diff --git a/freeglut/freeglut/src/freeglut_callbacks.c b/freeglut/freeglut/src/freeglut_callbacks.c
index ef404f7..90baf10 100644
--- a/freeglut/freeglut/src/freeglut_callbacks.c
+++ b/freeglut/freeglut/src/freeglut_callbacks.c
@@ -106,7 +106,7 @@ void FGAPIENTRY glutTimerFunc( unsigned int timeOut, void (* callback)( int ), i
     /*
      * Create a new freeglut timer hook structure
      */
-    timer = calloc( sizeof(SFG_Timer), 1 );
+    timer = (SFG_Timer *)calloc( sizeof(SFG_Timer), 1 );
 
     /*
      * Remember the callback address and timer hook's ID
diff --git a/freeglut/freeglut/src/freeglut_geometry.c b/freeglut/freeglut/src/freeglut_geometry.c
index 23ba7d6..81065a6 100644
--- a/freeglut/freeglut/src/freeglut_geometry.c
+++ b/freeglut/freeglut/src/freeglut_geometry.c
@@ -129,7 +129,7 @@ void FGAPIENTRY glutWireSphere( GLdouble dRadius, GLint slices, GLint stacks )
     /*
      * Allocate the vertices array
      */
-    vertex = calloc( sizeof(double), 3 * slices * (stacks - 1) );
+    vertex = (double *)calloc( sizeof(double), 3 * slices * (stacks - 1) );
 
     glPushMatrix();
     glScaled( radius, radius, radius );
@@ -207,8 +207,8 @@ void FGAPIENTRY glutSolidSphere( GLdouble dRadius, GLint slices, GLint stacks )
     glPushMatrix();
     /* glScalef( radius, radius, radius ); */
 
-    row  = calloc( sizeof(double), slices * 3 );
-    next = calloc( sizeof(double), slices * 3 );
+    row  = (double *)calloc( sizeof(double), slices * 3 );
+    next = (double *)calloc( sizeof(double), slices * 3 );
 
     dpsi = M_PI / (stacks + 1);
     dphi = 2 * M_PI / slices;
@@ -329,7 +329,7 @@ void FGAPIENTRY glutWireCone( GLdouble base, GLdouble height, GLint slices, GLin
   /*
    * We need 'slices' points on a circle
    */
-  vertices = calloc( sizeof(double), 2 * (slices + 1) );
+  vertices = (double *)calloc( sizeof(double), 2 * (slices + 1) );
 
   for( j=0; j<slices+1; j++ )
   {
@@ -415,7 +415,7 @@ void FGAPIENTRY glutSolidCone( GLdouble base, GLdouble height, GLint slices, GLi
   /*
    * We need 'slices' points on a circle
    */
-  vertices = calloc( sizeof(double), 2 * (slices + 1) );
+  vertices = (double *)calloc( sizeof(double), 2 * (slices + 1) );
 
   for( j=0; j<slices+1; j++ )
   {
@@ -498,8 +498,8 @@ void FGAPIENTRY glutWireTorus( GLdouble dInnerRadius, GLdouble dOuterRadius, GLi
   /*
    * Allocate the vertices array
    */
-  vertex = calloc( sizeof(double), 3 * nSides * nRings );
-  normal = calloc( sizeof(double), 3 * nSides * nRings );
+  vertex = (double *)calloc( sizeof(double), 3 * nSides * nRings );
+  normal = (double *)calloc( sizeof(double), 3 * nSides * nRings );
 
   glPushMatrix();
 
