Ignore some of the includes. Commented out code. Only calculate offsets if __OBJC2__ is defined.

runtime/objc-cache.mm

@@ -83,7 +83,7 @@
 
 #include "objc-private.h"
 
-#if TARGET_OS_OSX
+#if TARGET_OS_OSX && !defined(DARLING)
 #include <Cambria/Traps.h>
 #include <Cambria/Cambria.h>
 #endif
@@ -1117,7 +1117,7 @@ static int _collecting_in_critical(void)
             continue;
 
         // Find out where thread is executing
-#if TARGET_OS_OSX
+#if TARGET_OS_OSX && !defined(DARLING)
         if (oah_is_current_process_translated()) {
             kern_return_t ret = objc_thread_get_rip(threads[count], (uint64_t*)&pc);
             if (ret != KERN_SUCCESS) {

runtime/objc-os.mm

@@ -28,7 +28,9 @@
 
 #include "objc-private.h"
 #include "objc-loadmethod.h"
+#ifndef DARLING
 #include "objc-bp-assist.h"
+#endif
 
 #if TARGET_OS_WIN32
 
@@ -661,11 +663,13 @@ static void static_init()
     for (size_t i = 0; i < count; i++) {
         inits[i]();
     }
+    #if __OBJC2__
     auto offsets = getLibobjcInitializerOffsets(&_mh_dylib_header, &count);
     for (size_t i = 0; i < count; i++) {
         UnsignedInitializer init(offsets[i]);
         init();
     }
+    #endif
 }