I apologize for the amateur question, but I'm really looking forward to using this on a Buffalo Linkstation LS-VL NAS with Optware, however I'm having an issue with the install.

The NAS comes with a preloaded webserver, lighttpd I believe. PHP Version 5.2.10-pl0-gentoo with fastcgi enabled. I've followed the installation, but navigating to http://192.168.1.111:81/bbs results in the below error. I believe this may have something to do with the way the webserver was preinstalled, but I'm not sure where to look. Any help or suggestions would be appreciated!

Warning: require_once(DIR/composer/autoload_real.php) [function.require-once]: failed to open stream: No such file or directory in /www/htdocs/bbs/vendor/autoload.php on line 5

Fatal error: require_once() [function.require]: Failed opening required 'DIR/composer/autoload_real.php' (include_path='.:/usr/share/php5:/usr/share/php') in /www/htdocs/bbs/vendor/autoload.php on line 5

There is the wiki page about Web Servers, that lists configurations for different web servers, including lighttpd. Did you try that already?

If that isn't the problem then we might have run into this composer issue that is apparently related to PHP 5.2.

Yes, the LS-VL comes with apache 1.3 prebuilt on port 80 but I'm not able to change it since it hosts the Admin CPanel.
Lighttpd is provided on port 81, which is where I get the error described above
I installed another lighttpd instance on port 8082 (from ipkg) but I get a server error trying to view bbs/index.php (or others) yet any other .php page works. Enabled fastCGI and mod_rewrite and didn't work.

My guess I need either apache2, which might break the NAS setup, or update php5 to 5.3 which I don't have an ipkg for :(

Still trying!

Could you try to install the slightly older 1.0 version? See http://projekte.textmulch.de/bicbucstriim/downloads/BicBucStriim-1.0.0.zip
This one shouldn't have the updated composer issue. If that is the problem I could try to revert the composer update.

Got the same error using v1.0:
Warning: require_once(DIR/composer/autoload_real.php) [function.require-once]: failed to open stream: No such file or directory in /www/htdocs/bbs/vendor/autoload.php on line 5

Fatal error: require_once() [function.require]: Failed opening required 'DIR/composer/autoload_real.php' (include_path='.:/usr/share/php5:/usr/share/php') in /www/htdocs/bbs/vendor/autoload.php on line 5

However, BBS 0.93 gives me the error:
Warning: Unexpected character in input: ' (ASCII=92) state=1 in /www/htdocs/bbs/vendor/autoload.php on line 13

Warning: Unexpected character in input: ' (ASCII=92) state=1 in /www/htdocs/bbs/vendor/autoload.php on line 13

Parse error: syntax error, unexpected T_STRING in /www/htdocs/bbs/vendor/autoload.php on line 13

Could this have something to do with my usr/share/php5 folder being empty? I have a usr/lib/php5 folder with some contents. I already tried copying it to /usr/share/php5 with no luck.

No, I don't think so. Apparently PHP 5.2 and Composer have a lot of problems and nobody noticed before. Probaby most people are already on 5.4.
If you still want to test, I could provide you with a special version of BBS 1.1. that has composer code for PHP 5.2. BUT: I was not able to test this, since all machines here are already setup differently. The 5.2 version is here: http://projekte.textmulch.de/bicbucstriim/downloads/BicBucStriim-52-1.1.0.zip

PS: with the next version, 1.2, BBS will officially migrate to PHP 5.3 due to some other dependency.

And your 5.2 version works! Well, sort of. I have the Admin page but can't get anywhere else. Most likely a permissions issue on my end.

Anyway, I truly appreciate you taking your time to help! Now I need to figure out how to update my PHP for your next release :)

Oh, thank you fo testing, good to hear that it works. Calling .../installcheck.php might help to figure out the other problems.

Had to do chmod -R ga+w data per your instructions (forgot that bit). I need to configure the Calibre database as well, but I won't be able to until tonight. If you wanted me to test anything additional while I can, I would be more than willing. Otherwise I think you solved the issue (for now)! Thanks!!