diff --git a/src/blitter/factory.hpp b/src/blitter/factory.hpp
index e97fe53de7..30a70570be 100644
--- a/src/blitter/factory.hpp
+++ b/src/blitter/factory.hpp
@@ -16,9 +16,6 @@
 #include "../core/string_compare_type.hpp"
 #include <map>
 
-#if defined(WITH_COCOA)
-bool QZ_CanDisplay8bpp();
-#endif /* defined(WITH_COCOA) */
 
 /**
  * The base factory, keeping track of all blitters.
@@ -113,19 +110,11 @@ public:
 	{
 #if defined(DEDICATED)
 		const char *default_blitter = "null";
+#elif defined(WITH_COCOA)
+		const char *default_blitter = "32bpp-anim";
 #else
 		const char *default_blitter = "8bpp-optimized";
-
-#if defined(WITH_COCOA)
-		/* Some people reported lack of fullscreen support in 8 bpp mode.
-		 * While we prefer 8 bpp since it's faster, we will still have to test for support. */
-		if (!QZ_CanDisplay8bpp()) {
-			/* The main display can't go to 8 bpp fullscreen mode.
-			 * We will have to switch to 32 bpp by default. */
-			default_blitter = "32bpp-anim";
-		}
-#endif /* defined(WITH_COCOA) */
-#endif /* defined(DEDICATED) */
+#endif
 		if (GetBlitters().size() == 0) return nullptr;
 		const char *bname = (StrEmpty(name)) ? default_blitter : name;
 
diff --git a/src/video/cocoa/cocoa_v.h b/src/video/cocoa/cocoa_v.h
index ee8c29c85d..7286c685b8 100644
--- a/src/video/cocoa/cocoa_v.h
+++ b/src/video/cocoa/cocoa_v.h
@@ -190,10 +190,8 @@ public:
 extern CocoaSubdriver *_cocoa_subdriver;
 
 #ifdef ENABLE_COCOA_QUARTZ
-#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_4
 CocoaSubdriver *QZ_CreateWindowQuartzSubdriver(int width, int height, int bpp);
 #endif
-#endif
 
 void QZ_GameSizeChanged();
 
@@ -223,16 +221,7 @@ uint QZ_ListModes(OTTD_Point *modes, uint max_modes, CGDirectDisplayID display_i
 @end
 
 /** Subclass of NSView to fix Quartz rendering and mouse awareness */
-@interface OTTD_CocoaView : NSView
-#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5
-#	if MAC_OS_X_VERSION_MIN_REQUIRED <= MAC_OS_X_VERSION_10_4
-		<NSTextInputClient, NSTextInput>
-#	else
-		<NSTextInputClient>
-#	endif /* MAC_OS_X_VERSION_MIN_REQUIRED <= MAC_OS_X_VERSION_10_4 */
-#else
-	<NSTextInput>
-#endif /* MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5 */
+@interface OTTD_CocoaView : NSView <NSTextInputClient>
 {
 	CocoaSubdriver *driver;
 	NSTrackingRectTag trackingtag;
@@ -252,10 +241,7 @@ uint QZ_ListModes(OTTD_Point *modes, uint max_modes, CGDirectDisplayID display_i
 @end
 
 /** Delegate for our NSWindow to send ask for quit on close */
-@interface OTTD_CocoaWindowDelegate : NSObject
-#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_6
-	<NSWindowDelegate>
-#endif
+@interface OTTD_CocoaWindowDelegate : NSObject <NSWindowDelegate>
 {
 	CocoaSubdriver *driver;
 }
diff --git a/src/video/cocoa/cocoa_v.mm b/src/video/cocoa/cocoa_v.mm
index 678fc75be5..13a9cc9c47 100644
--- a/src/video/cocoa/cocoa_v.mm
+++ b/src/video/cocoa/cocoa_v.mm
@@ -45,10 +45,7 @@
  */
 
