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-rw-r--r--include/tls.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/tls.h b/include/tls.h
index 2e20a45582..ffd3e4e70c 100644
--- a/include/tls.h
+++ b/include/tls.h
@@ -1,5 +1,8 @@
 /* This file defines USE___THREAD to 1 or 0 to cut down on the #if mess.  */
 
+#ifndef _include_tls_h
+#define _include_tls_h 1
+
 #include_next <tls.h>
 
 #if USE_TLS && HAVE___THREAD \
@@ -12,3 +15,5 @@
 # define USE___THREAD 0
 
 #endif
+
+#endif