[galaxy-user] Extract genomic DNA

Hi all, Does anyone know if you can use the "Extract Genomic DNA" command with a genome not in the database? I am working with an algal genome (C. merolae) that isn't currently in the pulldown Database/Build menu. I keep getting the "Unspecified genome build" error, and am assuming that's the problem, as my other files appear to be formatted correctly (tab delimited without spaces for the intervals, same names for chromosomes in interval and fasta file, etc). Thanks! Rebecca