Table of Contents
Apache
mod_ssl
OpenSSL
OpenLDAP
Perl
Digest::MD5 is usually problematical on modern Linux distros because Perl 5.8 includes Digest::MD5 already and some old version of Digest::MD5 has big problems with new Perl. You can simple outcomment Digest::MD5 in src/modules/Makefile.
Gettext causes sometimes trouble because version 1.0.0 has a different export behaviour than 1.0.1. The result of this small "bug" is that OpenCA doesn't work with gettext 1.0.0. Please update your gettext or remove it from the system.
CGI::Session is sometimes problematical if you use OpenCA's access control. If you login then OpenCA sends you a cookie and write some session data to the disk. Old version of CGI::Session doesn't flush the data automatically and so the data files on the server disk are empty. OpenCA::AC includes some fixes but it is strongly recommended to have only CGI::Session 3.92+ on your system.
i386 with Linux, FreeBSD, OpenBSD and NetBSD
UltraSparc with Solaris 8 and Linux
PowerPC with AIX