2.0.15 compile problem under HP/UX 10.20

[Jan Zeller <jan@quake.ethz.ch>]

dear list,

I would like to compile openldap 2.0.15 on HP/UX. I've tried to do it like that 
:

./configure  --prefix=/usr/local/openldap-2.0.15 --enable-debug --enable-syslog 
--disable-ipv6 --with-tls --enable-slurpd

make depend is running fine but when once launching make it complains about that

gcc -g -O2 -I../../include -I../../include -I/usr/local/ssl/include 
-I/usr/local/BerkeleyDB-3.3.11/include -c util-int.c  -fPIC -DPIC -o 
.libs/util-int.lo
util-int.c: In function `ldap_pvt_gethostbyname_a':
util-int.c:177: `h_errno' undeclared (first use in this function)
util-int.c:177: (Each undeclared identifier is reported only once
util-int.c:177: for each function it appears in.)
*** Error exit code 1g

Stop.
*** Error exit code 1

I am using gcc 3.0.1. 
Can someone help me ?

thanks,

Jan