@@ -582,8 +582,8 @@ void FGAPIENTRY glutSolidTorus( GLdouble dInnerRadius, GLdouble dOuterRadius, GL
   /*
    * Allocate the vertices array
    */
-  vertex = calloc( sizeof(double), 3 * nSides * nRings );
-  normal = calloc( sizeof(double), 3 * nSides * nRings );
+  vertex = (double *)calloc( sizeof(double), 3 * nSides * nRings );
+  normal = (double *)calloc( sizeof(double), 3 * nSides * nRings );
 
   glPushMatrix();
 
diff --git a/freeglut/freeglut/src/freeglut_init.c b/freeglut/freeglut/src/freeglut_init.c
index ab6a1d2..16e8026 100644
--- a/freeglut/freeglut/src/freeglut_init.c
+++ b/freeglut/freeglut/src/freeglut_init.c
@@ -287,7 +287,7 @@ void fgDeinitialize( void )
     /*
      * Delete all the timers and their storage list
      */
-    while ( (timer = fgState.Timers.First) != NULL )
+    while ( (timer = (SFG_Timer *)fgState.Timers.First) != NULL )
     {
       fgListRemove ( &fgState.Timers, &timer->Node ) ;
       free ( timer ) ;
@@ -985,7 +985,7 @@ void FGAPIENTRY glutInitDisplayString( const char* displayMode )
    */
   char *token ;
   int len = strlen ( displayMode ) ;
-  char *buffer = malloc ( (len+1) * sizeof(char) ) ;
+  char *buffer = (char *)malloc ( (len+1) * sizeof(char) ) ;
   memcpy ( buffer, displayMode, len ) ;
   buffer[len] = '\0' ;
 
diff --git a/freeglut/freeglut/src/freeglut_joystick.c b/freeglut/freeglut/src/freeglut_joystick.c
index a47d491..378e408 100644
--- a/freeglut/freeglut/src/freeglut_joystick.c
+++ b/freeglut/freeglut/src/freeglut_joystick.c
@@ -501,7 +501,7 @@ void fgJoystickInit( int ident )
     /*
      * Have the global joystick structure created
      */
-    fgJoystick = calloc( sizeof(SFG_Joystick), 1 );
+    fgJoystick = (SFG_Joystick *)calloc( sizeof(SFG_Joystick), 1 );
 
 #ifdef WIN32
     switch( ident )
diff --git a/freeglut/freeglut/src/freeglut_main.c b/freeglut/freeglut/src/freeglut_main.c
index 4df16bf..423e23a 100644
--- a/freeglut/freeglut/src/freeglut_main.c
+++ b/freeglut/freeglut/src/freeglut_main.c
@@ -301,9 +301,9 @@ static void fghCheckTimers( void )
     /*
      * For every timer that is waiting for triggering
      */
-    for( timer = fgState.Timers.First; timer; timer = next )
+    for( timer = (SFG_Timer *)fgState.Timers.First; timer; timer = next )
     {
-	next = timer->Node.Next;
+	next = (SFG_Timer *)timer->Node.Next;
 
         /*
          * Check for the timeout:
@@ -322,7 +322,7 @@ static void fghCheckTimers( void )
      * Now feel free to execute all the hooked and timed out timer callbacks
      * And delete the timed out timers...
      */
-    while ( (timer = timedOut.First) )
+    while ( (timer = (SFG_Timer *)timedOut.First) )
     {
         if( timer->Callback != NULL )
             timer->Callback( timer->ID );
@@ -394,13 +394,13 @@ static void fgCleanUpGlutsMess( void )
 
   if ( fgStructure.Windows.First != NULL ) 
   {
-    SFG_Window *win = fgStructure.Windows.First ;
+    SFG_Window *win = (SFG_Window *)fgStructure.Windows.First ;
     glEnd();
     glFinish();
     glFlush();
     while ( win != NULL )
     {
-      SFG_Window *temp_win = win->Node.Next ;
+      SFG_Window *temp_win = (SFG_Window *)win->Node.Next ;
       fgDestroyWindow ( win, FALSE ) ;
       win = temp_win ;
     }
@@ -1076,7 +1076,7 @@ void FGAPIENTRY glutMainLoopEvent( void )
 void FGAPIENTRY glutMainLoop( void )
 {
 #if TARGET_HOST_WIN32
-  SFG_Window *window = fgStructure.Windows.First ;
+  SFG_Window *window = (SFG_Window *)fgStructure.Windows.First ;
 #endif
 
