Provide NULL when missing

diff --git a/compat/compat_shared.h b/compat/compat_shared.h
index 556537b59d6539542ba01c402329aea22b10c451..1860a07f9597fb13ebf322d38c9c96eb74eda627 100644 (file)
--- a/compat/compat_shared.h
+++ b/compat/compat_shared.h
@@ -220,5 +220,9 @@ max(A const & lhs, A const & rhs)
 #define SA_RESETHAND SA_ONESHOT
 #endif
 
+/* NULL is not always provided. */
+#ifndef NULL
+#define NULL ((void *)0)
+#endif
 
 #endif /* _SQUID_COMPAT_SHARED_H */