Hi Adam, Adam Van Ymeren skribis: > When trying to install syslinux to a FAT partition, it requires the > mtools (particularly mcopy) to be available at runtime in PATH. [...] > + (propagated-inputs > + `(("mtools" ,mtools))) A quick inspection showed uses of “mcopy” and “mattrib”. To avoid propagating mtools, I propose the patch below. Could you check if it works for you? Thank you, Ludo’.