 
-@interface OTTDMain : NSObject
-#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_6
-	<NSApplicationDelegate>
-#endif
+@interface OTTDMain : NSObject <NSApplicationDelegate>
 @end
 
 
@@ -159,7 +156,9 @@ static void setApplicationMenu()
 	/* Tell the application object that this is now the application menu.
 	 * This interesting Objective-C construct is used because not all SDK
 	 * versions define this method publicly. */
-	[ NSApp performSelector:@selector(setAppleMenu:) withObject:appleMenu ];
+	if ([ NSApp respondsToSelector:@selector(setAppleMenu:) ]) {
+		[ NSApp performSelector:@selector(setAppleMenu:) withObject:appleMenu ];
+	}
 
 	/* Finally give up our references to the objects */
 	[ appleMenu release ];
@@ -204,13 +203,9 @@ static void setupApplication()
 	/* Ensure the application object is initialised */
 	[ NSApplication sharedApplication ];
 
-#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_3
 	/* Tell the dock about us */
-	if (MacOSVersionIsAtLeast(10, 3, 0)) {
-		OSStatus returnCode = TransformProcessType(&psn, kProcessTransformToForegroundApplication);
-		if (returnCode != 0) DEBUG(driver, 0, "Could not change to foreground application. Error %d", (int)returnCode);
-	}
-#endif
+	OSStatus returnCode = TransformProcessType(&psn, kProcessTransformToForegroundApplication);
+	if (returnCode != 0) DEBUG(driver, 0, "Could not change to foreground application. Error %d", (int)returnCode);
 
 	/* Disable the system-wide tab feature as we only have one window. */
 	if ([ NSWindow respondsToSelector:@selector(setAllowsAutomaticWindowTabbing:) ]) {
@@ -243,57 +238,27 @@ static bool ModeSorter(const OTTD_Point &p1, const OTTD_Point &p2)
 
 static void QZ_GetDisplayModeInfo(CFArrayRef modes, CFIndex i, int &bpp, uint16 &width, uint16 &height)
 {
-	bpp = 0;
-	width = 0;
-	height = 0;
+	CGDisplayModeRef mode = (CGDisplayModeRef)CFArrayGetValueAtIndex(modes, i);
 
-#if (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_6)
-	if (MacOSVersionIsAtLeast(10, 6, 0)) {
-		CGDisplayModeRef mode = (CGDisplayModeRef)CFArrayGetValueAtIndex(modes, i);
-
-		width = (uint16)CGDisplayModeGetWidth(mode);
-		height = (uint16)CGDisplayModeGetHeight(mode);
+	width = (uint16)CGDisplayModeGetWidth(mode);
+	height = (uint16)CGDisplayModeGetHeight(mode);
 
