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diff --git a/execute.c b/execute.c
index e7b4496..1c342da 100644
--- a/execute.c
+++ b/execute.c
@@ -48,6 +48,13 @@
#endif
+/* environ is the exported symbol referencing the internal
+ __cygwin_environ variable on cygwin64:
+ <https://cygwin.com/ml/cygwin/2013-06/msg00228.html>. */
+#if defined __CYGWIN__ && defined __x86_64__
+extern DLL_VARIABLE char **environ;
+#endif
+
/* The results of open() in this file are not used with fchdir,
therefore save some unnecessary work in fchdir.c. */
#undef open
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