(P_): Define it here (as well as elsewhere).
#ifndef EMACS_ATIMER_H
#define EMACS_ATIMER_H
-/* Building alloca.o includes us, and we need lisp.h for the P_ macro
- in that case. */
-#include "lisp.h"
+/* Declare the prototype for a general external function. */
+#if defined (PROTOTYPES) || defined (WINDOWSNT)
+#define P_(proto) proto
+#else
+#define P_(proto) ()
+#endif
+
#include "systime.h" /* for EMACS_TIME */
/* Forward declaration. */