+dnl In Autoconf 1.8 use AC_SYS_SIGLIST_DECLARED instead of this.
+AC_COMPILE_CHECK(sys_siglist declaration in signal.h or unistd.h,
+ [#include <signal.h>
+/* NetBSD declares sys_siglist in <unistd.h>. */
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif], [char *msg = *(sys_siglist + 1);],
+ AC_DEFINE(SYS_SIGLIST_DECLARED))
+dnl Some systems have utime.h but don't declare the struct anyplace.
+AC_COMPILE_CHECK(struct utimbuf, [#ifdef TIME_WITH_SYS_TIME
+#include <sys/time.h>
+#include <time.h>
+#else
+#ifdef HAVE_SYS_TIME_H
+#include <sys/time.h>
+#else
+#include <time.h>
+#endif
+#endif
+#ifdef HAVE_UTIME_H
+#include <utime.h>
+#endif], [static struct utimbuf x; x.actime = x.modtime;],
+ AC_DEFINE(HAVE_STRUCT_UTIMBUF))