 #if (MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_11)
-		/* Extract bit depth from mode string. */
-		CFAutoRelease<CFStringRef> pixEnc(CGDisplayModeCopyPixelEncoding(mode));
-		if (CFStringCompare(pixEnc.get(), CFSTR(IO32BitDirectPixels), kCFCompareCaseInsensitive) == kCFCompareEqualTo) bpp = 32;
-		if (CFStringCompare(pixEnc.get(), CFSTR(IO16BitDirectPixels), kCFCompareCaseInsensitive) == kCFCompareEqualTo) bpp = 16;
-		if (CFStringCompare(pixEnc.get(), CFSTR(IO8BitIndexedPixels), kCFCompareCaseInsensitive) == kCFCompareEqualTo) bpp = 8;
+	/* Extract bit depth from mode string. */
+	CFAutoRelease<CFStringRef> pixEnc(CGDisplayModeCopyPixelEncoding(mode));
+	if (CFStringCompare(pixEnc.get(), CFSTR(IO32BitDirectPixels), kCFCompareCaseInsensitive) == kCFCompareEqualTo) bpp = 32;
+	if (CFStringCompare(pixEnc.get(), CFSTR(IO16BitDirectPixels), kCFCompareCaseInsensitive) == kCFCompareEqualTo) bpp = 16;
+	if (CFStringCompare(pixEnc.get(), CFSTR(IO8BitIndexedPixels), kCFCompareCaseInsensitive) == kCFCompareEqualTo) bpp = 8;
 #else
-		/* CGDisplayModeCopyPixelEncoding is deprecated on OSX 10.11+, but there are no 8 bpp modes anyway... */
-		bpp = 32;
+	/* CGDisplayModeCopyPixelEncoding is deprecated on OSX 10.11+, but there are no 8 bpp modes anyway... */
+	bpp = 32;
 #endif
-	} else
-#endif
-	{
-		int intvalue;
-
-		CFDictionaryRef onemode = (const __CFDictionary*)CFArrayGetValueAtIndex(modes, i);
-		CFNumberRef number = (const __CFNumber*)CFDictionaryGetValue(onemode, kCGDisplayBitsPerPixel);
-		CFNumberGetValue(number, kCFNumberSInt32Type, &intvalue);
-		bpp = intvalue;
-
-		number = (const __CFNumber*)CFDictionaryGetValue(onemode, kCGDisplayWidth);
-		CFNumberGetValue(number, kCFNumberSInt32Type, &intvalue);
-		width = (uint16)intvalue;
-
-		number = (const __CFNumber*)CFDictionaryGetValue(onemode, kCGDisplayHeight);
-		CFNumberGetValue(number, kCFNumberSInt32Type, &intvalue);
-		height = (uint16)intvalue;
-	}
 }
 
 uint QZ_ListModes(OTTD_Point *modes, uint max_modes, CGDirectDisplayID display_id, int device_depth)
 {
-#if (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_6) && (MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_6)
-	CFArrayRef mode_list = MacOSVersionIsAtLeast(10, 6, 0) ? CGDisplayCopyAllDisplayModes(display_id, NULL) : CGDisplayAvailableModes(display_id);
-#elif (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_6)
-	CFArrayRef mode_list = CGDisplayCopyAllDisplayModes(display_id, NULL);
-#else
-	CFArrayRef mode_list = CGDisplayAvailableModes(display_id);
-#endif
-	CFIndex    num_modes = CFArrayGetCount(mode_list);
+	CFAutoRelease<CFArrayRef> mode_list(CGDisplayCopyAllDisplayModes(display_id, nullptr));
+	CFIndex num_modes = CFArrayGetCount(mode_list.get());
 
 	/* Build list of modes with the requested bpp */
 	uint count = 0;
@@ -301,7 +266,7 @@ uint QZ_ListModes(OTTD_Point *modes, uint max_modes, CGDirectDisplayID display_i
 		int bpp;
 		uint16 width, height;
 
-		QZ_GetDisplayModeInfo(mode_list, i, bpp, width, height);
+		QZ_GetDisplayModeInfo(mode_list.get(), i, bpp, width, height);
 
 		if (bpp != device_depth) continue;
 
@@ -325,29 +290,9 @@ uint QZ_ListModes(OTTD_Point *modes, uint max_modes, CGDirectDisplayID display_i
 	/* Sort list smallest to largest */
 	std::sort(modes, modes + count, ModeSorter);
 
-#if (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_6)
-	if (MacOSVersionIsAtLeast(10, 6, 0)) CFRelease(mode_list);
-#endif
-
 	return count;
 }
 
