint8 *pCache, uint32 TileAddr, uint32)
 	{
 		uint32			p1 = 0;
 		uint32			p2 = 0;
-		register uint8	pix;
+		uint8	pix;
 
 		DOBIT( 0, 0);
 		DOBIT( 1, 1);
@@ -359,7 +359,7 @@ static uint8 ConvertTile8 (uint8 *pCache, uint32 TileAddr, uint32)
 
 static uint8 ConvertTile2h_odd (uint8 *pCache, uint32 TileAddr, uint32 Tile)
 {
-	register uint8	*tp1     = &Memory.VRAM[TileAddr], *tp2;
+	uint8	*tp1     = &Memory.VRAM[TileAddr], *tp2;
 	uint32			*p       = (uint32 *) pCache;
 	uint32			non_zero = 0;
 	uint8			line;
@@ -373,7 +373,7 @@ static uint8 ConvertTile2h_odd (uint8 *pCache, uint32 TileAddr, uint32 Tile)
 	{
 		uint32			p1 = 0;
 		uint32			p2 = 0;
-		register uint8	pix;
+		uint8	pix;
 
 		DOBIT( 0, 0);
 		DOBIT( 1, 1);
@@ -387,7 +387,7 @@ static uint8 ConvertTile2h_odd (uint8 *pCache, uint32 TileAddr, uint32 Tile)
 
 static uint8 ConvertTile4h_odd (uint8 *pCache, uint32 TileAddr, uint32 Tile)
 {
-	register uint8	*tp1     = &Memory.VRAM[TileAddr], *tp2;
+	uint8	*tp1     = &Memory.VRAM[TileAddr], *tp2;
 	uint32			*p       = (uint32 *) pCache;
 	uint32			non_zero = 0;
 	uint8			line;
@@ -401,7 +401,7 @@ static uint8 ConvertTile4h_odd (uint8 *pCache, uint32 TileAddr, uint32 Tile)
 	{
 		uint32			p1 = 0;
 		uint32			p2 = 0;
-		register uint8	pix;
+		uint8	pix;
 
 		DOBIT( 0, 0);
 		DOBIT( 1, 1);
@@ -425,7 +425,7 @@ static uint8 ConvertTile4h_odd (uint8 *pCache, uint32 TileAddr, uint32 Tile)
 
 static uint8 ConvertTile2h_even (uint8 *pCache, uint32 TileAddr, uint32 Tile)
 {
-	register uint8	*tp1     = &Memory.VRAM[TileAddr], *tp2;
+	uint8	*tp1     = &Memory.VRAM[TileAddr], *tp2;
 	uint32			*p       = (uint32 *) pCache;
 	uint32			non_zero = 0;
 	uint8			line;
@@ -439,7 +439,7 @@ static uint8 ConvertTile2h_even (uint8 *pCache, uint32 TileAddr, uint32 Tile)
 	{
 		uint32			p1 = 0;
 		uint32			p2 = 0;
-		register uint8	pix;
+		uint8	pix;
 
 		DOBIT( 0, 0);
 		DOBIT( 1, 1);
@@ -453,7 +453,7 @@ static uint8 ConvertTile2h_even (uint8 *pCache, uint32 TileAddr, uint32 Tile)
 
 static uint8 ConvertTile4h_even (uint8 *pCache, uint32 TileAddr, uint32 Tile)
 {
-	register uint8	*tp1     = &Memory.VRAM[TileAddr], *tp2;
+	uint8	*tp1     = &Memory.VRAM[TileAddr], *tp2;
 	uint32			*p       = (uint32 *) pCache;
 	uint32			non_zero = 0;
 	uint8			line;
@@ -467,7 +467,7 @@ static uint8 ConvertTile4h_even (uint8 *pCache, uint32 TileAddr, uint32 Tile)
 	{
 		uint32			p1 = 0;
 		uint32			p2 = 0;
-		register uint8	pix;
+		uint8	pix;
 
 		DOBIT( 0, 0);
 		DOBIT( 1, 1);
@@ -748,8 +748,8 @@ void S9xSelectTileConverter (int depth, bool8 hires, bool8 sub, bool8 mosaic)
 
 #define DRAW_TILE() \
 	uint8			*pCache; \
-	register int32	l; \
-	register uint8	*bp, Pix; \
+	int32	l; \
+	uint8	*bp, Pix; \
 	\
 	GET_CACHED_TILE(); \
 	if (IS_BLANK_TILE()) \
@@ -839,8 +839,8 @@ void S9xSelectTileConverter (int depth, bool8 hires, bool8 sub, bool8 mosaic)
 
 #define DRAW_TILE() \
 	uint8			*pCache; \
-	register int32	l; \
-	register uint8	*bp, Pix, w; \
+	int32	l; \
+	uint8	*bp, Pix, w; \
 	\
 	GET_CACHED_TILE(); \
 	if (IS_BLANK_TILE()) \
@@ -947,8 +947,8 @@ void S9xSelectTileConverter (int depth, bool8 hires, bool8 sub, bool8 mosaic)
 
 #define DRAW_TILE() \
 	uint8			*pCache; \
-	register int32	l, w; \
-	register uint8	Pix; \
+	int32	l, w; \
+	uint8	Pix; \
 	\
 	GET_CACHED_TILE(); \
 	if (IS_BLANK_TILE()) \
@@ -996,7 +996,7 @@ void S9xSelectTileConverter (int depth, bool8 hires, bool8 sub, bool8 mosaic)
 #define Pix				0
 
 #define DRAW_TILE() \
-	register uint32	l, x; \
+	uint32	l, x; \
 	\
 	GFX.RealScreenColors = IPPU.ScreenColors; \
 	GFX.ScreenColors = GFX.ClipColors ? BlackColourMap : GFX.RealScreenColors; \
diff --git a/retro/examples/best.bk2 b/retro/examples/best.bk2
index 4773792fd..78364a455 100644
Binary files a/retro/examples/best.bk2 and b/retro/examples/best.bk2 differ