PG <= 14 misses PGDLLIMPORT on some variables

Author: df7cb

concurrent.c

@@ -19,6 +19,10 @@
 #include "replication/decode.h"
 #include "utils/rel.h"
 
+#if PG_VERSION_NUM < 150000
+extern PGDLLIMPORT int wal_segment_size;
+#endif
+
 static void apply_concurrent_changes(DecodingOutputState *dstate,
 									 Relation relation, ScanKey key,
 									 int nkeys, IndexInsertState *iistate);

pg_squeeze.c

@@ -65,6 +65,11 @@
 #include "utils/rel.h"
 #include "utils/syscache.h"
 
+#if PG_VERSION_NUM < 150000
+extern PGDLLIMPORT int wal_segment_size;
+extern PGDLLIMPORT bool FirstSnapshotSet;
+#endif
+
 #if PG_VERSION_NUM < 120000
 #include "utils/tqual.h"
 #endif