-/** Small function to test if the main display can display 8 bpp in fullscreen */
-bool QZ_CanDisplay8bpp()
-{
-	/* 8bpp modes are deprecated starting in 10.5. CoreGraphics will return them
-	 * as available in the display list, but many features (e.g. palette animation)
-	 * will be broken. */
-	if (MacOSVersionIsAtLeast(10, 5, 0)) return false;
-
-	OTTD_Point p;
-
-	/* We want to know if 8 bpp is possible in fullscreen and not anything about
-	 * resolutions. Because of this we want to fill a list of 1 resolution of 8 bpp
-	 * on display 0 (main) and return if we found one. */
-	return QZ_ListModes(&p, 1, 0, 8);
-}
-
 /**
  * Update the video modus.
  *
@@ -395,7 +340,7 @@ void QZ_GameSizeChanged()
  */
 static CocoaSubdriver *QZ_CreateWindowSubdriver(int width, int height, int bpp)
 {
-#if defined(ENABLE_COCOA_QUARTZ) && (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_4)
+#if defined(ENABLE_COCOA_QUARTZ)
 	return QZ_CreateWindowQuartzSubdriver(width, height, bpp);
 #else
 	return nullptr;
@@ -453,7 +398,7 @@ void VideoDriver_Cocoa::Stop()
  */
 const char *VideoDriver_Cocoa::Start(const char * const *parm)
 {
-	if (!MacOSVersionIsAtLeast(10, 3, 0)) return "The Cocoa video driver requires Mac OS X 10.3 or later.";
+	if (!MacOSVersionIsAtLeast(10, 6, 0)) return "The Cocoa video driver requires Mac OS X 10.6 or later.";
 
 	if (_cocoa_video_started) return "Already started";
 	_cocoa_video_started = true;
@@ -554,16 +499,7 @@ bool VideoDriver_Cocoa::AfterBlitterChange()
  */
 void VideoDriver_Cocoa::EditBoxLostFocus()
 {
-	if (_cocoa_subdriver != NULL) {
-		if ([ _cocoa_subdriver->cocoaview respondsToSelector:@selector(inputContext) ] && [ [ _cocoa_subdriver->cocoaview performSelector:@selector(inputContext) ] respondsToSelector:@selector(discardMarkedText) ]) {
-			[ [ _cocoa_subdriver->cocoaview performSelector:@selector(inputContext) ] performSelector:@selector(discardMarkedText) ];
-		}
-#if (MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_6)
-		else {
-			[ [ NSInputManager currentInputManager ] markedTextAbandoned:_cocoa_subdriver->cocoaview ];
-		}
-#endif
-	}
+	if (_cocoa_subdriver != NULL) [ [ _cocoa_subdriver->cocoaview inputContext ] discardMarkedText ];
 	/* Clear any marked string from the current edit box. */
 	HandleTextInput(NULL, true);
 }
@@ -589,22 +525,13 @@ void CocoaDialog(const char *title, const char *message, const char *buttonLabel
 		return;
 	}
 
-#if (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_3)
-	if (MacOSVersionIsAtLeast(10, 3, 0)) {
-		NSAlert *alert = [ [ NSAlert alloc ] init ];
-		[ alert setAlertStyle: NSCriticalAlertStyle ];
-		[ alert setMessageText:[ NSString stringWithUTF8String:title ] ];
-		[ alert setInformativeText:[ NSString stringWithUTF8String:message ] ];
-		[ alert addButtonWithTitle: [ NSString stringWithUTF8String:buttonLabel ] ];
-		[ alert runModal ];
-		[ alert release ];
-	} else
-#endif
-	{
-#if (MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_3)
-		NSRunAlertPanel([ NSString stringWithUTF8String:title ], [ NSString stringWithUTF8String:message ], [ NSString stringWithUTF8String:buttonLabel ], nil, nil);
-#endif
-	}
+	NSAlert *alert = [ [ NSAlert alloc ] init ];
+	[ alert setAlertStyle: NSCriticalAlertStyle ];
+	[ alert setMessageText:[ NSString stringWithUTF8String:title ] ];
+	[ alert setInformativeText:[ NSString stringWithUTF8String:message ] ];
+	[ alert addButtonWithTitle: [ NSString stringWithUTF8String:buttonLabel ] ];
+	[ alert runModal ];
+	[ alert release ];
 
 	if (!wasstarted && VideoDriver::GetInstance() != NULL) VideoDriver::GetInstance()->Stop();
 
@@ -1030,17 +957,7 @@ static const char *Utf8AdvanceByUtf16Units(const char *str, NSUInteger count)
 {
 	if (!EditBoxInGlobalFocus()) return NSNotFound;
 
