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-rw-r--r--include/signal.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/signal.h b/include/signal.h
index d4856a89..72bffd61 100644
--- a/include/signal.h
+++ b/include/signal.h
@@ -28,9 +28,11 @@ extern "C" {
 
 #define SIG_HOLD ((void (*)(int)) 2)
 
+#ifndef SIG_BLOCK
 #define SIG_BLOCK     0
 #define SIG_UNBLOCK   1
 #define SIG_SETMASK   2
+#endif
 
 #define SI_ASYNCNL (-60)
 #define SI_TKILL (-6)