There's two ways (I know) to handle empty directories in binary
packages:
o create a dummy file in that dir and add it to the PLIST
o create the directory with an @exec mkdir %D/path/to/dir statement

Bye,
 Thomas

-- 
Thomas Klausner - wiz@danbala.tuwien.ac.at
The man who is denied the opportunity of taking decisions of importance 
begins to regard as important the decisions he is allowed to take.
[C. Northcote Parkinson, author and historian (1909-1993)]