-	NSPoint view_pt = NSZeroPoint;
-#if (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_7)
-	if ([ [ self window ] respondsToSelector:@selector(convertRectFromScreen:) ]) {
-		view_pt = [ self convertRect:[ [ self window ] convertRectFromScreen:NSMakeRect(thePoint.x, thePoint.y, 0, 0) ] fromView:nil ].origin;
-	} else
-#endif
-	{
-#if (MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_7)
-		view_pt = [ self convertPoint:[ [ self window ] convertScreenToBase:thePoint ] fromView:nil ];
-#endif
-	}
+	NSPoint view_pt = [ self convertRect:[ [ self window ] convertRectFromScreen:NSMakeRect(thePoint.x, thePoint.y, 0, 0) ] fromView:nil ].origin;
 
 	Point pt = { (int)view_pt.x, (int)[ self frame ].size.height - (int)view_pt.y };
 
@@ -1063,19 +980,7 @@ static const char *Utf8AdvanceByUtf16Units(const char *str, NSUInteger count)
 	Rect r = _focused_window->GetTextBoundingRect(start, end);
 	NSRect view_rect = NSMakeRect(_focused_window->left + r.left, [ self frame ].size.height - _focused_window->top - r.bottom, r.right - r.left, r.bottom - r.top);
 
-#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_7
-	if ([ [ self window ] respondsToSelector:@selector(convertRectToScreen:) ]) {
-		return [ [ self window ] convertRectToScreen:[ self convertRect:view_rect toView:nil ] ];
-	}
-#endif
-
-#if MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_7
-	NSRect window_rect = [ self convertRect:view_rect toView:nil ];
-	NSPoint origin = [ [ self window ] convertBaseToScreen:window_rect.origin ];
-	return NSMakeRect(origin.x, origin.y, window_rect.size.width, window_rect.size.height);
-#else
-	return NSMakeRect(0, 0, 0, 0);;
-#endif
+	return [ [ self window ] convertRectToScreen:[ self convertRect:view_rect toView:nil ] ];
 }
 
 /** Get the bounding rect for the given range. */
@@ -1090,16 +995,6 @@ static const char *Utf8AdvanceByUtf16Units(const char *str, NSUInteger count)
 	return [ NSArray array ];
 }
 
-/** Identifier for this text input instance. */
-#if MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_5
-- (long)conversationIdentifier
-#else
-- (NSInteger)conversationIdentifier
-#endif
-{
-	return 0;
-}
-
 /** Delete single character left of the cursor. */
 - (void)deleteBackward:(id)sender
 {
diff --git a/src/video/cocoa/event.mm b/src/video/cocoa/event.mm
index f45c3e971f..cb3c753aca 100644
--- a/src/video/cocoa/event.mm
+++ b/src/video/cocoa/event.mm
@@ -59,28 +59,12 @@ enum RightMouseButtonEmulationState {
 static unsigned int _current_mods;
 static bool _tab_is_down;
 static bool _emulating_right_button;
-#if (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5)
 static float _current_magnification;
-#endif
 #ifdef _DEBUG
 static uint32 _tEvent;
 #endif
 
 
-/* Support for touch gestures is only available starting with the
- * 10.6 SDK, even if it says that support starts in fact with 10.5.2.
- * Replicate the needed stuff for older SDKs. */
-#if (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5 && MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_6)
-static const NSUInteger NSEventTypeMagnify    = 30;
-static const NSUInteger NSEventTypeEndGesture = 20;
-
-@interface NSEvent ()
-/* This message is valid for events of type NSEventTypeMagnify, on 10.5.2 or later */
-- (CGFloat)magnification WEAK_IMPORT_ATTRIBUTE;
-@end
-#endif
-
-
 static uint32 GetTick()
 {
 	struct timeval tim;
@@ -579,16 +563,13 @@ static bool QZ_PollEvent()
 			CGFloat deltaY;
 
