+> target=/nix/store/xkc8jjcmms37mdsfwb5k1ykb10d8lzrh-libc.a-builder 
 +> mkdir -p /nix/store/xkc8jjcmms37mdsfwb5k1ykb10d8lzrh-libc.a-builder. 
 +> cp /build/.attr-1lf969yddshzhld7sr1vbagr07bnygg99lgl6gk5kxcnp4z9wbcq /nix/store/xkc8jjcmms37mdsfwb5k1ykb10d8lzrh-libc.a-builder