Test for the dirfd library function (for use in some upcoming
changes).
diff --git a/configure.in b/configure.in
index 0efe7d1..ef96da3 100644
--- a/configure.in
+++ b/configure.in
@@ -2587,7 +2587,7 @@
# checks for library functions
AC_CHECK_FUNCS(alarm accept4 setitimer getitimer bind_textdomain_codeset chown \
- clock confstr ctermid execv fchmod fchown fork fpathconf ftime ftruncate \
+ clock confstr ctermid dirfd execv fchmod fchown fork fpathconf ftime ftruncate \
gai_strerror getgroups getlogin getloadavg getpeername getpgid getpid \
getpriority getresuid getresgid getpwent getspnam getspent getsid getwd \
initgroups kill killpg lchmod lchown lstat mbrtowc mkfifo mknod mktime \