 			/* Use precise scrolling-specific deltas if they're supported. */
-#if (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_7)
 			if ([event respondsToSelector:@selector(hasPreciseScrollingDeltas)]) {
 				/* No precise deltas indicates a scroll wheel is being used, so we don't want 2D scrolling. */
 				if (![ event hasPreciseScrollingDeltas ]) break;
 
 				deltaX = [ event scrollingDeltaX ] * 0.5f;
 				deltaY = [ event scrollingDeltaY ] * 0.5f;
-			} else
-#endif
-			{
+			} else {
 				deltaX = [ event deltaX ] * 5;
 				deltaY = [ event deltaY ] * 5;
 			}
@@ -598,7 +579,6 @@ static bool QZ_PollEvent()
 
 			break;
 
-#if (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5)
 		case NSEventTypeMagnify:
 			/* Pinch open or close gesture. */
 			_current_magnification += [ event magnification ] * 5.0f;
@@ -619,7 +599,6 @@ static bool QZ_PollEvent()
 			/* Gesture ended. */
 			_current_magnification = 0.0f;
 			break;
-#endif
 
 		case NSCursorUpdate:
 		case NSMouseEntered:
diff --git a/src/video/cocoa/wnd_quartz.mm b/src/video/cocoa/wnd_quartz.mm
index c73dd32e7d..8549100d90 100644
--- a/src/video/cocoa/wnd_quartz.mm
+++ b/src/video/cocoa/wnd_quartz.mm
@@ -17,8 +17,6 @@
 #include "../../stdafx.h"
 #include "../../os/macosx/macos.h"
 
-#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_4
-
 #define Rect  OTTDRect
 #define Point OTTDPoint
 #import <Cocoa/Cocoa.h>
@@ -194,21 +192,6 @@ void WindowQuartzSubdriver::GetDeviceInfo()
 	/* Initialize the video settings; this data persists between mode switches
 	 * and gather some information that is useful to know about the display */
 
-#	if MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_6
-	/* This way is deprecated as of OSX 10.6 but continues to work.Thus use it
-	 * always, unless allowed to skip compatibility with 10.5 and earlier */
-	CFDictionaryRef cur_mode = CGDisplayCurrentMode(kCGDirectMainDisplay);
-
-	CFNumberGetValue(
-		(const __CFNumber*)CFDictionaryGetValue(cur_mode, kCGDisplayWidth),
-		kCFNumberSInt32Type, &this->device_width
-	);
-
-	CFNumberGetValue(
-		(const __CFNumber*)CFDictionaryGetValue(cur_mode, kCGDisplayHeight),
-		kCFNumberSInt32Type, &this->device_height
-	);
-#	else
 	/* Use the new API when compiling for OSX 10.6 or later */
 	CGDisplayModeRef cur_mode = CGDisplayCopyDisplayMode(kCGDirectMainDisplay);
 	if (cur_mode == NULL) { return; }
@@ -217,7 +200,6 @@ void WindowQuartzSubdriver::GetDeviceInfo()
 	this->device_height = CGDisplayModeGetHeight(cur_mode);
 
 	CGDisplayModeRelease(cur_mode);
-#	endif
 }
 
 /** Switch to full screen mode on OSX 10.7
@@ -265,18 +247,11 @@ bool WindowQuartzSubdriver::SetVideoMode(int width, int height, int bpp)
 			return false;
 		}
 
-#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5
 		/* Add built in full-screen support when available (OS X 10.7 and higher)
 		 * This code actually compiles for 10.5 and later, but only makes sense in conjunction
 		 * with the quartz fullscreen support as found only in 10.7 and later
 		 */
 		if ([this->window respondsToSelector:@selector(toggleFullScreen:)]) {
-#if MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_7
-			/* Constants needed to build on pre-10.7 SDKs. Source: NSWindow documentation. */
-			const int NSWindowCollectionBehaviorFullScreenPrimary = 1 << 7;
-			const int NSWindowFullScreenButton = 7;
-#endif
-
 			NSWindowCollectionBehavior behavior = [ this->window collectionBehavior ];
 			behavior |= NSWindowCollectionBehaviorFullScreenPrimary;
 			[ this->window setCollectionBehavior:behavior ];
@@ -287,7 +262,6 @@ bool WindowQuartzSubdriver::SetVideoMode(int width, int height, int bpp)
 
