Consider this transplanted.

Plus, default should be the left-most branch in graphical viewing.

src/archutils/Darwin/arch_setup.h

@@ -25,17 +25,10 @@ extern "C" int SM_main( int argc, char *argv[] );
 // CGFlushDrawable() performs a glFlush() and the docs say not to call glFlush()
 #define NO_GL_FLUSH
 
-#if defined(__ppc__)
-# define CPU_PPC
-# define ENDIAN_BIG
-# define BACKTRACE_LOOKUP_METHOD_DARWIN_DYLD
-# define BACKTRACE_METHOD_POWERPC_DARWIN
-#elif defined(__i386__)
-# define CPU_X86
-# define ENDIAN_LITTLE
-# define BACKTRACE_METHOD_X86_DARWIN
-# define BACKTRACE_LOOKUP_METHOD_DLADDR
-#endif
+#define CPU_X86
+#define ENDIAN_LITTLE
+#define BACKTRACE_METHOD_X86_DARWIN
+#define BACKTRACE_LOOKUP_METHOD_DLADDR
 
 #ifndef MACOSX
 # define MACOSX