diff --git a/win32/include/_mingw.h b/win32/include/_mingw.h
index e8e95614..00ff2fcd 100644
--- a/win32/include/_mingw.h
+++ b/win32/include/_mingw.h
@@ -38,9 +38,8 @@
 #define __unaligned __attribute__((packed))
 #define __fastcall __attribute__((fastcall))
 
-// #define __MINGW_IMPORT extern __declspec(dllimport)
+#define __MINGW_IMPORT extern __declspec(dllimport)
 #undef _MSVCRT_
-#undef __MINGW_IMPORT
 #define __MINGW_ATTRIB_NORETURN
 #define __MINGW_ATTRIB_CONST
 #define __MINGW_ATTRIB_DEPRECATED
@@ -124,10 +123,12 @@ typedef struct localeinfo_struct _locale_tstruct,*_locale_t;
 #define _ANONYMOUS_STRUCT
 #define DECLSPEC_NORETURN
 #define DECLARE_STDCALL_P(type) __stdcall type
-#define WIN32_LEAN_AND_MEAN
 #define NOSERVICE 1
 #define NOMCX 1
 #define NOIME 1
+#ifndef WIN32_LEAN_AND_MEAN
+# define WIN32_LEAN_AND_MEAN 1
+#endif
 #ifndef WINVER
 # define WINVER 0x0502
 #endif
diff --git a/win32/include/malloc.h b/win32/include/malloc.h
index bd9ad11c..8426600a 100644
--- a/win32/include/malloc.h
+++ b/win32/include/malloc.h
@@ -144,13 +144,9 @@ extern "C" {
 #endif /* RC_INVOKED */
 
 #ifndef	NO_OLDNAMES
-#undef alloca
 #ifdef __GNUC__
+#undef alloca
 #define alloca(x) __builtin_alloca((x))
-#else
-#ifndef __TINYC__ //gr
-#define alloca _alloca
-#endif
 #endif
 #endif
 
diff --git a/win32/include/time.h b/win32/include/time.h
index 9852fc70..6c72e266 100644
--- a/win32/include/time.h
+++ b/win32/include/time.h
@@ -119,10 +119,10 @@ extern "C" {
 
 #define CLOCKS_PER_SEC 1000
 
-//!__TINYC__:   __MINGW_IMPORT int _daylight;
-//!__TINYC__:   __MINGW_IMPORT long _dstbias;
-//!__TINYC__:   __MINGW_IMPORT long _timezone;
-//!__TINYC__:   __MINGW_IMPORT char * _tzname[2];
+  __MINGW_IMPORT int _daylight;
+  __MINGW_IMPORT long _dstbias;
+  __MINGW_IMPORT long _timezone;
+  __MINGW_IMPORT char * _tzname[2];
   _CRTIMP errno_t __cdecl _get_daylight(int *_Daylight);
   _CRTIMP errno_t __cdecl _get_dstbias(long *_Daylight_savings_bias);
   _CRTIMP errno_t __cdecl _get_timezone(long *_Timezone);
@@ -242,9 +242,10 @@ __CRT_INLINE time_t __cdecl time(time_t *_Time) { return _time64(_Time); }
 #if !defined(NO_OLDNAMES) || defined(_POSIX)
 #define CLK_TCK CLOCKS_PER_SEC
 
-  _CRTIMP extern int daylight;
-  _CRTIMP extern long timezone;
-  _CRTIMP extern char *tzname[2];
+  __MINGW_IMPORT int daylight;
+  __MINGW_IMPORT long dstbias;
+  __MINGW_IMPORT long timezone;
+  __MINGW_IMPORT char *tzname[2];
   void __cdecl tzset(void);
 #endif