Avoid implicit int declarations, a feature removed from C language with C99.

diff --git generic/tixDiImg.c generic/tixDiImg.c
index da20d53c16cca3c7..3fb9f800fcd9e52a 100644
--- generic/tixDiImg.c
+++ generic/tixDiImg.c
@@ -352,6 +352,8 @@ Tix_ImageItemDisplay(drawable, iPtr, x, y, width, height, xOffset, yOffset,
     int y;
     int width;
     int height;
+    int xOffset;
+    int yOffset;
     int flags;
 {
     TixImageItem *itPtr = (TixImageItem *)iPtr;
diff --git generic/tixDiWin.c generic/tixDiWin.c
index e62529ecd19a9790..a96cd287e11c34e3 100644
--- generic/tixDiWin.c
+++ generic/tixDiWin.c
@@ -458,6 +458,8 @@ Tix_WindowItemDisplay(drawable, iPtr, x, y, width, height, xOffset, yOffset,
     int y;
     int width;
     int height;
+    int xOffset;
+    int yOffset;
     int flags;
 {
     TixWindowItem *itPtr = (TixWindowItem *)iPtr;
diff --git generic/tixForm.c generic/tixForm.c
index 5ab21f15a99bfde9..ba56617e436f748b 100644
--- generic/tixForm.c
+++ generic/tixForm.c
@@ -150,7 +150,7 @@ static Tcl_HashTable masterInfoHashTable;
 /*
  * Have static variables in this module been initialized?
  */
-static initialized = 0;
+static int initialized = 0;
 
 static int ReqSize(tkwin, axis)
     Tk_Window tkwin;
diff --git unix/tixUnixMwm.c unix/tixUnixMwm.c
index 3c4ac4d83bc51c80..02b58c16311b2c54 100644
--- unix/tixUnixMwm.c
+++ unix/tixUnixMwm.c
@@ -768,7 +768,7 @@ GetMwmInfo(interp, tkwin)
     Tcl_Interp * interp;
     Tk_Window tkwin;
 {
-    static inited = 0;
+    static int inited = 0;
     Tcl_HashEntry *hashPtr;
     int isNew;