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-rw-r--r--win/tclWinPort.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/win/tclWinPort.h b/win/tclWinPort.h
index 5e7f9c3..ef6918f 100644
--- a/win/tclWinPort.h
+++ b/win/tclWinPort.h
@@ -355,6 +355,9 @@ typedef DWORD_PTR * PDWORD_PTR;
#ifndef R_OK
# define R_OK 04
#endif
+#ifndef O_ACCMODE
+# define O_ACCMODE (O_RDONLY | O_WRONLY | O_RDWR)
+#endif
/*
* Define macros to query file type bits, if they're not already