Using Multiple Component Roots (The First Act) 

• tell Mason to use two component roots:

PerlAddVar MasonCompRoot "main   => /usr/share/example.com/htdocs"
PerlAddVar MasonCompRoot "common => /usr/share/site-common/mason"

• put show_entry.mhtml in a more general place:

/usr/share/site-common/mason/blog/comp/show_entry.mhtml