diff --git a/common/JackAudioAdapterInterface.cpp b/common/JackAudioAdapterInterface.cpp
index f765d032..fed62e03 100644
--- a/common/JackAudioAdapterInterface.cpp
+++ b/common/JackAudioAdapterInterface.cpp
@@ -22,7 +22,7 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 #endif
 
 #include "JackAudioAdapter.h"
-#ifndef TARGET_OS_IPHONE
+#ifndef MY_TARGET_OS_IPHONE
 #include "JackLibSampleRateResampler.h"
 #endif
 #include "JackTime.h"  
@@ -194,7 +194,7 @@ namespace Jack
         fRunning = false;
     }
     
-#ifdef TARGET_OS_IPHONE
+#ifdef MY_TARGET_OS_IPHONE
     void JackAudioAdapterInterface::Create()
     {}
 #else
diff --git a/common/JackFilters.h b/common/JackFilters.h
index ad2afecc..ac9de9f9 100644
--- a/common/JackFilters.h
+++ b/common/JackFilters.h
@@ -25,7 +25,7 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 #endif
 
 #include "jack.h"
-#ifndef TARGET_OS_IPHONE
+#ifndef MY_TARGET_OS_IPHONE
 #include "JackAtomicState.h"
 #endif
 #include <math.h>
diff --git a/common/JackNetAPI.cpp b/common/JackNetAPI.cpp
index 185e0da6..d8833e09 100644
--- a/common/JackNetAPI.cpp
+++ b/common/JackNetAPI.cpp
@@ -877,7 +877,7 @@ SERVER_EXPORT int jack_adapter_pull_and_push(jack_adapter_t* adapter, float** in
 }
 
 
-#ifdef TARGET_OS_IPHONE
+#ifdef MY_TARGET_OS_IPHONE
 
 static void jack_format_and_log(int level, const char *prefix, const char *fmt, va_list ap)
 {
diff --git a/macosx/JackMachThread.cpp b/macosx/JackMachThread.cpp
index 9692bdb9..61b67b43 100644
--- a/macosx/JackMachThread.cpp
+++ b/macosx/JackMachThread.cpp
@@ -31,7 +31,7 @@ int JackMachThread::SetThreadToPriority(pthread_t thread, UInt32 inPriority, Boo
         // REAL-TIME / TIME-CONSTRAINT THREAD
         thread_time_constraint_policy_data_t	theTCPolicy;
 
-#ifdef TARGET_OS_IPHONE
+#ifdef MY_TARGET_OS_IPHONE
         theTCPolicy.period =  0;
         theTCPolicy.computation = 0;
         theTCPolicy.constraint =  0;
@@ -138,7 +138,7 @@ int JackMachThread::GetParams(pthread_t thread, UInt64* period, UInt64* computat
                                           &count,
                                           &get_default);
     if (res == KERN_SUCCESS) {
-    #ifdef TARGET_OS_IPHONE
+    #ifdef MY_TARGET_OS_IPHONE
         *period = 0;
         *computation = 0;
         *constraint = 0;
diff --git a/macosx/JackMachThread.h b/macosx/JackMachThread.h
index ac96f4a0..d25331d2 100644
--- a/macosx/JackMachThread.h
+++ b/macosx/JackMachThread.h
@@ -63,19 +63,19 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 
 #include <TargetConditionals.h>
 
-#ifdef TARGET_OS_IPHONE
+#ifdef MY_TARGET_OS_IPHONE
 typedef unsigned char Boolean;
 #endif
 
 
 #include "JackPosixThread.h"
-#ifndef TARGET_OS_IPHONE
+#ifndef MY_TARGET_OS_IPHONE
 #import <CoreServices/../Frameworks/CarbonCore.framework/Headers/MacTypes.h>
 #endif
 
 #include <mach/thread_policy.h>
 #include <mach/thread_act.h>
-#ifndef TARGET_OS_IPHONE
+#ifndef MY_TARGET_OS_IPHONE
 #include <CoreAudio/HostTime.h>
 #endif
 
diff --git a/macosx/JackPlatformPlug_os.h b/macosx/JackPlatformPlug_os.h
index df7f0175..d8cc1ca3 100644
--- a/macosx/JackPlatformPlug_os.h
+++ b/macosx/JackPlatformPlug_os.h
@@ -33,6 +33,13 @@ namespace Jack
 	class JackMachServerNotifyChannel;
 	class JackMachNotifyChannel;
 	class JackNetUnixSocket;
+    
+#ifdef MY_TARGET_OS_IPHONE
+    class JackClient;
+    class JackGraphManager;
+    class JackEngineControl;
+    class JackSynchro;    
+#endif 
 }
 
 /* __JackPlatformMutex__ */
@@ -44,7 +51,7 @@ namespace Jack { typedef JackPosixMutex JackMutex; }
 namespace Jack { typedef JackMachThread JackThread; }
 
 /* __JackPlatformSynchro__  client activation */
-#ifndef TARGET_OS_IPHONE
+#ifndef MY_TARGET_OS_IPHONE
 #include "JackMachSemaphore.h"
 namespace Jack { typedef JackMachSemaphore JackSynchro; }
 #endif
@@ -53,7 +60,7 @@ namespace Jack { typedef JackMachSemaphore JackSynchro; }
 #include "JackProcessSync.h"
 /* Only on windows a special JackProcessSync is used. It is directly defined by including JackProcessSync.h here */
 
-#ifndef TARGET_OS_IPHONE
+#ifndef MY_TARGET_OS_IPHONE
 /* __JackPlatformServerChannel__ */ 
 #include "JackMachServerChannel.h"
 namespace Jack { typedef JackMachServerChannel JackServerChannel; }
diff --git a/macosx/iphone/iPhoneNet.xcodeproj/project.pbxproj b/macosx/iphone/iPhoneNet.xcodeproj/project.pbxproj
index a1211fef..71611610 100755
--- a/macosx/iphone/iPhoneNet.xcodeproj/project.pbxproj
+++ b/macosx/iphone/iPhoneNet.xcodeproj/project.pbxproj
@@ -719,6 +719,7 @@
 				COPY_PHASE_STRIP = NO;
 				GCC_DYNAMIC_NO_PIC = NO;
 				GCC_OPTIMIZATION_LEVEL = 0;
+				GCC_PREFIX_HEADER = iPhoneNet_Prefix.pch;
 				HEADER_SEARCH_PATHS = (
 					../../common/jack,
 					../../common,
@@ -739,6 +740,13 @@
 				COPY_PHASE_STRIP = YES;
 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
 				GCC_ENABLE_FIX_AND_CONTINUE = NO;
+				GCC_PREFIX_HEADER = iPhoneNet_Prefix.pch;
+				HEADER_SEARCH_PATHS = (
+					../../macosx,
+					../../posix,
+					../../common,
+					../../common/jack,
+				);
 				PREBINDING = NO;
 				PRODUCT_NAME = jacknet;
 				ZERO_LINK = NO;
diff --git a/macosx/iphone/iPhoneNet_Prefix.pch b/macosx/iphone/iPhoneNet_Prefix.pch
index 8de611d5..55c63732 100644
--- a/macosx/iphone/iPhoneNet_Prefix.pch
+++ b/macosx/iphone/iPhoneNet_Prefix.pch
@@ -6,3 +6,5 @@
     #import <Foundation/Foundation.h>
     #import <UIKit/UIKit.h>
 #endif
+
+#define MY_TARGET_OS_IPHONE 1