--- ./configure.in.orig	Fri Apr 27 11:42:45 2007
+++ ./configure.in	Sun Aug 26 23:21:56 2007
@@ -107,7 +107,7 @@
 ])
 
 dnl NetBSD, OpenBSD and FreeBSD
-AC_CHECK_HEADERS(sched.h sys/sched.h machine/cpufunc.h sys/types.h machine/pio.h machine/sysarch.h sys/cpuvar.h)
+AC_CHECK_HEADERS(sched.h sys/sched.h machine/cpufunc.h sys/types.h machine/pio.h machine/sysarch.h sys/cpuvar.h machine/apm_bios.h)
 ETR_SYSV_IPC
 ETR_UNION_SEMUN