--- /dev/null
+++ b/configure.ac
@@ -0,0 +1,56 @@
+# Copyright 2016 Yousong Zhou
+
+AC_PREREQ([2.67])
+AC_INIT([libudns], [0.4])
+AC_CONFIG_HEADERS([config.h])
+
+AM_INIT_AUTOMAKE([foreign])
+LT_INIT
+
+dnl Checks for programs.
+AC_PROG_CC
+AC_PROG_INSTALL
+AC_PROG_LN_S
+AC_PROG_LIBTOOL
+
+dnl Checks for library functions.
+AC_CHECK_LIB(socket, connect)
+AC_CHECK_FUNCS([malloc memset socket])
+AC_CHECK_FUNCS([getopt poll])
+AC_CHECK_FUNCS([inet_pton inet_ntop],
+			   [AC_DEFINE([HAVE_INET_PTON_NTOP], [1], [Have inet_pton and inet_ntop])])
+
+AC_ARG_ENABLE(ipv6,
+  AC_HELP_STRING([--disable-ipv6],[disable IPv6 support]),
+  [case "${enable_ipv6}" in
+    no)
+      AC_MSG_NOTICE([disabling IPv6 at user request])
+      ipv6=no
+      ;;
+    yes)
+      ipv6=yes
+	  force_ipv6=yes
+      ;;
+    *)
+      AC_MSG_ERROR([Invalid --enable-ipv6 argument \`$enable_ipv6'])
+      ;;
+    esac
+  ], [
+    dnl If nothing is specified, assume auto-detection.
+    ipv6=yes
+	force_ipv6=no
+  ]
+)
+
+if test "x$ipv6" = "xyes"; then
+  AC_CHECK_TYPE([struct sockaddr_in6],
+    [AC_DEFINE([HAVE_IPv6], [1], [Have ipv6 support])],
+    [if test "x$force_ipv6" = "xyes"; then
+      AC_MSG_ERROR([ipv6 support requested but cannot be fulfilled])
+     fi],
+    [#include <sys/socket.h>
+     #include <netinet/in.h>])
+fi
+
+AC_CONFIG_FILES([Makefile])
+AC_OUTPUT
--- /dev/null
+++ b/Makefile.am
@@ -0,0 +1,16 @@
+# Copyright 2016 Yousong Zhou
+
+lib_LTLIBRARIES=libudns.la
+libudns_la_SOURCES= udns_dn.c udns_dntosp.c udns_parse.c udns_resolver.c udns_init.c \
+	udns_misc.c udns_XtoX.c \
+	udns_rr_a.c udns_rr_ptr.c udns_rr_mx.c udns_rr_txt.c udns_bl.c \
+	udns_rr_srv.c udns_rr_naptr.c udns_codes.c udns_jran.c
+include_HEADERS= udns.h
+
+bin_PROGRAMS = dnsget rblcheck ex-rdns
+dnsget_SOURCES = dnsget.c
+rblcheck_SOURCES = rblcheck.c
+ex_rdns_SOURCES = ex-rdns.c
+dnsget_LDADD = $(top_builddir)/libudns.la
+rblcheck_LDADD = $(top_builddir)/libudns.la
+ex_rdns_LDADD = $(top_builddir)/libudns.la