Good morning guix When I try to patch tar I get "(vm-run "VM: Stack overflow" ())", probably, because it tries to use patch but it does not yet exist and I get the chicken-egg problem. I created patch-final in commencement.scm and added it to %boot6-inputs which are used to build %final-inputs. But I am still not able to patch tar. After Ludo's suggestion I post the patch and the backtrace. http://paste.lisp.org/display/147854 Any ideas? Manolis