diff --git a/extract_assets.py b/extract_assets.py
index 706fc728..7c29358b 100755
--- a/extract_assets.py
+++ b/extract_assets.py
@@ -47,6 +47,7 @@ def remove_file(fname):
 def clean_assets(local_asset_file):
     assets = set(read_asset_map().keys())
     assets.update(read_local_asset_list(local_asset_file))
+    local_asset_file.close()
     for fname in list(assets) + [".assets-local.txt"]:
         if fname.startswith("@"):
             continue
diff --git a/include/PR/ultratypes.h b/include/PR/ultratypes.h
index e2a3e771..ddff2827 100644
--- a/include/PR/ultratypes.h
+++ b/include/PR/ultratypes.h
@@ -31,7 +31,12 @@ typedef double f64;
 
 #include <stddef.h>
 #include <stdint.h>
+#if defined(__MINGW32__) 
+#include <_mingw.h>
+#if !defined(__MINGW64_VERSION_MAJOR)
+typedef long ssize_t;
+#else
 typedef ptrdiff_t ssize_t;
-
-
+#endif
+#endif
 #endif
diff --git a/include/types.h b/include/types.h
index 483c894f..870223eb 100644
--- a/include/types.h
+++ b/include/types.h
@@ -1,5 +1,5 @@
-#ifndef _TYPES_H_
-#define _TYPES_H_
+#ifndef _SM64_TYPES_H_
+#define _SM64_TYPES_H_
 
 // This file contains various data types used in Super Mario 64 that don't yet
 // have an appropriate header.
diff --git a/include/ultra64.h b/include/ultra64.h
index 409a3cf7..e78ded49 100644
--- a/include/ultra64.h
+++ b/include/ultra64.h
@@ -30,4 +30,13 @@
 #include <PR/libaudio.h>
 #include <PR/libultra.h>
 
+#if defined(__MINGW32__)
+#include <_mingw.h>
+#if !defined(__MINGW64_VERSION_MAJOR)
+#include <string.h>
+#define bzero(b,len) (memset((b), '\0', (len)), (void) 0)
+#define bcopy(s1, s2, n) memmove((s2), (s1), (n))
+#endif
+#endif
+
 #endif
diff --git a/src/game/bettercamera.inc.h b/src/game/bettercamera.inc.h
index 7d0175b1..db8c04f8 100644
--- a/src/game/bettercamera.inc.h
+++ b/src/game/bettercamera.inc.h
@@ -9,8 +9,11 @@
 #include "include/text_strings.h"
 #include "engine/surface_collision.h"
 #include "pc/configfile.h"
+#if defined(__MINGW32__) && !defined(__MINGW64_VERSION_MAJOR) 
+//quick and dirty fix for some older MinGW.org mingwrt
+#else
 #include <stdio.h>
-
+#endif
 
 
 /**
diff --git a/src/pc/cliopts.c b/src/pc/cliopts.c
index 727de38b..ee35bf60 100644
--- a/src/pc/cliopts.c
+++ b/src/pc/cliopts.c
@@ -5,6 +5,7 @@
 
 #include <strings.h>
 #include <stdlib.h>
+#define __NO_MINGW_LFS //Mysterious error in MinGW.org stdio.h
 #include <stdio.h>
 #include <string.h>
 
diff --git a/src/pc/gfx/gfx_pc.c b/src/pc/gfx/gfx_pc.c
index 4f6968f7..01bea71f 100644
--- a/src/pc/gfx/gfx_pc.c
+++ b/src/pc/gfx/gfx_pc.c
@@ -155,7 +155,24 @@ static size_t buf_vbo_num_tris;
 static struct GfxWindowManagerAPI *gfx_wapi;
 static struct GfxRenderingAPI *gfx_rapi;
 
+#if defined(__MINGW32__) 
+#include <_mingw.h>
+#if !defined(__MINGW64_VERSION_MAJOR)
+#include <windows.h>
+#define CLOCK_MONOTONIC 0
+//https://stackoverflow.com/questions/5404277/porting-clock-gettime-to-windows
+struct timespec { long tv_sec; long tv_nsec; };    //header part
+int clock_gettime(int arg, struct timespec *spec)      //C-file part
+{  __int64 wintime; GetSystemTimeAsFileTime((FILETIME*)&wintime);
+   wintime      -=116444736000000000LL;  //1jan1601 to 1jan1970
+   spec->tv_sec  =wintime / 10000000LL;           //seconds
+   spec->tv_nsec =wintime % 10000000LL*100;      //nano-seconds
+   return 0;
+}
+#else
 #include <time.h>
+#endif
+#endif
 static unsigned long get_time(void) {
     struct timespec ts;
     clock_gettime(CLOCK_MONOTONIC, &ts);
diff --git a/tools/utils.h b/tools/utils.h
index dff1d6a3..03f482d0 100644
--- a/tools/utils.h
+++ b/tools/utils.h
@@ -7,8 +7,9 @@
 
 // printing size_t varies by compiler
 #if defined(_MSC_VER) || defined(__MINGW32__)
+  #include <windows.h>
   #define SIZE_T_FORMAT "%Iu"
-  #define realpath(N,R) _fullpath((R),(N),_MAX_PATH)
+  #define realpath(N,R) _fullpath((R),(N),MAX_PATH)
 #else
   #define SIZE_T_FORMAT "%zu"
 #endif