diff -ru iup.orig/srcmglplot/mgl2/define.h iup.patched/srcmglplot/mgl2/define.h
--- iup.orig/srcmglplot/mgl2/define.h	2015-02-05 16:54:20.024244200 +0100
+++ iup.patched/srcmglplot/mgl2/define.h	2015-02-05 18:34:27.567486400 +0100
@@ -135,7 +135,7 @@
 #define M_PI	3.14159265358979323846  /* pi */
 #endif
 //-----------------------------------------------------------------------------
-#ifdef WIN32
+#if defined(WIN32) && !defined(__CYGWIN__)
 #define mglprintf    _snwprintf
 #else
 #define mglprintf    swprintf
diff -ru iup.orig/srcmglplot/src/addon.cpp iup.patched/srcmglplot/src/addon.cpp
--- iup.orig/srcmglplot/src/addon.cpp	2015-02-05 16:54:20.053245900 +0100
+++ iup.patched/srcmglplot/src/addon.cpp	2015-02-05 18:32:27.299982800 +0100
@@ -18,9 +18,9 @@
  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  ***************************************************************************/
 #include <stdarg.h>
-#ifdef WIN32
+#if defined(WIN32) && !defined(__CYGWIN__)
 #include <io.h>
-#include <direct.h>
+#include <dirent.h>
 #else
 #include <unistd.h>
 #endif
diff -ru iup.orig/srcmglplot/src/exec.cpp iup.patched/srcmglplot/src/exec.cpp
--- iup.orig/srcmglplot/src/exec.cpp	2015-02-05 16:54:20.084247700 +0100
+++ iup.patched/srcmglplot/src/exec.cpp	2015-02-05 18:33:14.932486400 +0100
@@ -17,7 +17,7 @@
  *   Free Software Foundation, Inc.,                                       *
  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  ***************************************************************************/
-#ifdef WIN32
+#if defined(WIN32) && !defined(__CYGWIN__)
 #include <io.h>
 #include <direct.h>
 #else
diff -ru iup.orig/srcmglplot/src/export.cpp iup.patched/srcmglplot/src/export.cpp
--- iup.orig/srcmglplot/src/export.cpp	2015-02-05 16:54:20.085247700 +0100
+++ iup.patched/srcmglplot/src/export.cpp	2015-02-05 18:33:24.328686400 +0100
@@ -610,7 +610,7 @@
 	char *f=new char[n+1];	memcpy(f,descr,n);	f[n]=0;
 	mgl_write_frame(_GR_,s,f);	delete []s;		delete []f;}
 //-----------------------------------------------------------------------------
-#ifdef WIN32
+#if defined(WIN32) && !defined(__CYGWIN__)
 #include <io.h>
 #include <direct.h>
 #endif
diff -ru iup.orig/srcmglplot/src/parser.cpp iup.patched/srcmglplot/src/parser.cpp
--- iup.orig/srcmglplot/src/parser.cpp	2015-02-05 16:54:20.100248600 +0100
+++ iup.patched/srcmglplot/src/parser.cpp	2015-02-05 18:36:39.368886400 +0100
@@ -22,7 +22,7 @@
 #include "mgl2/canvas_cf.h"
 #include "mgl2/base.h"
 //-----------------------------------------------------------------------------
-#ifdef WIN32
+#if defined(WIN32) && !defined(__CYGWIN__)
 #include <io.h>
 wchar_t *wcstokw32(wchar_t *wcs, const wchar_t *delim)	{	return wcstok(wcs,delim);	}
 #define wcstok(a,b,c) wcstokw32(a,b)