diff --git a/gtk2_ardour/fix_carbon.h b/gtk2_ardour/fix_carbon.h
index 5c1922ed0d..b77543da18 100644
--- a/gtk2_ardour/fix_carbon.h
+++ b/gtk2_ardour/fix_carbon.h
@@ -25,7 +25,7 @@
 /* an awful hack to stop Carbon #defines from messing with other code
  */
 
-#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1090
+#ifdef CARBON_FLAT_HEADERS
     #include "MacTypes.h"
 #else
     #include "/System/Library/Frameworks/CoreServices.framework/Headers/../Frameworks/CarbonCore.framework/Headers/MacTypes.h"
diff --git a/libs/appleutility/CAConditionalMacros.h b/libs/appleutility/CAConditionalMacros.h
index 091cf4d278..09fa8d1b2f 100644
--- a/libs/appleutility/CAConditionalMacros.h
+++ b/libs/appleutility/CAConditionalMacros.h
@@ -55,7 +55,7 @@
 #include "TargetConditionals.h"
 
 //	Determine whether or not to use framework style includes for system headers
-#if !defined(CoreAudio_Use_Framework_Includes) && !defined(__COREAUDIO_USE_FLAT_INCLUDES__)
+#if !defined(CoreAudio_Use_Framework_Includes) && !defined(__COREAUDIO_USE_FLAT_INCLUDES__) && !defined (CARBON_FLAT_HEADERS)
 	#if	TARGET_RT_MAC_MACHO
 		#define	CoreAudio_Use_Framework_Includes	1
 	#else
@@ -65,7 +65,7 @@
 
 //	Include the regular ConditionalMacros.h too, since it has useful stuff that
 //	TargetConditionals.h lacks for some reason.
-#if	CoreAudio_Use_Framework_Includes && (MAC_OS_X_VERSION_MIN_REQUIRED >= 1090)
+#if	CoreAudio_Use_Framework_Includes
 	#include "ConditionalMacros.h"
 #else
 	#include <CoreServices/../Frameworks/CarbonCore.framework/Headers/ConditionalMacros.h>
diff --git a/wscript b/wscript
index a9c5990527..5a49f3a38b 100755
--- a/wscript
+++ b/wscript
@@ -210,7 +210,9 @@ def set_compiler_flags (conf,opt):
         conf.env['build_target'] = opt.dist_target
 
     if conf.env['build_target'] == 'mavericks':
-        cxx_flags.append('-stdlib=libc++')
+            # Mavericks and later changed the syntax to be used when including Carbon headers,
+            # from requiring a full path to requiring just the header name.
+            cxx_flags.append('-DCARBON_FLAT_HEADERS')
 
     if conf.env['build_target'] == 'snowleopard':
         #