* nongnu/system/install.scm (%channels): Fix indentation spacing
Remove requirement to define 'nonguix channel on build system. * nongnu/system/install.scm (installation-os-nonfree): Add channels.scm to skeletons %channels (%channels, %channels-file) (inferior-channel, linux, linux-firmware ): Add variables.
* nongnu/system/install.scm: New file.