   /*
@@ -1098,7 +1098,7 @@ void FGAPIENTRY glutMainLoop( void )
     if ( window->Callbacks.Visibility != NULL )
       window->Callbacks.Visibility ( window->State.Visible ) ;
 
-    window = window->Node.Next ;
+    window = (SFG_Window *)window->Node.Next ;
   }
 #endif
 
@@ -1343,7 +1343,7 @@ LRESULT CALLBACK fgWindowProc( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lPara
             /* Step through the list of windows.  If the rendering context is notbeing used
              * by another window, then we delete it.
              */
-            for ( iter = fgStructure.Windows.First; iter; iter = iter->Node.Next )
+            for ( iter = (SFG_Window *)fgStructure.Windows.First; iter; iter = (SFG_Window *)iter->Node.Next )
             {
               if ( ( iter->Window.Context == window->Window.Context ) && ( iter != window ) )
                 used = TRUE ;
diff --git a/freeglut/freeglut/src/freeglut_menu.c b/freeglut/freeglut/src/freeglut_menu.c
index d7ee2ac..9054cce 100644
--- a/freeglut/freeglut/src/freeglut_menu.c
+++ b/freeglut/freeglut/src/freeglut_menu.c
@@ -62,7 +62,7 @@ static SFG_MenuEntry *fghFindMenuEntry( SFG_Menu* menu, int index )
     SFG_MenuEntry *entry;
     int i = 1;
 
-    for( entry = menu->Entries.First; entry; entry = entry->Node.Next)
+    for( entry = (SFG_MenuEntry *)menu->Entries.First; entry; entry = (SFG_MenuEntry *)entry->Node.Next)
     {
         if (i == index)
             break;
@@ -83,8 +83,8 @@ static GLboolean fghCheckMenuStatus( SFG_Window* window, SFG_Menu* menu )
   /*
    * First of all check any of the active sub menus...
    */
-  for( menuEntry = menu->Entries.First; menuEntry;
-       menuEntry = menuEntry->Node.Next )
+  for( menuEntry = (SFG_MenuEntry *)menu->Entries.First; menuEntry;
+       menuEntry = (SFG_MenuEntry *)menuEntry->Node.Next )
   {
     /*
      * Is that an active sub menu by any case?
@@ -117,8 +117,8 @@ static GLboolean fghCheckMenuStatus( SFG_Window* window, SFG_Menu* menu )
   /*
    * Mark all menu entries inactive...
    */
-  for( menuEntry = menu->Entries.First; menuEntry;
-       menuEntry = menuEntry->Node.Next )
+  for( menuEntry = (SFG_MenuEntry *)menu->Entries.First; menuEntry;
+       menuEntry = (SFG_MenuEntry *)menuEntry->Node.Next )
   {
     menuEntry->IsActive = FALSE;
   }
@@ -255,8 +255,8 @@ static void fghDisplayMenuBox( SFG_Menu* menu )
   /*
    * Check if any of the submenus is currently active...
    */
-  for( menuEntry = menu->Entries.First; menuEntry;
-       menuEntry = menuEntry->Node.Next )
+  for( menuEntry = (SFG_MenuEntry *)menu->Entries.First; menuEntry;
+       menuEntry = (SFG_MenuEntry *)menuEntry->Node.Next )
   {
     /*
      * Has the menu been marked as active, maybe?
@@ -288,8 +288,8 @@ static void fghDisplayMenuBox( SFG_Menu* menu )
    */
   glColor4f( 1, 1, 1, 1 );
 
