diff --git a/extensions/CMakeLists.txt b/extensions/CMakeLists.txt
index ee876efeef..54db16213d 100644
--- a/extensions/CMakeLists.txt
+++ b/extensions/CMakeLists.txt
@@ -23,7 +23,9 @@ if(CMAKE_COMPILER_IS_GNUCXX)
 	SET(CMAKE_CXX_FLAGS "-std=c++11 -march=i686 -m32 -O2 -s -fPIC -fpermissive")
 	set(CMAKE_FIND_LIBRARY_SUFFIXES ".a")
 	set(CMAKE_SHARED_LINKER_FLAGS "-static-libgcc -static-libstdc++")
-else()
+elseif (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
+    message(ERROR "SUPPORT NOT COMPLETE")
+elseif (CMAKE_CXX_COMPILER_ID MATCHES "MSVC")
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /Wall /arch:SSE2 /Qpar-report:2")
 	set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS} /D _DEBUG /MTd /Zi /Ob0 /Od /RTC1")
 	set(CMAKE_CXX_FLAGS_MINSIZEREL     "${CMAKE_CXX_FLAGS} /MT /O1 /Ob1 /D NDEBUG")
diff --git a/extensions/advanced_ballistics/AdvancedBallistics.cpp b/extensions/advanced_ballistics/AdvancedBallistics.cpp
index 7e87592e00..48865f7f6b 100644
--- a/extensions/advanced_ballistics/AdvancedBallistics.cpp
+++ b/extensions/advanced_ballistics/AdvancedBallistics.cpp
@@ -238,7 +238,7 @@ void __stdcall RVExtension(char *output, int outputSize, const char *function)
     ZERO_OUTPUT();
 
     if (!strcmp(function, "version")) {
-        int n = sprintf_s(output, outputSize, "%s", ACE_FULL_VERSION_STR);
+        int n = sprintf(output,  "%s", ACE_FULL_VERSION_STR);
         EXTENSION_RETURN();
     }
 
@@ -258,7 +258,7 @@ void __stdcall RVExtension(char *output, int outputSize, const char *function)
         velocity = strtod(strtok_s(NULL, ":", &next_token), NULL);
 
         retard = calculateRetard(dragModel, ballisticCoefficient, velocity);
-        int n = sprintf_s(output, outputSize, "%f", retard);
+        int n = sprintf(output,  "%f", retard);
         EXTENSION_RETURN();
     } else if (!strcmp(mode, "atmosphericCorrection")) {
         double ballisticCoefficient = 1.0;
@@ -274,7 +274,7 @@ void __stdcall RVExtension(char *output, int outputSize, const char *function)
         atmosphereModel = strtok_s(NULL, ":", &next_token);
 
         ballisticCoefficient = calculateAtmosphericCorrection(ballisticCoefficient, temperature, pressure, humidity, atmosphereModel);
-        int n = sprintf_s(output, outputSize, "%f", ballisticCoefficient);
+        int n = sprintf(output,  "%f", ballisticCoefficient);
         EXTENSION_RETURN();
     } else if (!strcmp(mode, "new")) {
         unsigned int index = 0;
@@ -369,7 +369,7 @@ void __stdcall RVExtension(char *output, int outputSize, const char *function)
         bulletDatabase[index].frames = 0.0;
         bulletDatabase[index].randSeed = 0;
 
-        int n = sprintf_s(output, outputSize, "%s", "");
+        int n = sprintf(output,  "%s", "");
         EXTENSION_RETURN();
     } else if (!strcmp(mode, "simulate")) {
         // simulate:0:[-0.109985,542.529,-3.98301]:[3751.57,5332.23,214.252]:[0.598153,2.38829,0]:28.6:0:0.481542:0:215.16
@@ -586,7 +586,7 @@ void __stdcall RVExtension(char *output, int outputSize, const char *function)
             velocityOffset[2] += (distribution(bulletDatabase[index].randGenerator) * 0.8 - 0.4) * coef;
         };
 
-        int n = sprintf_s(output, outputSize, "_bullet setVelocity (_bulletVelocity vectorAdd [%f, %f, %f]); _bullet setPosASL (_bulletPosition vectorAdd [%f, %f, %f]);", velocityOffset[0], velocityOffset[1], velocityOffset[2], positionOffset[0], positionOffset[1], positionOffset[2]);
+        int n = sprintf(output,  "_bullet setVelocity (_bulletVelocity vectorAdd [%f, %f, %f]); _bullet setPosASL (_bulletPosition vectorAdd [%f, %f, %f]);", velocityOffset[0], velocityOffset[1], velocityOffset[2], positionOffset[0], positionOffset[1], positionOffset[2]);
         EXTENSION_RETURN();
     } else if (!strcmp(mode, "set")) {
         int height = 0;
@@ -601,7 +601,7 @@ void __stdcall RVExtension(char *output, int outputSize, const char *function)
         map->gridBuildingNums.push_back(numObjects);
         map->gridSurfaceIsWater.push_back(surfaceIsWater);
 
-        int n = sprintf_s(output, outputSize, "%s", "");
+        int n = sprintf(output,  "%s", "");
         EXTENSION_RETURN();
     } else if (!strcmp(mode, "init")) {
         int mapSize = 0;
@@ -616,7 +616,7 @@ void __stdcall RVExtension(char *output, int outputSize, const char *function)
 
         map = &mapDatabase[worldName];
         if (map->gridHeights.size() == gridCells) {
-            int n = sprintf_s(output, outputSize, "%s", "Terrain already initialized");
+            int n = sprintf(output, "%s", "Terrain already initialized");
             EXTENSION_RETURN();
         }
 
@@ -629,10 +629,10 @@ void __stdcall RVExtension(char *output, int outputSize, const char *function)
         map->gridBuildingNums.reserve(gridCells);
         map->gridSurfaceIsWater.reserve(gridCells);
 
-        int n = sprintf_s(output, outputSize, "%s", "");
+        int n = sprintf(output, "%s", "");
         EXTENSION_RETURN();
     }
 
-    int n = sprintf_s(output, outputSize, "%s", "");
+    int n = sprintf(output, "%s", "");
     EXTENSION_RETURN();
 }