Considering the BeOS port didn't compile without IPC_STAT and shm_nattch,

I'm betting the QNX4 port does not either ...

Author: tglsfdc

src/backend/port/qnx4/ipc.h

@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/port/qnx4/Attic/ipc.h,v 1.2 2000/04/12 17:15:30 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/port/qnx4/Attic/ipc.h,v 1.3 2001/03/18 18:32:02 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -26,5 +26,6 @@
 
 /* Control Commands. */
 #define IPC_RMID	0			/* remove identifier */
+#define IPC_STAT	1			/* get shm status */
 
 #endif	 /* _SYS_IPC_H */

src/backend/port/qnx4/shm.h

@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/port/qnx4/Attic/shm.h,v 1.2 2000/04/12 17:15:30 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/port/qnx4/Attic/shm.h,v 1.3 2001/03/18 18:32:02 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -28,6 +28,7 @@ extern		"C"
 	struct shmid_ds
 	{
 		int			dummy;
+		int			shm_nattch;
 	};
 
 	extern void *shmat(int shmid, const void *shmaddr, int shmflg);