help building courier-imap 1.0 on potato

[Jaume Teixi <teixi@6tems.com>]

I'm trying to build courier-imap 1.0 on a potato server,
but compilation fails here:

---
gcc -DHAVE_CONFIG_H -I. -I. -I.     -g -O2 -Wall -I.. -I./.. -c
authldap.c
gcc -DHAVE_CONFIG_H -I. -I. -I.     -g -O2 -Wall -I.. -I./.. -c
preauthldap.c
echo "#define AUTHLDAPRC \"/etc/courier-imap.authldaprc\"" >authldaprc.h
gcc -DHAVE_CONFIG_H -I. -I. -I.     -g -O2 -Wall -I.. -I./.. -c
authldaplib.c
authldaplib.c: In function `copy_value':
authldaplib.c:340: dereferencing pointer to incomplete type
authldaplib.c: In function `ldaperror':
authldaplib.c:372: warning: implicit declaration of function
`NAME_ERROR'
authldaplib.c: In function `ldapopen':
authldaplib.c:430: dereferencing pointer to incomplete type
make[2]: *** [authldaplib.o] Error 1
make[2]: Leaving directory `/usr/src/courier-imap-1.0/authlib'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/usr/src/courier-imap-1.0'
make: *** [build-stamp] Error 2
---

how to handle this ?

thanks,
jaume