-  for( menuEntry = menu->Entries.First, i=0; menuEntry;
-       menuEntry = menuEntry->Node.Next, ++i )
+  for( menuEntry = (SFG_MenuEntry *)menu->Entries.First, i=0; menuEntry;
+       menuEntry = (SFG_MenuEntry *)menuEntry->Node.Next, ++i )
   {
     /*
      * Move the raster into position...
@@ -334,8 +334,8 @@ static void fghDisplayMenuBox( SFG_Menu* menu )
   /*
    * Now we are ready to check if any of our children needs to be redrawn:
    */
-  for( menuEntry = menu->Entries.First; menuEntry;
-       menuEntry = menuEntry->Node.Next )
+  for( menuEntry = (SFG_MenuEntry *)menu->Entries.First; menuEntry;
+       menuEntry = (SFG_MenuEntry *)menuEntry->Node.Next )
   {
     /*
      * Is that an active sub menu by any case?
@@ -361,7 +361,7 @@ static void fghSetSubmenuParentWindow ( SFG_Window *window, SFG_Menu *menu )
 
   menu->ParentWindow = window ;
 
-  for ( menuEntry = menu->Entries.First; menuEntry; menuEntry = menuEntry->Node.Next )
+  for ( menuEntry = (SFG_MenuEntry *)menu->Entries.First; menuEntry; menuEntry = (SFG_MenuEntry *)menuEntry->Node.Next )
   {
     if ( menuEntry->SubMenu != NULL )
       fghSetSubmenuParentWindow ( window, menuEntry->SubMenu ) ;
@@ -514,7 +514,7 @@ void fgExecuteMenuCallback( SFG_Menu* menu )
   /*
    * First of all check any of the active sub menus...
    */
-  for( menuEntry = menu->Entries.First; menuEntry; menuEntry = menuEntry->Node.Next)
+  for( menuEntry = (SFG_MenuEntry *)menu->Entries.First; menuEntry; menuEntry = (SFG_MenuEntry *)menuEntry->Node.Next)
   {
     /*
      * Is this menu entry active?
@@ -584,8 +584,8 @@ void fgDeactivateMenu( SFG_Window *window )
     /*
      * Hide all submenu windows, and the root menu's window.
      */
-    for ( menuEntry = menu->Entries.First; menuEntry;
-          menuEntry = menuEntry->Node.Next )
+    for ( menuEntry = (SFG_MenuEntry *)menu->Entries.First; menuEntry;
+          menuEntry = (SFG_MenuEntry *)menuEntry->Node.Next )
     {
       /*
        * Is that an active submenu by any case?
@@ -619,8 +619,8 @@ void fgDeactivateSubMenu( SFG_MenuEntry *menuEntry )
     /*
      * Hide all submenu windows, and the root menu's window.
      */
-    for ( subMenuIter = menuEntry->SubMenu->Entries.First; subMenuIter;
-          subMenuIter = subMenuIter->Node.Next )
+    for ( subMenuIter = (SFG_MenuEntry *)menuEntry->SubMenu->Entries.First; subMenuIter;
+          subMenuIter = (SFG_MenuEntry *)subMenuIter->Node.Next )
     {
       /*
        * Is that an active submenu by any case?
@@ -648,8 +648,8 @@ void fghCalculateMenuBoxSize( void )
   /*
    * The menu's box size depends on the menu entries:
    */
-  for( menuEntry = fgStructure.Menu->Entries.First; menuEntry;
-       menuEntry = menuEntry->Node.Next)
+  for( menuEntry = (SFG_MenuEntry *)fgStructure.Menu->Entries.First; menuEntry;
+       menuEntry = (SFG_MenuEntry *)menuEntry->Node.Next)
   {
     /*
      * Update the menu entry's width value
@@ -752,7 +752,7 @@ void FGAPIENTRY glutSetMenu( int menuID )
  */
 void FGAPIENTRY glutAddMenuEntry( const char* label, int value )
 {
-    SFG_MenuEntry* menuEntry = calloc( sizeof(SFG_MenuEntry), 1 );
+    SFG_MenuEntry* menuEntry = (SFG_MenuEntry *)calloc( sizeof(SFG_MenuEntry), 1 );
 
