[LOGDIR='${localstatedir}/log/${PACKAGE}'])
AC_SUBST([LOGDIR])])
+dnl Defines HAVE_BACKTRACE if backtrace() is declared in <execinfo.h>
+dnl and exists in libc.
+AC_DEFUN([OVS_CHECK_BACKTRACE],
+ [AC_CHECK_HEADER([execinfo.h], [AC_CHECK_FUNCS([backtrace])])])
+
dnl Checks for __malloc_hook, etc., supported by glibc.
AC_DEFUN([OVS_CHECK_MALLOC_HOOKS],
[AC_CACHE_CHECK(