diff --git a/src/frameworks/CoreServices/include/CarbonCore/Multiprocessing.h b/src/frameworks/CoreServices/include/CarbonCore/Multiprocessing.h
index 887718b80..50ef3d82d 100644
--- a/src/frameworks/CoreServices/include/CarbonCore/Multiprocessing.h
+++ b/src/frameworks/CoreServices/include/CarbonCore/Multiprocessing.h
@@ -14,6 +14,8 @@ enum {
 };
 
 typedef void* MPCriticalRegionID;
+typedef struct OpaqueMPSemaphoreID *MPSemaphoreID;
+typedef ItemCount MPSemaphoreCount;
 
 Boolean _MPIsFullyInitialized();
 OSStatus MPDelayUntil(AbsoluteTime* time);
@@ -23,7 +25,10 @@ OSStatus MPCreateCriticalRegion(MPCriticalRegionID* criticalRegion);
 OSStatus MPDeleteCriticalRegion(MPCriticalRegionID criticalRegion);
 OSStatus MPEnterCriticalRegion(MPCriticalRegionID criticalRegion, Duration timeout);
 OSStatus MPExitCriticalRegion(MPCriticalRegionID criticalRegion);
-
+OSStatus MPCreateSemaphore(MPSemaphoreCount maximumValue, MPSemaphoreCount initialValue, MPSemaphoreID *semaphore);
+OSStatus MPDeleteSemaphore(MPSemaphoreID semaphore);
+OSStatus MPSignalSemaphore(MPSemaphoreID semaphore);
+OSStatus MPWaitOnSemaphore(MPSemaphoreID semaphore, Duration timeout);
 // other functions are missing...
 
 #ifdef __cplusplus
diff --git a/src/frameworks/CoreServices/src/CarbonCore/Multiprocessing.cpp b/src/frameworks/CoreServices/src/CarbonCore/Multiprocessing.cpp
index a161ba3db..052775509 100644
--- a/src/frameworks/CoreServices/src/CarbonCore/Multiprocessing.cpp
+++ b/src/frameworks/CoreServices/src/CarbonCore/Multiprocessing.cpp
@@ -21,8 +21,15 @@ along with Darling.  If not, see <http://www.gnu.org/licenses/>.
 #include <unistd.h>
 #include <ctime>
 #include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
 #include <CarbonCore/MacErrors.h>
 
+static int verbose = 0;
+__attribute__((constructor)) static void initme(void) {
+    verbose = getenv("STUB_VERBOSE") != NULL;
+}
+
 Boolean _MPIsFullyInitialized()
 {
 	return true;
@@ -109,3 +116,27 @@ OSStatus MPExitCriticalRegion(MPCriticalRegionID criticalRegion)
 	else
 		return paramErr;
 }
+
+OSStatus MPCreateSemaphore(MPSemaphoreCount maximumValue, MPSemaphoreCount initialValue, MPSemaphoreID *semaphore)
+{
+    if (verbose) puts("STUB: MPCreateSemaphore called");
+    return noErr;
+}
+
+OSStatus MPDeleteSemaphore(MPSemaphoreID semaphore)
+{
+    if (verbose) puts("STUB: MPDeleteSemaphore called");
+    return noErr;
+}
+
+OSStatus MPSignalSemaphore(MPSemaphoreID semaphore)
+{
+    if (verbose) puts("STUB: MPSignalSemaphore called");
+    return noErr;
+}
+
+OSStatus MPWaitOnSemaphore(MPSemaphoreID semaphore, Duration timeout)
+{
+    if (verbose) puts("STUB: MPWaitOnSemaphore called");
+    return noErr;
+}
\ No newline at end of file