Forgot to answer your question: /tmp/guix-build-sbcl-1.5.9.drv-0/sbcl-1.5.9/obj/from-xc/src/ exists but not the `assembly` subdir.
Forgot to answer your question: /tmp/guix- build-sbcl- 1.5.9.drv- 0/sbcl- 1.5.9/obj/ from-xc/ src/ exists but not the `assembly` subdir.