The LoadModule directive is part of the dso support in Apache. It looks like you compiled it into your Apache, with the --enable-module=so option, but your compiled Apache doesn't seem to have support for it. Perhaps you need to provide it with the correct libraries for dso support on Solaris.

I would recommend getting Apache running on its own first. And check that it has dso support by running the following command:

httpd -L | grep LoadModule
[download]

If that doesn't return anything, then you have not successfully compiled dso support into Apache.

Once you have Apache installed with dso support, then use the APXS method of installing mod_perl. I find it is much easier that way.

Cheers,

Cees