-if test "x$enable_direct_io" = "xyes"; then
-AC_CACHE_CHECK([for O_DIRECT flag to open(2)],rrd_cv_HAVE_OPEN_O_DIRECT,[
-AC_TRY_COMPILE([
-#ifdef HAVE_UNISTD_H
-#include <unistd.h>
-#endif
-#ifdef HAVE_FCNTL_H
-#include <fcntl.h>
-#endif],
-[int fd = open("/dev/null", O_DIRECT);],
-rrd_cv_HAVE_OPEN_O_DIRECT=yes,rrd_cv_HAVE_OPEN_O_DIRECT=no)])
- if test "x$rrd_cv_HAVE_OPEN_O_DIRECT" = "xyes"; then
- AC_DEFINE(USE_DIRECT_IO,1,[Whether the open(2) accepts O_DIRECT])
- else
- enable_direct_io="no"
- fi
-else
- enable_direct_io="no"
-fi
-