flimflam: Add L2TP/IPsec VPN plugin

configure.ac

Index: configure.ac
diff --git a/configure.ac b/configure.ac
index 10861aa4d04c00cbe7ccba1d5fb7758ad393b4fe..4fb6c15f426638d812decc525780c0a2daa46720 100644
--- a/configure.ac
+++ b/configure.ac
@@ -156,6 +156,26 @@ fi
 AM_CONDITIONAL(OPENVPN, test "${enable_openvpn}" != "no")
 AM_CONDITIONAL(OPENVPN_BUILTIN, test "${enable_openvpn}" = "builtin")
 
+AC_ARG_WITH(l2tpipsec, AC_HELP_STRING([--with-l2tpipsec=PROGRAM],
+        [specify location of L2TP/IPsec VPN binary]),
+	[path_l2tpipsec=${withval}])
+
+AC_ARG_ENABLE(l2tpipsec,
+	AC_HELP_STRING([--enable-l2tpipsec], [enable L2TP/IPsec support]),
+			[enable_l2tpipsec=${enableval}],
+			[enable_l2tpipsec="no"])
+if (test "${enable_l2tpipsec}" != "no"); then
+	if (test -z "${path_l2tpipsec}"); then
+		AC_PATH_PROG(L2TPIPSEC, [l2tpipsec_vpn], [],
+			$PATH:/sbin:/usr/sbin)
+	else
+		L2TPIPSEC="${path_l2tpipsec}"
+		AC_SUBST(L2TPIPSEC)
+	fi
+fi
+AM_CONDITIONAL(L2TPIPSEC, test "${enable_l2tpipsec}" != "no")
+AM_CONDITIONAL(L2TPIPSEC_BUILTIN, test "${enable_l2tpipsec}" = "builtin")
+
 AC_ARG_ENABLE(loopback,
 	AC_HELP_STRING([--enable-loopback], [enable loopback support]),
 			[enable_loopback=${enableval}], [enable_loopback="no"])