A number of projects fail to build with the latest ASDF from git. A few of them seem to be related to defining a custom file component class that has a custom file type. For example, see jwacs and portable aserve:
http://report.quicklisp.org/jwacs/2012-12-19/failtail.txt
http://report.quicklisp.org/portableaserve/2012-12-19/failtail.txt
For jwacs, the file component has a type of "js", and for portableaserve, it has a type of "cl", but it seems like ASDF is looking for different file names.
FSet also fails with this error:
Error while trying to load definition for system fset from pathname /[...elided...]/fset-20121219-svn/fset.asd:
Invalid initialization argument: :PARENT in call for class #<STANDARD-CLASS SYSTEM>.
Zach