 			[ this->window setCollectionBehavior: NSWindowCollectionBehaviorFullScreenPrimary ];
 		}
-#endif
 
 		[ this->window setDriver:this ];
 
@@ -303,10 +277,6 @@ bool WindowQuartzSubdriver::SetVideoMode(int width, int height, int bpp)
 		[ this->window setAcceptsMouseMovedEvents:YES ];
 		[ this->window setViewsNeedDisplay:NO ];
 
-#if MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_10
-		if ([ this->window respondsToSelector:@selector(useOptimizedDrawing:) ]) [ this->window useOptimizedDrawing:YES ];
-#endif
-
 		delegate = [ [ OTTD_CocoaWindowDelegate alloc ] init ];
 		[ delegate setDriver:this ];
 		[ this->window setDelegate:[ delegate autorelease ] ];
@@ -494,17 +464,8 @@ CGPoint WindowQuartzSubdriver::PrivateLocalToCG(NSPoint *p)
 
 	p->y = this->window_height - p->y;
 	*p = [ this->cocoaview convertPoint:*p toView:nil ];
+	*p = [ this->window convertRectToScreen:NSMakeRect(p->x, p->y, 0, 0) ].origin;
 
-#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_7
-	if ([ this->window respondsToSelector:@selector(convertRectToScreen:) ]) {
-		*p = [ this->window convertRectToScreen:NSMakeRect(p->x, p->y, 0, 0) ].origin;
-	} else
-#endif
-	{
-#if MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_7
-		*p = [ this->window convertBaseToScreen:*p ];
-#endif
-	}
 	p->y = this->device_height - p->y;
 
 	CGPoint cgp;
@@ -519,17 +480,7 @@ NSPoint WindowQuartzSubdriver::GetMouseLocation(NSEvent *event)
 	NSPoint pt;
 
 	if ( [ event window ] == nil) {
-#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_7
-		if ([ [ this->cocoaview window ] respondsToSelector:@selector(convertRectFromScreen:) ]) {
-			pt = [ this->cocoaview convertPoint:[ [ this->cocoaview window ] convertRectFromScreen:NSMakeRect([ event locationInWindow ].x, [ event locationInWindow ].y, 0, 0) ].origin fromView:nil ];
-		}
-		else
-#endif
-		{
-#if MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_7
-			pt = [ this->cocoaview convertPoint:[ [ this->cocoaview window ] convertScreenToBase:[ event locationInWindow ] ] fromView:nil ];
-#endif
-		}
+		pt = [ this->cocoaview convertPoint:[ [ this->cocoaview window ] convertRectFromScreen:NSMakeRect([ event locationInWindow ].x, [ event locationInWindow ].y, 0, 0) ].origin fromView:nil ];
 	} else {
 		pt = [ event locationInWindow ];
 	}
@@ -609,8 +560,8 @@ bool WindowQuartzSubdriver::WindowResized()
 
 CocoaSubdriver *QZ_CreateWindowQuartzSubdriver(int width, int height, int bpp)
 {
-	if (!MacOSVersionIsAtLeast(10, 4, 0)) {
-		DEBUG(driver, 0, "The cocoa quartz subdriver requires Mac OS X 10.4 or later.");
+	if (!MacOSVersionIsAtLeast(10, 7, 0)) {
+		DEBUG(driver, 0, "The cocoa quartz subdriver requires Mac OS X 10.7 or later.");
 		return NULL;
 	}
 
@@ -630,6 +581,5 @@ CocoaSubdriver *QZ_CreateWindowQuartzSubdriver(int width, int height, int bpp)
 }
 
 
-#endif /* MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_4 */
 #endif /* ENABLE_COCOA_QUARTZ */
 #endif /* WITH_COCOA */