     /*
      * Make sure there is a current menu set
@@ -781,7 +781,7 @@ void FGAPIENTRY glutAddMenuEntry( const char* label, int value )
  */
 void FGAPIENTRY glutAddSubMenu( const char* label, int subMenuID )
 {
-  SFG_MenuEntry* menuEntry = calloc( sizeof(SFG_MenuEntry), 1 );
+  SFG_MenuEntry* menuEntry = (SFG_MenuEntry *)calloc( sizeof(SFG_MenuEntry), 1 );
   SFG_Menu*      subMenu = fgMenuByID( subMenuID );
 
   /*
diff --git a/freeglut/freeglut/src/freeglut_structure.c b/freeglut/freeglut/src/freeglut_structure.c
index 9945e99..da29757 100644
--- a/freeglut/freeglut/src/freeglut_structure.c
+++ b/freeglut/freeglut/src/freeglut_structure.c
@@ -65,7 +65,7 @@ SFG_Window* fgCreateWindow( SFG_Window* parent, const char* title, int x, int y,
     /*
      * Have the window object created
      */
-    SFG_Window* window = calloc( sizeof(SFG_Window), 1 );
+    SFG_Window *window = (SFG_Window *)calloc( sizeof(SFG_Window), 1 );
     int fakeArgc = 0;
 
     /*
@@ -138,7 +138,7 @@ SFG_Menu* fgCreateMenu( FGCBmenu menuCallback )
     /*
      * Have the menu object created
      */
-    SFG_Menu* menu = calloc( sizeof(SFG_Menu), 1 );
+    SFG_Menu* menu = (SFG_Menu *)calloc( sizeof(SFG_Menu), 1 );
     int fakeArgc = 0;
 
     /*
@@ -280,7 +280,7 @@ void fgDestroyWindow( SFG_Window* window, GLboolean needToClose )
     /*
      * Does this window have any subwindows?
      */
-    while ( (subWindow = window->Children.First) != NULL )
+    while ( (subWindow = (SFG_Window *)window->Children.First) != NULL )
     {
         /*
          * Destroy the first window in the list (possibly destroying
@@ -345,8 +345,8 @@ static void fghRemoveMenuFromWindow( SFG_Window* window, SFG_Menu* menu )
     /*
      * Call this function for all of the window's children recursively:
      */
-    for( subWindow = window->Children.First; subWindow;
-         subWindow = subWindow->Node.Next)
+    for( subWindow = (SFG_Window *)window->Children.First; subWindow;
+         subWindow = (SFG_Window *)subWindow->Node.Next)
     {
         fghRemoveMenuFromWindow( subWindow, menu );
     }
@@ -360,7 +360,7 @@ static void fghRemoveMenuFromMenu( SFG_Menu* from, SFG_Menu* menu )
 {
   SFG_MenuEntry *entry;
 
-  for( entry = from->Entries.First; entry; entry = entry->Node.Next )
+  for( entry = (SFG_MenuEntry *)from->Entries.First; entry; entry = (SFG_MenuEntry *)entry->Node.Next )
   {
     if (entry->SubMenu == menu)
     {
@@ -385,7 +385,7 @@ void fgDestroyMenu( SFG_Menu* menu )
   /*
    * First of all, have all references to this menu removed from all windows:
    */
-  for( window = fgStructure.Windows.First; window; window = window->Node.Next )
+  for( window = (SFG_Window *)fgStructure.Windows.First; window; window = (SFG_Window *)window->Node.Next )
   {
     fghRemoveMenuFromWindow( window, menu );
   }
@@ -393,7 +393,7 @@ void fgDestroyMenu( SFG_Menu* menu )
   /*
    * Now proceed with removing menu entries that lead to this menu
    */
-  for( from = fgStructure.Menus.First; from; from = from->Node.Next )
+  for( from = (SFG_Menu *)fgStructure.Menus.First; from; from = (SFG_Menu *)from->Node.Next )
   {
     fghRemoveMenuFromMenu( from, menu );
   }
@@ -414,7 +414,7 @@ void fgDestroyMenu( SFG_Menu* menu )
    * Now we are pretty sure the menu is not used anywhere
    * and that we can remove all of its entries
    */
-  while( (entry = menu->Entries.First) != NULL )
+  while( (entry = (SFG_MenuEntry *)menu->Entries.First) != NULL )
   {
     fgListRemove(&menu->Entries, &entry->Node);
 
