From f3e5dd7a047e53790fe6316d5a5130dc5df80ef1 Mon Sep 17 00:00:00 2001
From: "jan.nijtmans" <nijtmans@users.sourceforge.net>
Date: Fri, 20 Dec 2019 16:13:36 +0000
Subject: Prevent double definition of MODULE_SCOPE on Darwin

---
 unix/configure | 1 +
 unix/tcl.m4    | 1 +
 2 files changed, 2 insertions(+)

diff --git a/unix/configure b/unix/configure
index 2576665..d1f796b 100755
--- a/unix/configure
+++ b/unix/configure
@@ -7851,6 +7851,7 @@ cat >>confdefs.h <<\_ACEOF
 #define MODULE_SCOPE __private_extern__
 _ACEOF
 
+		tcl_cv_cc_visibility_hidden=yes
 
 fi
 
diff --git a/unix/tcl.m4 b/unix/tcl.m4
index 0e146e4..cfdb659 100644
--- a/unix/tcl.m4
+++ b/unix/tcl.m4
@@ -1619,6 +1619,7 @@ AC_DEFUN([SC_CONFIG_CFLAGS], [
 	    AS_IF([test "$tcl_cv_cc_visibility_hidden" != yes], [
 		AC_DEFINE(MODULE_SCOPE, [__private_extern__],
 		    [Compiler support for module scope symbols])
+		tcl_cv_cc_visibility_hidden=yes
 	    ])
 	    CC_SEARCH_FLAGS=""
 	    LD_SEARCH_FLAGS=""
-- 
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