diff --git a/src/bin/pg_dump/pg_backup_archiver.h b/src/bin/pg_dump/pg_backup_archiver.h
index db13507b470..fa2c6eff5ad 100644
--- a/src/bin/pg_dump/pg_backup_archiver.h
+++ b/src/bin/pg_dump/pg_backup_archiver.h
@@ -426,8 +426,6 @@ typedef struct _archiveOpts
 extern TocEntry *ArchiveEntry(Archive *AHX, CatalogId catalogId,
 							  DumpId dumpId, ArchiveOpts *opts);
 
-extern void WriteTOC(ArchiveHandle *AH);
-extern void ReadTOC(ArchiveHandle *AH);
 extern void WriteHead(ArchiveHandle *AH);
 extern void ReadHead(ArchiveHandle *AH);
 extern void WriteToc(ArchiveHandle *AH);
diff --git a/src/include/bootstrap/bootstrap.h b/src/include/bootstrap/bootstrap.h
index 03706ad4f69..85705602cb3 100644
--- a/src/include/bootstrap/bootstrap.h
+++ b/src/include/bootstrap/bootstrap.h
@@ -34,8 +34,6 @@ extern int	numattr;
 
 extern void AuxiliaryProcessMain(int argc, char *argv[]) pg_attribute_noreturn();
 
-extern void err_out(void);
-
 extern void closerel(char *name);
 extern void boot_openrel(char *name);
 
diff --git a/src/include/utils/rel.h b/src/include/utils/rel.h
index d7f33abce3f..d35b4a5061c 100644
--- a/src/include/utils/rel.h
+++ b/src/include/utils/rel.h
@@ -604,6 +604,5 @@ typedef struct ViewOptions
 extern void RelationIncrementReferenceCount(Relation rel);
 extern void RelationDecrementReferenceCount(Relation rel);
 extern bool RelationHasUnloggedIndex(Relation rel);
-extern List *RelationGetRepsetList(Relation rel);
 
 #endif							/* REL_H */
diff --git a/src/interfaces/libpq/libpq-int.h b/src/interfaces/libpq/libpq-int.h
index c0b8e3f8cef..fcf2bc2cab3 100644
--- a/src/interfaces/libpq/libpq-int.h
+++ b/src/interfaces/libpq/libpq-int.h
@@ -660,7 +660,6 @@ extern int	pqWriteReady(PGconn *conn);
 /* === in fe-secure.c === */
 
 extern int	pqsecure_initialize(PGconn *);
-extern void pqsecure_destroy(void);
 extern PostgresPollingStatusType pqsecure_open_client(PGconn *);
 extern void pqsecure_close(PGconn *);
 extern ssize_t pqsecure_read(PGconn *, void *ptr, size_t len);