When auth-ldap (experimental) is enabled as a module (shared), and mod_ldap is enabled, the generated httpd.conf has the LoadModule statements in the wrong order. First the auth-ldap module is loaded which crashes in the load process because mod_ldap is not loaded. Exchanging the LoadModule lines resolves the issue. When backtracking this, I found out that the configure script processes auth-ldap first, and then processes the mod_ldap.
A fix for this was just committed. Thanks for your report, and thanks for using Apache!