Index: src/alter.c
==================================================================
--- src/alter.c
+++ src/alter.c
@@ -75,12 +75,12 @@
         len = sqlite3GetToken(zCsr, &token);
       } while( token==TK_SPACE );
       assert( len>0 );
     } while( token!=TK_LP && token!=TK_USING );
 
-    zRet = sqlite3MPrintf(db, "%.*s\"%w\"%s", ((u8*)tname.z) - zSql, zSql, 
-       zTableName, tname.z+tname.n);
+    zRet = sqlite3MPrintf(db, "%.*s\"%w\"%s", (int)(((u8*)tname.z) - zSql),
+       zSql, zTableName, tname.z+tname.n);
     sqlite3_result_text(context, zRet, -1, SQLITE_DYNAMIC);
   }
 }
 
 /*
@@ -128,11 +128,11 @@
       zParent = sqlite3DbStrNDup(db, (const char *)z, n);
       if( zParent==0 ) break;
       sqlite3Dequote(zParent);
       if( 0==sqlite3StrICmp((const char *)zOld, zParent) ){
         char *zOut = sqlite3MPrintf(db, "%s%.*s\"%w\"", 
-            (zOutput?zOutput:""), z-zInput, zInput, (const char *)zNew
+            (zOutput?zOutput:""), (int)(z-zInput), zInput, (const char *)zNew
         );
         sqlite3DbFree(db, zOutput);
         zOutput = zOut;
         zInput = &z[n];
       }
@@ -214,12 +214,12 @@
     } while( dist!=2 || (token!=TK_WHEN && token!=TK_FOR && token!=TK_BEGIN) );
 
     /* Variable tname now contains the token that is the old table-name
     ** in the CREATE TRIGGER statement.
     */
-    zRet = sqlite3MPrintf(db, "%.*s\"%w\"%s", ((u8*)tname.z) - zSql, zSql, 
-       zTableName, tname.z+tname.n);
+    zRet = sqlite3MPrintf(db, "%.*s\"%w\"%s", (int)(((u8*)tname.z) - zSql),
+       zSql, zTableName, tname.z+tname.n);
     sqlite3_result_text(context, zRet, -1, SQLITE_DYNAMIC);
   }
 }
 #endif   /* !SQLITE_OMIT_TRIGGER */