next_posts_link Templage Tag fails with .htaccess rewrite

The template tags next_posts_link and previous_posts_link should work from the index.php template… BUT…

If you are doing an .htaccess rewrite to arrive at your index.php, these tags will fail.

The function responsible may be:

get_pagenum_link() in template-function-links.php (at line 389).

I noticed this line of code:

$qstr = wp_specialchars($_SERVER['REQUEST_URI'])

The value returned by this line is what appears to be buttering up the link that is returned by next_posts_link.

For example, if your site is www.example.com, and you use htaccess to direct visitors to:

example.com/my-dir/wp-dir/
(where wp-dir is wp install directory)

the link returned by next_posts_link will look like this:

http://www.examle.com/my-dir/wp-dir/my-dir/wp-dir/index.php?paged=5

Obviously this will return a 404 error — so you will not be able to navigate through your posts.

I discovered this problem recently and am still looking for a solution.