diff --git i/src/backend/access/hash/hashovfl.c w/src/backend/access/hash/hashovfl.c
index 130c296..b61c8ee 100644
--- i/src/backend/access/hash/hashovfl.c
+++ w/src/backend/access/hash/hashovfl.c
@@ -391,7 +391,10 @@ _hash_freeovflpage(Relation rel, Buffer ovflbuf,
 	uint32		ovflbitno;
 	int32		bitmappage,
 				bitmapbit;
+
+#ifdef USE_ASSERT_CHECKING
 	Bucket		bucket;
+#endif
 
 	/* Get information from the doomed page */
 	_hash_checkpage(rel, ovflbuf, LH_OVERFLOW_PAGE);
@@ -400,7 +403,9 @@ _hash_freeovflpage(Relation rel, Buffer ovflbuf,
 	ovflopaque = (HashPageOpaque) PageGetSpecialPointer(ovflpage);
 	nextblkno = ovflopaque->hasho_nextblkno;
 	prevblkno = ovflopaque->hasho_prevblkno;
+#ifdef USE_ASSERT_CHECKING
 	bucket = ovflopaque->hasho_bucket;
+#endif
 
 	/*
 	 * Zero the page for debugging's sake; then write and release it. (Note:
diff --git i/src/backend/executor/execCurrent.c w/src/backend/executor/execCurrent.c
index b07161f..2c8929b 100644
--- i/src/backend/executor/execCurrent.c
+++ w/src/backend/executor/execCurrent.c
@@ -151,7 +151,7 @@ execCurrentOf(CurrentOfExpr *cexpr,
 	{
 		ScanState  *scanstate;
 		bool		lisnull;
-		Oid			tuple_tableoid;
+		Oid tuple_tableoid PG_USED_FOR_ASSERTS_ONLY;
 		ItemPointer tuple_tid;
 
 		/*
diff --git i/src/backend/executor/nodeMaterial.c w/src/backend/executor/nodeMaterial.c
index b320b54..3a6bfec 100644
--- i/src/backend/executor/nodeMaterial.c
+++ w/src/backend/executor/nodeMaterial.c
@@ -66,7 +66,7 @@ ExecMaterial(MaterialState *node)
 			 * Allocate a second read pointer to serve as the mark. We know it
 			 * must have index 1, so needn't store that.
 			 */
-			int			ptrno;
+			int ptrno	PG_USED_FOR_ASSERTS_ONLY;
 
 			ptrno = tuplestore_alloc_read_pointer(tuplestorestate,
 												  node->eflags);
diff --git i/src/backend/executor/nodeSetOp.c w/src/backend/executor/nodeSetOp.c
index 7fa5730..ad2e80d 100644
--- i/src/backend/executor/nodeSetOp.c
+++ w/src/backend/executor/nodeSetOp.c
@@ -344,7 +344,7 @@ setop_fill_hash_table(SetOpState *setopstate)
 	SetOp	   *node = (SetOp *) setopstate->ps.plan;
 	PlanState  *outerPlan;
 	int			firstFlag;
-	bool		in_first_rel;
+	bool in_first_rel __attribute__((unused));
 
 	/*
 	 * get state info from node
diff --git i/src/include/c.h w/src/include/c.h
index 82acd14..2dd5c67 100644
--- i/src/include/c.h
+++ w/src/include/c.h
@@ -850,4 +850,10 @@ extern int	fdatasync(int fildes);
 /* /port compatibility functions */
 #include "port.h"
 
+#ifdef USE_ASSERT_CHECKING
+#define PG_USED_FOR_ASSERTS_ONLY
+#else
+#define PG_USED_FOR_ASSERTS_ONLY __attribute__((unused))
+#endif
+
 #endif   /* C_H */