-#include <libpspp/compiler.h>
-#include <libpspp/misc.h>
-#include <math/coefficient.h>
-#include <math/ts/innovations.h>
+#include <math.h>
+#include <stdlib.h>
+
+#include "libpspp/compiler.h"
+#include "libpspp/misc.h"
+#include "math/coefficient.h"