If I build manually it works: --8<---------------cut here---------------start------------->8--- > sbcl --no-userinit * (require :asdf) ("ASDF" "asdf" "UIOP" "uiop") * (asdf:load-asd (truename "/gnu/store/pr52bqxa2kf1n8jadhzw4rjsl3jjk6yl-sbcl-cl-environments-0.2.3-1.bbcd958/share/common-lisp/sbcl/cl-environments/cl-environments.asd")) # # * (asdf:compile-system "cl-environments") WARNING: System definition file #P"/home/ambrevar/common-lisp/collectors/collectors.asd" contains definition for system "collectors-test". Please only define "collectors" and secondary systems with a name starting with "collectors/" (e.g. "collectors/test") in that file. WARNING: System definition file #P"/gnu/store/n3sgz03ylnxprkbzj8f20zxvpldfxbcl-cl-symbol-munger-0.0.1-1.97598d4/share/common-lisp/source/cl-symbol-munger/symbol-munger.asd" contains definition for system "symbol-munger-test". Please only define "symbol-munger" and secondary systems with a name starting with "symbol-munger/" (e.g. "symbol-munger/test") in that file. T --8<---------------cut here---------------end--------------->8--- The above builds against a local version of collectors, not sure that's related though. -- Pierre Neidhardt https://ambrevar.xyz/