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-rw-r--r--unix/tclUnixPort.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/unix/tclUnixPort.h b/unix/tclUnixPort.h
index 7cfeec0..08a4f44 100644
--- a/unix/tclUnixPort.h
+++ b/unix/tclUnixPort.h
@@ -95,9 +95,11 @@ typedef off_t Tcl_SeekOffset;
# define USE_PUTENV 1
# define USE_PUTENV_FOR_UNSET 1
/* On Cygwin, the environment is imported from the Cygwin DLL. */
+#ifndef __x86_64__
# define environ __cygwin_environ
-# define timezone _timezone
extern char **__cygwin_environ;
+#endif
+# define timezone _timezone
extern int TclOSstat(const char *name, void *statBuf);
extern int TclOSlstat(const char *name, void *statBuf);
#elif defined(HAVE_STRUCT_STAT64) && !defined(__APPLE__)