Index: readline/histfile.c
===================================================================
--- readline/histfile.c	(revision 368)
+++ readline/histfile.c	(working copy)
@@ -70,17 +70,18 @@
 #endif /* HAVE_MMAP */
 
 /* If we're compiling for __EMX__ (OS/2) or __CYGWIN__ (cygwin32 environment
-   on win 95/98/nt), we want to open files with O_BINARY mode so that there
+   on win 95/98/nt) or __MINGW32__ (pure windows environment),
+   we want to open files with O_BINARY mode so that there
    is no \n -> \r\n conversion performed.  On other systems, we don't want to
    mess around with O_BINARY at all, so we ensure that it's defined to 0. */
-#if defined (__EMX__) || defined (__CYGWIN__)
+#if defined (__EMX__) || defined (__CYGWIN__) || defined (__MINGW32__)
 #  ifndef O_BINARY
 #    define O_BINARY 0
 #  endif
-#else /* !__EMX__ && !__CYGWIN__ */
+#else /* !__EMX__ && !__CYGWIN__ && !__MINGW32__ */ 
 #  undef O_BINARY
 #  define O_BINARY 0
-#endif /* !__EMX__ && !__CYGWIN__ */
+#endif /* !__EMX__ && !__CYGWIN__ && !__MINGW32__ */
 
 #include <errno.h>
 #if !defined (errno)