dovecot - Jul 2014 - trying to build pigeonhole v0.4.3 sources on CentOs 6.5 - error while executing 'make'

Hello all, 

I am trying to build pigeonhole from source but get the following (only
error output) : 

../../src/lib-sieve/.libs/libdovecot-sieve.so: undefined reference to
`mail_get_backend_mail'
collect2: ld returned 1 exit status
make[3]: *** [sievec] Error 1
make[2]: *** [all-recursive] Error 1
make[1]: *** [all-recursive] Error 1
make: *** [all] Error 2 

Output further shows following warning : 

ieve-actions.c:515 implicit declaration of function
'mail_get_backend_mail' 

dovecot -n : 

# 2.2.12: /usr/local/etc/dovecot/dovecot.conf
# OS: Linux 2.6.32-431.11.2.el6.x86_64 x86_64 CentOS release 6.5 (Final)

auth_debug = yes
auth_mechanisms = plain login
auth_verbose = yes
base_dir = /var/run/dovecot/
listen = *
log_path = /var/log/dovecot.log
mail_gid = 504
mail_home = /var/mail/vhost/%d/%n
mail_location = maildir:~/
mail_uid = 503
passdb {
 args = /usr/local/etc/dovecot/dovecot-users
 driver = passwd-file
}
service auth {
 unix_listener /var/spool/postfix/private/auth {
 group = postfix
 mode = 0660
 user = postfix
 }
}
ssl = required
ssl_cert = </etc/ssl/certs/dovecot.pem
ssl_key = </etc/ssl/private/dovecot.pem
protocol lda {
 auth_socket_path = /var/run/dovecot/auth-master
 postmaster_address = postmaster at asgc-admin.be
}