SBCL 1.4.3 ships with ASDF 3.3.1, and a number of Quicklisp projects have build problems as a result. Linedit, mgl, micmac, cl-string-match, and others are affected.
Here is a build failure report for yesterday. (You can ignore the gendl failures - it's a special case.) If anyone has ways to fix these projects, please do so as soon as you can - otherwise they will be removed from the January Quicklisp dist update in a few weeks.