problem with apache+modssl+openssl on solaris 2.8

[Lamia Chaffai, Agence Tunisienne Internet]

I've tried installing different versions of apache, openssl, and mod_ssl but I always have the same problem while building  apache :
./ apaci      alloc.c
 undeclared : STDOUT_FILENO, STDIN_FILENO, STDERR_FILENO for function 'spawn_child_core'

I have tried desperately the following versions :

• apache_1.3.19 ; mod_ssl-2.8.2, openssl-0.9.6
• apache_1.3.12, mod_ssl-2.6.6, openssl-0.9.6
• apache_1.3.17, mod_ssl-2.8.0, openssl-0.9.6

Do you have any idea of the origin of this problem   :-)
Many thanks
Lamia