diff --git a/examples/osgsimulation/osgsimulation.cpp b/examples/osgsimulation/osgsimulation.cpp
index 6aa58fd36..c5509b43a 100644
--- a/examples/osgsimulation/osgsimulation.cpp
+++ b/examples/osgsimulation/osgsimulation.cpp
@@ -16,7 +16,7 @@
 *  THE SOFTWARE.
 */
 
-#ifdef WIN32
+#if defined(WIN32) && !(defined(__CYGWIN__) || defined(__MINGW32__))
 /////////////////////////////////////////////////////////////////////////////
 // Disable unavoidable warning messages:
 
diff --git a/src/osgDB/FileNameUtils.cpp b/src/osgDB/FileNameUtils.cpp
index 39b4f5406..f67e527be 100644
--- a/src/osgDB/FileNameUtils.cpp
+++ b/src/osgDB/FileNameUtils.cpp
@@ -19,7 +19,9 @@
 #include <osgDB/FileUtils>
 
 #ifdef WIN32
+#if !defined(__MINGW32__)
     #define _WIN32_WINNT 0x0500
+#endif
     #include <windows.h>
 #endif
 
diff --git a/src/osgDB/FileUtils.cpp b/src/osgDB/FileUtils.cpp
index 1575efcaa..7d86b3788 100644
--- a/src/osgDB/FileUtils.cpp
+++ b/src/osgDB/FileUtils.cpp
@@ -34,7 +34,10 @@ typedef char TCHAR;
     #include <direct.h> // for _mkdir
 
     #define mkdir(x,y) _mkdir((x))
+
+#if !defined(__MINGW32__)
     #define stat64 _stati64
+#endif
 
     // set up for windows so acts just like unix access().
 #ifndef F_OK
diff --git a/src/osgPlugins/zip/unzip.cpp b/src/osgPlugins/zip/unzip.cpp
index 29c87e3e9..73cae9fb4 100644
--- a/src/osgPlugins/zip/unzip.cpp
+++ b/src/osgPlugins/zip/unzip.cpp
@@ -2989,7 +2989,7 @@ int unzlocal_getByte(LUFILE *fin,int *pi)
 int unzlocal_getShort (LUFILE *fin,uLong *pX)
 {
     uLong x ;
-    int i;
+    int i = 0;
     int err;
 
     err = unzlocal_getByte(fin,&i);
@@ -3009,7 +3009,7 @@ int unzlocal_getShort (LUFILE *fin,uLong *pX)
 int unzlocal_getLong (LUFILE *fin,uLong *pX)
 {
     uLong x ;
-    int i;
+    int i = 0;
     int err;
 
     err = unzlocal_getByte(fin,&i);
diff --git a/src/osgViewer/GraphicsWindowWin32.cpp b/src/osgViewer/GraphicsWindowWin32.cpp
index 7122ce4c9..f4b1bda19 100644
--- a/src/osgViewer/GraphicsWindowWin32.cpp
+++ b/src/osgViewer/GraphicsWindowWin32.cpp
@@ -1674,9 +1674,9 @@ static int ChooseMatchingPixelFormat( HDC hdc, int screenNum, const WGLIntegerAt
             1,                     // version number
             PFD_DRAW_TO_WINDOW |   // support window
             PFD_SUPPORT_OPENGL |   // support OpenGL
-            DWORD(_traits->doubleBuffer ? PFD_DOUBLEBUFFER : NULL) |      // double buffered ?
-            DWORD(_traits->swapMethod ==  osg::DisplaySettings::SWAP_COPY ? PFD_SWAP_COPY : NULL) |
-            DWORD(_traits->swapMethod ==  osg::DisplaySettings::SWAP_EXCHANGE ? PFD_SWAP_EXCHANGE : NULL),
+            DWORD(_traits->doubleBuffer ? PFD_DOUBLEBUFFER : 0) |      // double buffered ?
+            DWORD(_traits->swapMethod ==  osg::DisplaySettings::SWAP_COPY ? PFD_SWAP_COPY : 0) |
+            DWORD(_traits->swapMethod ==  osg::DisplaySettings::SWAP_EXCHANGE ? PFD_SWAP_EXCHANGE : 0),
             PFD_TYPE_RGBA,         // RGBA type
             BYTE(_traits->red + _traits->green + _traits->blue),                      // color depth
             BYTE(_traits->red), 0, BYTE(_traits->green), 0, BYTE(_traits->blue), 0,   // shift bits ignored