diff --git a/src/tools/accc/ac3dgroup.cpp b/src/tools/accc/ac3dgroup.cpp
index 2b6ad7ff7..e1967ef87 100644
--- a/src/tools/accc/ac3dgroup.cpp
+++ b/src/tools/accc/ac3dgroup.cpp
@@ -38,7 +38,7 @@ extern mat_t * root_material;
 extern void smoothTriNorm(ob_t * object);
 void reorder(ob_t * ob, ob_t * ob2, double *textarray, tcoord_t *vertexarray);
 void collapseTextures(ob_t * ob0, ob_t * ob1, ob_t * ob2, ob_t * ob3);
-void loadAndGroup(char *OutputFileName)
+void loadAndGroup(const char *OutputFileName)
 {
     ob_t * ob0 = NULL;
     ob_t * ob1 = NULL;
diff --git a/src/tools/accc/ac3dload.cpp b/src/tools/accc/ac3dload.cpp
index f22f1e44f..06815befd 100644
--- a/src/tools/accc/ac3dload.cpp
+++ b/src/tools/accc/ac3dload.cpp
@@ -288,12 +288,12 @@ int doRefs(char *Line, ob_t *object, mat_t *material);
 int doCrease(char *Line, ob_t *object, mat_t *material);
 
 #ifdef _3DS
-void saveObin3DS( char * OutputFilename, ob_t * object);
+void saveObin3DS(const char * OutputFilename, ob_t * object);
 #endif
-void computeSaveAC3D(char * OutputFilename, ob_t * object);
-void computeSaveOBJ(char * OutputFilename, ob_t * object);
-void computeSaveAC3DM(char * OutputFilename, ob_t * object);
-void computeSaveAC3DStrip(char * OutputFilename, ob_t * object);
+void computeSaveAC3D(const char * OutputFilename, ob_t * object);
+void computeSaveOBJ(const char * OutputFilename, ob_t * object);
+void computeSaveAC3DM(const char * OutputFilename, ob_t * object);
+void computeSaveAC3DStrip(const char * OutputFilename, ob_t * object);
 void stripifyOb(ob_t * object, int writeit);
 
 verbaction_t verbTab[] =
@@ -1462,7 +1462,7 @@ ob_t * splitObjects(ob_t* object)
     return newob;
 }
 
-int loadAC(char * inputFilename, char * outputFilename)
+int loadAC(const char * inputFilename, const char * outputFilename)
 {
     /* saveIn : 0= 3ds , 1= obj , 2=ac3d grouped (track) , 3 = ac3d strips (cars) */
     char Line[256];
@@ -2670,7 +2670,7 @@ void smoothObjectTriNorm(ob_t * object)
     return;
 }
 
-void computeSaveAC3D(char * OutputFilename, ob_t * object)
+void computeSaveAC3D(const char * OutputFilename, ob_t * object)
 {
 
     int i = 0;
@@ -3020,7 +3020,7 @@ void computeSaveAC3D(char * OutputFilename, ob_t * object)
     fclose(ofile);
 }
 
-void computeSaveOBJ(char * OutputFilename, ob_t * object)
+void computeSaveOBJ(const char * OutputFilename, ob_t * object)
 {
 
     int i = 0;
@@ -3690,7 +3690,7 @@ void stripifyOb(ob_t * object, int writeit)
     }
 }
 
-void computeSaveAC3DM(char * OutputFilename, ob_t * object)
+void computeSaveAC3DM(const char * OutputFilename, ob_t * object)
 {
 
     int i = 0;
@@ -4487,7 +4487,7 @@ void normalMap01(ob_t * object)
     }
 }
 
-void computeSaveAC3DStrip(char * OutputFilename, ob_t * object)
+void computeSaveAC3DStrip(const char * OutputFilename, ob_t * object)
 
 {
 
diff --git a/src/tools/accc/accc.h b/src/tools/accc/accc.h
index c53780998..52089e548 100644
--- a/src/tools/accc/accc.h
+++ b/src/tools/accc/accc.h
@@ -28,8 +28,6 @@
 #define FALSE 0
 #define TRUE 1
 
-extern char *OutputFileName;
-extern char *ReliefFileName;
 extern char * fileL0;
 extern char * fileL1;
 extern char * fileL2;
@@ -47,14 +45,14 @@ extern int normalMapping;
 extern char *OrderString;
 extern int collapseObject;
 
-extern void loadAndGroup(char *OutputFileName);
+extern void loadAndGroup(const char *OutputFileName);
 /** Loads the file with inputFilename to the global root_ob and root_material
  *  variables and optionally outputs the loaded object to outputFilename
  *  based on the current value of the global typeConvertion variable.
  *
  *  @returns 0 on success, a value != 0 on failure
  */
-int loadAC(char * inputFilename, char * outputFilename = NULL);
+int loadAC(const char * inputFilename, const char * outputFilename = NULL);
 
 #define _AC3DTO3DS 1
 #define _3DSTOAC3D 2
diff --git a/src/tools/accc/mainaccc.cpp b/src/tools/accc/mainaccc.cpp
index 78f8c6900..10ec31de1 100644
--- a/src/tools/accc/mainaccc.cpp
+++ b/src/tools/accc/mainaccc.cpp
@@ -35,8 +35,8 @@
 /* -g  g-track-2.ac -l0 g2.ac -d3 200900 -d2 200 -d1 100 -S 200 >t */
 /* +es 80 p-gt1.ac porsche-gt1.ac>t */
 int distSplit = 0;
-char *InputFileName = NULL;
-char *OutputFileName = NULL;
+static char *InputFileName = NULL;
+static char *OutputFileName = NULL;
 char * fileL0 = NULL;
 char * fileL1 = NULL;
 char * fileL2 = NULL;
@@ -343,7 +343,7 @@ int main(int argc, char **argv)
 
     init_args(argc, argv);
 #ifdef _3DS
-    extern int load3ds( char * inputFilename, char * outputFilename);
+    extern int load3ds(const char * inputFilename, const char * outputFilename);
 #endif
 
     if (typeConvertion == _AC3DTOAC3DGROUP)
@@ -353,7 +353,7 @@ int main(int argc, char **argv)
 #ifdef _3DS
     else if (typeConvertion == _3DSTOAC3D)
     {
-        load3ds( InputFileName, OutputFileName);
+        load3ds(InputFileName, OutputFileName);
     }
 #endif
     else