this derivation will be built:
  /nix/store/6ajgaxy5f28h62n5xl66g0ppfrkj1dpd-niks3-tests-1.4.0.drv
building '/nix/store/6ajgaxy5f28h62n5xl66g0ppfrkj1dpd-niks3-tests-1.4.0.drv' on 'ssh-ng://customer@mac02'
building '/nix/store/6ajgaxy5f28h62n5xl66g0ppfrkj1dpd-niks3-tests-1.4.0.drv'
niks3-tests-1.4.0> Running phase: unpackPhase
niks3-tests-1.4.0> unpacking source archive /nix/store/p09agj8nv6bg9sy75jimlb56q8ga8prf-source
niks3-tests-1.4.0> source root is source
niks3-tests-1.4.0> Running phase: patchPhase
niks3-tests-1.4.0> Running phase: updateAutotoolsGnuConfigScriptsPhase
niks3-tests-1.4.0> Running phase: configurePhase
niks3-tests-1.4.0> Running phase: buildPhase
niks3-tests-1.4.0> buildPhase completed in 32 seconds
niks3-tests-1.4.0> Running phase: installPhase
niks3-tests-1.4.0> Running phase: fixupPhase
niks3-tests-1.4.0> checking for references to /nix/var/nix/builds/nix-97668-3344620112/ in /nix/store/77q5v5fdfvalzmlf2ki2960rnj887si1-niks3-tests-1.4.0...
niks3-tests-1.4.0> patching script interpreter paths in /nix/store/77q5v5fdfvalzmlf2ki2960rnj887si1-niks3-tests-1.4.0
niks3-tests-1.4.0> stripping (with command strip and flags -S) in  /nix/store/77q5v5fdfvalzmlf2ki2960rnj887si1-niks3-tests-1.4.0/bin
could not copy /nix/store/77q5v5fdfvalzmlf2ki2960rnj887si1-niks3-tests-1.4.0: error: Nix daemon disconnected unexpectedly (maybe it crashed?)
error: some outputs are unexpectedly invalid