diff --git a/cmake b/cmake
index 51114339b..ddd0136d4 160000
--- a/cmake
+++ b/cmake
@@ -1 +1 @@
-Subproject commit 51114339b929a662fb85d45ab6310b0423ac4cef
+Subproject commit ddd0136d4e99b0daab16361aad5338ad3ca4b808
diff --git a/core/src/CMakeLists.txt b/core/src/CMakeLists.txt
index a31116ddd..9f9fc2152 100755
--- a/core/src/CMakeLists.txt
+++ b/core/src/CMakeLists.txt
@@ -169,7 +169,6 @@ set (LIB_SRC
   util/log.c
   util/message.c
   util/nrmessage.c
-  util/os.c
   util/parser.c
   util/rand.c
   util/resolve.c
diff --git a/core/src/kernel/battle.c b/core/src/kernel/battle.c
index a380c5d78..b38443fd6 100644
--- a/core/src/kernel/battle.c
+++ b/core/src/kernel/battle.c
@@ -59,7 +59,6 @@ OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 #include <util/bsdstring.h>
 #include <util/language.h>
 #include <util/log.h>
-#include <util/os.h>
 #include <util/parser.h>
 #include <quicklist.h>
 #include <util/rand.h>
diff --git a/core/src/kernel/reports.c b/core/src/kernel/reports.c
index 86d0489ec..4b20ccbf3 100644
--- a/core/src/kernel/reports.c
+++ b/core/src/kernel/reports.c
@@ -52,7 +52,6 @@ OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 #include <util/language.h>
 #include <util/lists.h>
 #include <util/log.h>
-#include <util/os.h>
 #include <quicklist.h>
 
 /* libc includes */
diff --git a/core/src/kernel/save.c b/core/src/kernel/save.c
index d3d0ddba6..8e2a1fb2c 100644
--- a/core/src/kernel/save.c
+++ b/core/src/kernel/save.c
@@ -61,7 +61,6 @@ OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 #include <util/language.h>
 #include <util/lists.h>
 #include <util/log.h>
-#include <util/os.h>
 #include <util/parser.h>
 #include <quicklist.h>
 #include <util/rand.h>
diff --git a/core/src/util/os.c b/core/src/util/os.c
deleted file mode 100644
index 5a7220e7d..000000000
--- a/core/src/util/os.c
+++ /dev/null
@@ -1,18 +0,0 @@
-#include "os.h"
-
-#if defined(WIN32)
-#include <direct.h>
-#else   /* WIN32 */
-#include <sys/types.h>
-#include <sys/stat.h>
-#endif  /* WIN32 */
-int os_mkdir(const char *path, int mode) 
-{
-  
-#ifdef WIN32
-  mode = mode;
-  return _mkdir(path);  
-#else   /* POSIX is our last hope */
-  return mkdir(path, (mode_t) mode);  
-#endif  /* WIN32 */
-}
diff --git a/core/src/util/os.h b/core/src/util/os.h
deleted file mode 100644
index cf4bb06ea..000000000
--- a/core/src/util/os.h
+++ /dev/null
@@ -1,29 +0,0 @@
-/*
-Copyright (c) 1998-2010, Enno Rehling <enno@eressea.de>
-                         Katja Zedel <katze@felidae.kn-bremen.de
-                         Christian Schlittchen <corwin@amber.kn-bremen.de>
-
-Permission to use, copy, modify, and/or distribute this software for any
-purpose with or without fee is hereby granted, provided that the above
-copyright notice and this permission notice appear in all copies.
-
-THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
-ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
-ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
-OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-**/
-
-#ifndef _OS_H
-#define _OS_H
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-  extern int os_mkdir(const char *path, int mode);
-#ifdef __cplusplus
-}
-#endif
-#endif