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-rw-r--r--includes/Rts.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/includes/Rts.h b/includes/Rts.h
index d96545005c..b5737d4d0e 100644
--- a/includes/Rts.h
+++ b/includes/Rts.h
@@ -51,7 +51,9 @@ extern "C" {
/* Needed to get the macro version of errno on some OSs, and also to
get prototypes for the _r versions of C library functions. */
+#ifndef _REENTRANT
#define _REENTRANT 1
+#endif
/*
* We often want to know the size of something in units of an