X-Debbugs-CC: Denis 'GNUtoo' Carikli Title says it all. Also see the following excerpt from the build log: > make -f /tmp/guix-build-efibootmgr-17.drv-0/source/Make.deps deps SOURCES="efibootmgr.c efi.c unparse_path.c" SUBDIR_CFLAGS="-I/tmp/guix-build-efibootmgr-17.drv-0/source/src/include" > /gnu/store/4y5m9lb8k3qkb1y9m02sw9w9a6hacd16-bash-minimal-5.1.8/bin/sh: line 1: pkg-config: command not found Looks like PKG_CONFIG needs to be added to #:make-flags: . Maybe AR and CC as well. Greetings, Maxime.