diff --git a/src/cocoa/i_backend_cocoa.mm b/src/cocoa/i_backend_cocoa.mm
index 089d07f0d..5d4aac859 100644
--- a/src/cocoa/i_backend_cocoa.mm
+++ b/src/cocoa/i_backend_cocoa.mm
@@ -45,80 +45,6 @@
 #include <OpenGL/gl.h>
 #include <OpenGL/glext.h>
 
-#if MAC_OS_X_VERSION_MIN_REQUIRED < 1050
-
-// Missing definitions for 10.4 and earlier
-
-typedef unsigned int NSUInteger;
-typedef          int NSInteger;
-
-typedef float CGFloat;
-
-// From HIToolbox/Events.h
-enum 
-{
-	kVK_Return                    = 0x24,
-	kVK_Tab                       = 0x30,
-	kVK_Space                     = 0x31,
-	kVK_Delete                    = 0x33,
-	kVK_Escape                    = 0x35,
-	kVK_Command                   = 0x37,
-	kVK_Shift                     = 0x38,
-	kVK_CapsLock                  = 0x39,
-	kVK_Option                    = 0x3A,
-	kVK_Control                   = 0x3B,
-	kVK_RightShift                = 0x3C,
-	kVK_RightOption               = 0x3D,
-	kVK_RightControl              = 0x3E,
-	kVK_Function                  = 0x3F,
-	kVK_F17                       = 0x40,
-	kVK_VolumeUp                  = 0x48,
-	kVK_VolumeDown                = 0x49,
-	kVK_Mute                      = 0x4A,
-	kVK_F18                       = 0x4F,
-	kVK_F19                       = 0x50,
-	kVK_F20                       = 0x5A,
-	kVK_F5                        = 0x60,
-	kVK_F6                        = 0x61,
-	kVK_F7                        = 0x62,
-	kVK_F3                        = 0x63,
-	kVK_F8                        = 0x64,
-	kVK_F9                        = 0x65,
-	kVK_F11                       = 0x67,
-	kVK_F13                       = 0x69,
-	kVK_F16                       = 0x6A,
-	kVK_F14                       = 0x6B,
-	kVK_F10                       = 0x6D,
-	kVK_F12                       = 0x6F,
-	kVK_F15                       = 0x71,
-	kVK_Help                      = 0x72,
-	kVK_Home                      = 0x73,
-	kVK_PageUp                    = 0x74,
-	kVK_ForwardDelete             = 0x75,
-	kVK_F4                        = 0x76,
-	kVK_End                       = 0x77,
-	kVK_F2                        = 0x78,
-	kVK_PageDown                  = 0x79,
-	kVK_F1                        = 0x7A,
-	kVK_LeftArrow                 = 0x7B,
-	kVK_RightArrow                = 0x7C,
-	kVK_DownArrow                 = 0x7D,
-	kVK_UpArrow                   = 0x7E
-};
-
-@interface NSView(SupportOutdatedOSX)
-- (NSPoint)convertPointFromBase:(NSPoint)aPoint;
-@end
-
-@implementation NSView(SupportOutdatedOSX)
-- (NSPoint)convertPointFromBase:(NSPoint)aPoint
-{
-    return [self convertPoint:aPoint fromView:nil];
-}
-@end
-
-#endif // prior to 10.5
-
 #include <SDL.h>
 
 // Avoid collision between DObject class and Objective-C
@@ -679,7 +605,7 @@ void NSEventToGameMousePosition(NSEvent* inEvent, event_t* outEvent)
 
 	const NSPoint   viewPos = IsHiDPISupported()
 		? [view convertPointToBacking:windowPos]
-		: [view convertPointFromBase:windowPos];
+		: [view convertPoint:windowPos fromView:nil];
 
 	const CGFloat frameHeight = GetRealContentViewSize(window).height;
 
diff --git a/src/sdl/iwadpicker_cocoa.mm b/src/sdl/iwadpicker_cocoa.mm
index 57a4ce7f4..29b0454de 100644
--- a/src/sdl/iwadpicker_cocoa.mm
+++ b/src/sdl/iwadpicker_cocoa.mm
@@ -50,11 +50,6 @@
 #include <wordexp.h>
 #include <unistd.h>
 
-#if MAC_OS_X_VERSION_MIN_REQUIRED < 1050
-// Missing type definition for 10.4 and earlier
-typedef unsigned int NSUInteger;
-#endif // prior to 10.5
-
 CVAR(String, osx_additional_parameters, "", CVAR_ARCHIVE | CVAR_NOSET | CVAR_GLOBALCONFIG);
 
 enum
diff --git a/src/sdl/sdlvideo.cpp b/src/sdl/sdlvideo.cpp
index 6753169f0..c869545ab 100644
--- a/src/sdl/sdlvideo.cpp
+++ b/src/sdl/sdlvideo.cpp
@@ -550,13 +550,6 @@ void SDLFB::SetVSync (bool vsync)
 	{
 		// Apply vsync for native backend only (where OpenGL context is set)
 
-#if MAC_OS_X_VERSION_MIN_REQUIRED < 1050
-		// Inconsistency between 10.4 and 10.5 SDKs:
-		// third argument of CGLSetParameter() is const long* on 10.4 and const GLint* on 10.5
-		// So, GLint typedef'ed to long instead of int to workaround this issue
-		typedef long GLint;
-#endif // prior to 10.5
-		
 		const GLint value = vsync ? 1 : 0;
 		CGLSetParameter(context, kCGLCPSwapInterval, &value);
 	}