+> target=/nix/store/zncf90z2n1j7prxl8gkpsb6bk42vji95-mes-m2-libs-0.27.1-builder 
 +> mkdir -p /nix/store/zncf90z2n1j7prxl8gkpsb6bk42vji95-mes-m2-libs-0.27.1-builder. 
 +> cp /build/.attr-1lf969yddshzhld7sr1vbagr07bnygg99lgl6gk5kxcnp4z9wbcq /nix/store/zncf90z2n1j7prxl8gkpsb6bk42vji95-mes-m2-libs-0.27.1-builder