[strongSwan] unable to load plugin eap-ttls

[Far.Runner]

Hi,
I am using strongswan 5.0.3 on ubuntu 12.04 server, and I used
"--enable-eap-tls --enable-eap-ttls" before make. the compilation and
installation was successful, and I could see ttls plugin has been installed:
/usr/local/lib/ipsec/plugins$ ls -1|grep ttls
libstrongswan-eap-ttls.a
libstrongswan-eap-ttls.la
libstrongswan-eap-ttls.so

but it seems strongswan doesn't load eap-ttls (eap-tls does got loaded)

/usr/local/etc# ipsec start
Starting strongSwan 5.0.3 IPsec [starter]...
/usr/local/etc# ipsec statusall
Status of IKE charon daemon (strongSwan 5.0.3, Linux 3.5.0-23-generic,
i686):
  uptime: 10 seconds, since Sep 12 21:26:32 2013
  malloc: sbrk 135168, mmap 0, used 99880, free 35288
  worker threads: 8 of 16 idle, 7/1/0/0 working, job queue: 0/0/0/0,
scheduled: 0
  loaded plugins: charon aes des sha1 sha2 md5 random nonce x509 revocation
constraints pubkey pkcs1 pkcs8 pgp dnskey pem fips-prf gmp xcbc cmac hmac
attr kernel-netlink resolve socket-default stroke updown eap-tls
xauth-generic
Listening IP addresses:
  10.0.2.15
  10.1.1.2
  192.168.56.111
Connections:
          rw:  10.1.1.2...10.1.1.1  IKEv2
          rw:   local:  [10.1.1.2] uses pre-shared key authentication
          rw:   remote: [10.1.1.1] uses pre-shared key authentication
          rw:   child:  dynamic === fec1::/16 TUNNEL
Security Associations (0 up, 0 connecting):
  none
/usr/local/etc# more strongswan.conf
# strongswan.conf - strongSwan configuration file

charon {

# number of worker threads in charon
threads = 16

# send strongswan vendor ID?
# send_vendor_id = yes

plugins {

sql {
# loglevel to log into sql database
loglevel = -1

# URI to the database
# database = sqlite:///path/to/file.db
# database = mysql://user:password@localhost/database
}
}

# ...
}

pluto {

}

libstrongswan {

#  set to no, the DH exponent size is optimized
#  dh_exponent_ansi_x9_42 = no
}


I used default strongswan.conf, Could you tell me how to load eap-ttls?
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