Package ‘grobi-0.3.0’ in /Users/graham/nix-borg/repo/38dca4e3aa6bca43ea96d2fcc04e8229/builder/grahamc-ndnd/pkgs/tools/X11/grobi/default.nix:18 is not supported on ‘x86_64-darwin’, refusing to evaluate.

a) For `nixos-rebuild` you can set
  { nixpkgs.config.allowBroken = true; }
in configuration.nix to override this.

b) For `nix-env`, `nix-build`, `nix-shell` or any other Nix command you can add
  { allowBroken = true; }
to ~/.config/nixpkgs/config.nix.

strip is /nix/store/5qj61lcvzlap87rf6blvf8p577d482bv-binutils-2.28.1/bin/strip
stripping (with command strip and flags -S) in /nix/store/lqg60myhqfvyhy0r1ry2qfy8nlmsn5lc-grobi-0.3.0-bin/bin 
patching script interpreter paths in /nix/store/lqg60myhqfvyhy0r1ry2qfy8nlmsn5lc-grobi-0.3.0-bin
checking for references to /tmp/nix-build-grobi-0.3.0.drv-0 in /nix/store/lqg60myhqfvyhy0r1ry2qfy8nlmsn5lc-grobi-0.3.0-bin...
shrinking RPATHs of ELF executables and libraries in /nix/store/9w6xpm6dcfj7g42w7xz78lxpg3w7nwff-grobi-0.3.0
strip is /nix/store/5qj61lcvzlap87rf6blvf8p577d482bv-binutils-2.28.1/bin/strip
patching script interpreter paths in /nix/store/9w6xpm6dcfj7g42w7xz78lxpg3w7nwff-grobi-0.3.0
/nix/store/9w6xpm6dcfj7g42w7xz78lxpg3w7nwff-grobi-0.3.0/share/go/src/github.com/fd0/grobi/vendor/github.com/jessevdk/go-flags/check_crosscompile.sh: interpreter directive changed from "/bin/bash" to "/nix/store/yq03c2ny43mc24j7dq5riznzb09ddhpq-bash-4.4-p12/bin/bash"
checking for references to /tmp/nix-build-grobi-0.3.0.drv-0 in /nix/store/9w6xpm6dcfj7g42w7xz78lxpg3w7nwff-grobi-0.3.0...
/nix/store/lqg60myhqfvyhy0r1ry2qfy8nlmsn5lc-grobi-0.3.0-bin

strip is /nix/store/xmpjypwjmp2qi1chs5kr0hacnh161ls4-binutils-2.28.1/bin/strip
stripping (with command strip and flags -S) in /nix/store/mg1jxsgycvbvs8b5mz18l8rjy41bkydb-grobi-0.3.0-bin/bin
patching script interpreter paths in /nix/store/mg1jxsgycvbvs8b5mz18l8rjy41bkydb-grobi-0.3.0-bin
checking for references to /build in /nix/store/mg1jxsgycvbvs8b5mz18l8rjy41bkydb-grobi-0.3.0-bin...
shrinking RPATHs of ELF executables and libraries in /nix/store/yv2wnnklqgkrczwzf6ifxlf82g8kw5rv-grobi-0.3.0
strip is /nix/store/xmpjypwjmp2qi1chs5kr0hacnh161ls4-binutils-2.28.1/bin/strip
patching script interpreter paths in /nix/store/yv2wnnklqgkrczwzf6ifxlf82g8kw5rv-grobi-0.3.0
/nix/store/yv2wnnklqgkrczwzf6ifxlf82g8kw5rv-grobi-0.3.0/share/go/src/github.com/fd0/grobi/vendor/github.com/jessevdk/go-flags/check_crosscompile.sh: interpreter directive changed from "/bin/bash" to "/nix/store/7fxbh1yhagvwbdrmdyyy5ghcjhwjndhs-bash-4.4-p12/bin/bash"
checking for references to /build in /nix/store/yv2wnnklqgkrczwzf6ifxlf82g8kw5rv-grobi-0.3.0...
/nix/store/mg1jxsgycvbvs8b5mz18l8rjy41bkydb-grobi-0.3.0-bin