diff --git a/ExternalLibs/ttvfs/VFSFileFuncs.cpp b/ExternalLibs/ttvfs/VFSFileFuncs.cpp
index b6a749b..183bf75 100644
--- a/ExternalLibs/ttvfs/VFSFileFuncs.cpp
+++ b/ExternalLibs/ttvfs/VFSFileFuncs.cpp
@@ -2,6 +2,8 @@
 #include "VFSInternal.h"
 #include "VFSFileFuncs.h"
 
+#include <stdio.h>
+
 VFS_NAMESPACE_START
 
 // Compile time assertion to make sure things work as expected
diff --git a/ExternalLibs/ttvfs/VFSInternal.h b/ExternalLibs/ttvfs/VFSInternal.h
index bcf8d78..54ec5f2 100644
--- a/ExternalLibs/ttvfs/VFSInternal.h
+++ b/ExternalLibs/ttvfs/VFSInternal.h
@@ -14,9 +14,18 @@
 #include "VFSDefines.h"
 
 #if defined(VFS_LARGEFILE_SUPPORT)
+# ifndef _LARGEFILE_SOURCE
 #  define _LARGEFILE_SOURCE
+# endif
+# ifndef _LARGEFILE64_SOURCE
 #  define _LARGEFILE64_SOURCE
+# endif
+# ifdef _FILE_OFFSET_BITS
+#  undef _FILE_OFFSET_BITS
+# endif
+# ifndef _FILE_OFFSET_BITS
 #  define _FILE_OFFSET_BITS 64
+# endif
 #endif
 
 #if _MSC_VER
diff --git a/ExternalLibs/ttvfs_cfileapi/ttvfs_stdio.cpp b/ExternalLibs/ttvfs_cfileapi/ttvfs_stdio.cpp
index a719192..7493244 100644
--- a/ExternalLibs/ttvfs_cfileapi/ttvfs_stdio.cpp
+++ b/ExternalLibs/ttvfs_cfileapi/ttvfs_stdio.cpp
@@ -2,8 +2,9 @@
 
 #include "ttvfs.h"
 #include "ttvfs_stdio.h"
-#include <cassert>
+#include <assert.h>
 #include <sstream>
+#include <stdio.h>
 
 
 static ttvfs::Root *vfs = NULL;
diff --git a/ExternalLibs/ttvfs_cfileapi/ttvfs_stdio.h b/ExternalLibs/ttvfs_cfileapi/ttvfs_stdio.h
index f198520..3830723 100644
--- a/ExternalLibs/ttvfs_cfileapi/ttvfs_stdio.h
+++ b/ExternalLibs/ttvfs_cfileapi/ttvfs_stdio.h
@@ -23,6 +23,8 @@
 
 #include <iostream>
 #include <sstream>
+#include <stdio.h>
+
 #include <ttvfs.h>
 
 typedef ttvfs::File VFILE;
diff --git a/ExternalLibs/ttvfs_zip/VFSZipArchiveRef.cpp b/ExternalLibs/ttvfs_zip/VFSZipArchiveRef.cpp
index 0e38b3d..c257a39 100644
--- a/ExternalLibs/ttvfs_zip/VFSZipArchiveRef.cpp
+++ b/ExternalLibs/ttvfs_zip/VFSZipArchiveRef.cpp
@@ -1,4 +1,6 @@
+#include "VFSInternal.h"
 #include "VFSZipArchiveRef.h"
+#include <stdio.h>
 #include "miniz.h"