Moved _PG_init

src/vector.c

@@ -2,7 +2,9 @@
 
 #include <math.h>
 
+#include "ivfflat.h"
 #include "vector.h"
+
 #include "fmgr.h"
 #include "catalog/pg_type.h"
 #include "lib/stringinfo.h"
@@ -29,6 +31,15 @@
 
 PG_MODULE_MAGIC;
 
+/*
+ * Initialize index options and variables
+ */
+void
+_PG_init(void)
+{
+	IvfflatInit();
+}
+
 /*
  * Ensure same dimensions
  */