+
+dnl ----------------------------------------------------------------
+dnl PF_INET6 support requires getaddrinfo
+dnl PF_UNIX may use getaddrinfo in available
+AC_CHECK_FUNCS( getaddrinfo )
+
+if test $ac_cv_func_getaddrinfo = no ; then
+ if test $ol_enable_ipv6 = yes ; then
+ AC_MSG_ERROR([IPv6 support requires getaddrinfo()])
+ fi
+ ol_enable_ipv6=no
+fi
+
+if test $ol_enable_unix != no ; then
+ AC_CHECK_HEADERS( sys/un.h )
+
+ if test $ol_enable_unix = auto ; then
+ ol_enable_unix=$ac_cv_header_sys_un_h
+ elif test $ac_cv_header_sys_un_h = no ; then
+ AC_MSG_ERROR([UNIX domain support requires sys/un.h])
+ fi
+fi
+