# define PATH_SEPARATOR ':'
#endif
-#if defined (_WIN32) || defined (__MSDOS__) || defined (__DJGPP__) || \
- defined (__OS2__)
+#if (defined (_WIN32) && ! defined(__CYGWIN__)) || defined (__MSDOS__) || \
+ defined (__DJGPP__) || defined (__OS2__)
# define HAVE_DOS_BASED_FILE_SYSTEM
# define FOPEN_WB "wb"
# ifndef DIR_SEPARATOR_2