php cms and rewriteRule and cakephp routes

hi

I have this folders in the host root:

app
lib
plugins
vendors
piwik

piwik is a php cms (just php no framework)

but this address (mySite.com/piwik) don't go to /piwik folder and
wan't to use rewriteRule and cakephp routes for it
I try lot of htaccess codes to resolve it but it didn't work
somthing like:

<IfModule mod_rewrite.c>
RewriteEngine on
RewriteCond %{REQUEST_URI} !^/piwik/
RewriteRule ^piwik - [L]
RewriteRule ^$ app/webroot/ [L]
RewriteRule (.*) app/webroot/$1 [L]
</IfModule>

and ....

how can resolve this problem?

thanks in advance

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