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-rw-r--r--ghc/rts/ThreadLabels.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/ghc/rts/ThreadLabels.c b/ghc/rts/ThreadLabels.c
index fda40c3f00..79a0a77e65 100644
--- a/ghc/rts/ThreadLabels.c
+++ b/ghc/rts/ThreadLabels.c
@@ -2,6 +2,8 @@
#include "PosixSource.h"
#include "ThreadLabels.h"
+#include <stdlib.h>
+
HashTable * threadLabels = NULL;
void