diff --git a/configure.ac b/configure.ac
index 4409d20..27d26ef 100755
--- a/configure.ac
+++ b/configure.ac
@@ -219,15 +219,14 @@
 AC_ARG_ENABLE(tcp-zebra,
 [  --enable-tcp-zebra      enable TCP/IP socket connection between zebra and protocol daemon])
 AC_ARG_ENABLE(opaque-lsa,
-[  --enable-opaque-lsa     enable OSPF Opaque-LSA with OSPFAPI support (RFC2370)])
+  AC_HELP_STRING([--disable-opaque-lsa],[do not build OSPF Opaque-LSA with OSPFAPI support (RFC2370)]))
 AC_ARG_ENABLE(ospfapi,
-[  --disable-ospfapi       do not build OSPFAPI to access the OSPF LSA Database, 
-                          (this is the default if --enable-opaque-lsa is not set)])
+[  --disable-ospfapi       do not build OSPFAPI to access the OSPF LSA Database])
 AC_ARG_ENABLE(ospfclient,
 [  --disable-ospfclient    do not build OSPFAPI client for OSPFAPI, 
                           (this is the default if --disable-ospfapi is set)])
 AC_ARG_ENABLE(ospf-te,
-[  --enable-ospf-te        enable Traffic Engineering Extension to OSPF])
+  AC_HELP_STRING([--disable-ospf-te],[disable Traffic Engineering Extension to OSPF]))
 AC_ARG_ENABLE(multipath,
 [  --enable-multipath=ARG  enable multipath function, ARG must be digit])
 AC_ARG_ENABLE(user,
@@ -292,11 +291,11 @@
   AC_DEFINE(HAVE_TCP_ZEBRA,,Use TCP for zebra communication)
 fi
 
-if test "${enable_opaque_lsa}" = "yes"; then
+if test "${enable_opaque_lsa}" != "no"; then
   AC_DEFINE(HAVE_OPAQUE_LSA,,OSPF Opaque LSA)
 fi
 
-if test "${enable_ospf_te}" = "yes"; then
+if test "${enable_ospf_te}" != "no"; then
   AC_DEFINE(HAVE_OPAQUE_LSA,,OSPF Opaque LSA)
   AC_DEFINE(HAVE_OSPF_TE,,OSPF TE)
 fi