@@ -486,10 +486,10 @@ void fgDestroyStructure( void )
   /*
    * Make sure all windows and menus have been deallocated
    */
-  while( (window = fgStructure.Windows.First) != NULL )
+  while( (window = (SFG_Window *)fgStructure.Windows.First) != NULL )
     fgDestroyWindow( window, TRUE );
 
-  while( (menu = fgStructure.Menus.First) != NULL )
+  while( (menu = (SFG_Menu *)fgStructure.Menus.First) != NULL )
     fgDestroyMenu( menu );
 }
 
@@ -506,8 +506,8 @@ void fgEnumWindows( FGCBenumerator enumCallback, SFG_Enumerator* enumerator )
   /*
    * Check every of the top-level windows
    */
-  for( window = fgStructure.Windows.First; window;
-       window = window->Node.Next )
+  for( window = (SFG_Window *)fgStructure.Windows.First; window;
+       window = (SFG_Window *)window->Node.Next )
   {
     /*
      * Execute the callback...
@@ -535,7 +535,7 @@ void fgEnumSubWindows( SFG_Window* window, FGCBenumerator enumCallback, SFG_Enum
   /*
    * Check every of the window's children:
    */
-  for( child = window->Children.First; child; child = child->Node.Next )
+  for( child = (SFG_Window *)window->Children.First; child; child = (SFG_Window *)child->Node.Next )
   {
     /*
      * Execute the callback...
@@ -694,7 +694,7 @@ SFG_Menu* fgMenuByID( int menuID )
     /*
      * It's enough to check all entries in fgStructure.Menus...
      */
-    for( menu = fgStructure.Menus.First; menu; menu = menu->Node.Next )
+    for( menu = (SFG_Menu *)fgStructure.Menus.First; menu; menu = (SFG_Menu *)menu->Node.Next )
     {
         /*
          * Does the ID number match?
@@ -722,7 +722,7 @@ void fgListAppend(SFG_List *list, SFG_Node *node)
 {
     SFG_Node *ln;
 
-    if ( (ln = list->Last) != NULL )
+    if ( (ln = (SFG_Node *)list->Last) != NULL )
     {
         ln->Next = node;
         node->Prev = ln;
@@ -741,13 +741,13 @@ void fgListRemove(SFG_List *list, SFG_Node *node)
 {
     SFG_Node *ln;
 
-    if ( (ln = node->Next) != NULL )
+    if ( (ln = (SFG_Node *)node->Next) != NULL )
         ln->Prev = node->Prev;
-    if ( (ln = node->Prev) != NULL )
+    if ( (ln = (SFG_Node *)node->Prev) != NULL )
         ln->Next = node->Next;
-    if ( (ln = list->First) == node )
+    if ( (ln = (SFG_Node *)list->First) == node )
         list->First = node->Next;
-    if ( (ln = list->Last) == node )
+    if ( (ln = (SFG_Node *)list->Last) == node )
         list->Last = node->Prev;
 }
 
@@ -756,7 +756,7 @@ int fgListLength(SFG_List *list)
     SFG_Node *node;
     int length = 0;
 
-    for( node = list->First; node; node = node->Next )
+    for( node = (SFG_Node *)list->First; node; node = (SFG_Node *)node->Next )
         ++length;
 
     return( length );