* gnu/build/file-systems.scm: Import (guix build syscalls) when 'mount' is not defined. * gnu/system.scm (operating-system-activation-script): Include (guix build syscalls) module in derivation.
* gnu/build/file-systems.scm: Import (guix build syscalls) when 'mount' is not defined. * gnu/system.scm (operating-system-activation-script): Include (guix build syscalls) module in derivation.