diff --git a/include/wx/filefn.h b/include/wx/filefn.h
index 6589123bb2..077f5544b9 100644
--- a/include/wx/filefn.h
+++ b/include/wx/filefn.h
@@ -293,8 +293,12 @@ enum wxPosixPermissions
             #define wxCRT_OpenW       _wopen
         #endif
 
+        wxDECL_FOR_STRICT_MINGW32(int, _wopen, (const wchar_t*, int, ...))
+        wxDECL_FOR_STRICT_MINGW32(int, _waccess, (const wchar_t*, int))
+        wxDECL_FOR_STRICT_MINGW32(int, _wchmod, (const wchar_t*, int))
         wxDECL_FOR_STRICT_MINGW32(int, _wmkdir, (const wchar_t*))
         wxDECL_FOR_STRICT_MINGW32(int, _wrmdir, (const wchar_t*))
+        wxDECL_FOR_STRICT_MINGW32(int, _wstati64, (const wchar_t*, struct _stati64*))
 
         #define   wxCRT_AccessW     _waccess
         #define   wxCRT_ChmodW      _wchmod
diff --git a/include/wx/wxcrtbase.h b/include/wx/wxcrtbase.h
index 7391bc5283..960d20d112 100644
--- a/include/wx/wxcrtbase.h
+++ b/include/wx/wxcrtbase.h
@@ -194,6 +194,9 @@ extern unsigned long android_wcstoul(const wchar_t *nptr, wchar_t **endptr, int
     #endif
 
     #ifdef HAVE_STRTOULL
+        wxDECL_FOR_STRICT_MINGW32(long long, strtoll, (const char*, char**, int))
+        wxDECL_FOR_STRICT_MINGW32(unsigned long long, strtoull, (const char*, char**, int))
+
         #define wxCRT_StrtollA   strtoll
         #define wxCRT_StrtoullA  strtoull
     #endif /* HAVE_STRTOULL */
diff --git a/include/wx/wxcrtvararg.h b/include/wx/wxcrtvararg.h
index b1af0e656f..698525f02f 100644
--- a/include/wx/wxcrtvararg.h
+++ b/include/wx/wxcrtvararg.h
@@ -240,6 +240,8 @@
         return vsscanf(const_cast<char *>(str), format, ap);
     }
 #else
+    wxDECL_FOR_STRICT_MINGW32(int, vsscanf, (const char*, const char*, va_list));
+
     #define wxCRT_VsscanfA   vsscanf
 #endif
 
@@ -255,6 +257,8 @@
 #ifdef wxNEED_VSWSCANF
     int wxCRT_VsscanfW(const wchar_t *str, const wchar_t *format, va_list ap);
 #else
+    wxDECL_FOR_STRICT_MINGW32(int, vswscanf, (const wchar_t*, const wchar_t*, va_list));
+
     #define wxCRT_VsscanfW   wxVMS_USE_STD vswscanf
 #endif
 
diff --git a/src/common/filefn.cpp b/src/common/filefn.cpp
index 188f954677..0a9296a321 100644
--- a/src/common/filefn.cpp
+++ b/src/common/filefn.cpp
@@ -83,6 +83,8 @@
 
 // TODO: Borland probably has _wgetcwd as well?
 #if defined(_MSC_VER) || defined(__MINGW32__)
+    wxDECL_FOR_STRICT_MINGW32(wchar_t*, _wgetcwd, (wchar_t*, int))
+
     #define HAVE_WGETCWD
 #endif
 
diff --git a/src/common/time.cpp b/src/common/time.cpp
index 6c42da537a..b60bf2e6c4 100644
--- a/src/common/time.cpp
+++ b/src/common/time.cpp
@@ -182,6 +182,10 @@ int wxGetTimeZone()
     #if defined(WX_TIMEZONE) // If WX_TIMEZONE was defined by configure, use it.
         return WX_TIMEZONE;
     #elif defined(__BORLANDC__) || defined(__MINGW32__)
+        #if defined(__MINGW32_TOOLCHAIN__) && defined(__STRICT_ANSI__)
+            extern long _timezone;
+        #endif
+
         return _timezone;
     #else // unknown platform -- assume it has timezone
         return timezone;