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diff --git a/beos/beosish.h b/beos/beosish.h
index 66de110..7aab15f 100644
--- a/beos/beosish.h
+++ b/beos/beosish.h
@@ -11,5 +11,28 @@ pid_t beos_waitpid(pid_t process_id, int *status_location, int options);
 /* This seems to be protoless. */
 char *gcvt(double value, int num_digits, char *buffer);
 
+/* flock support, if available */
+#ifdef HAS_FLOCK
+
+#include <flock.h>
+
+#undef close
+#define close flock_close
+
+#undef dup2
+#define dup2 flock_dup2
+
+#endif /* HAS_FLOCK */
+
+
+#undef kill
+#define kill beos_kill
+int beos_kill(pid_t pid, int sig);
+
+#undef sigaction
+#define sigaction(sig, act, oact) beos_sigaction((sig), (act), (oact))
+int beos_sigaction(int sig, const struct sigaction *act,
+                   struct sigaction *oact);
+
 #endif