Package ‘conky-1.10.8’ in /Users/graham/nix-borg/repo/38dca4e3aa6bca43ea96d2fcc04e8229/builder/grahamc-ndnd/pkgs/os-specific/linux/conky/default.nix:130 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.

shrinking /nix/store/9vf2y10dhiljg8cc74zpnxyifijim00j-conky-1.10.8/bin/conky
shrinking /nix/store/9vf2y10dhiljg8cc74zpnxyifijim00j-conky-1.10.8/lib/conky/libimlib2.so
shrinking /nix/store/9vf2y10dhiljg8cc74zpnxyifijim00j-conky-1.10.8/lib/conky/libcairo.so
shrinking /nix/store/9vf2y10dhiljg8cc74zpnxyifijim00j-conky-1.10.8/lib/conky/libcairo_imlib2_helper.so
gzipping man pages under /nix/store/9vf2y10dhiljg8cc74zpnxyifijim00j-conky-1.10.8/share/man/
strip is /nix/store/5qj61lcvzlap87rf6blvf8p577d482bv-binutils-2.28.1/bin/strip
stripping (with command strip and flags -S) in /nix/store/9vf2y10dhiljg8cc74zpnxyifijim00j-conky-1.10.8/lib  /nix/store/9vf2y10dhiljg8cc74zpnxyifijim00j-conky-1.10.8/bin 
patching script interpreter paths in /nix/store/9vf2y10dhiljg8cc74zpnxyifijim00j-conky-1.10.8
checking for references to /tmp/nix-build-conky-1.10.8.drv-0 in /nix/store/9vf2y10dhiljg8cc74zpnxyifijim00j-conky-1.10.8...
/nix/store/9vf2y10dhiljg8cc74zpnxyifijim00j-conky-1.10.8

shrinking /nix/store/gs2hpd2cariq6hxhm2yv071p73w1j1r4-conky-1.10.8/bin/conky
shrinking /nix/store/gs2hpd2cariq6hxhm2yv071p73w1j1r4-conky-1.10.8/lib/conky/libcairo_imlib2_helper.so
shrinking /nix/store/gs2hpd2cariq6hxhm2yv071p73w1j1r4-conky-1.10.8/lib/conky/libimlib2.so
shrinking /nix/store/gs2hpd2cariq6hxhm2yv071p73w1j1r4-conky-1.10.8/lib/conky/libcairo.so
gzipping man pages under /nix/store/gs2hpd2cariq6hxhm2yv071p73w1j1r4-conky-1.10.8/share/man/
strip is /nix/store/xmpjypwjmp2qi1chs5kr0hacnh161ls4-binutils-2.28.1/bin/strip
stripping (with command strip and flags -S) in /nix/store/gs2hpd2cariq6hxhm2yv071p73w1j1r4-conky-1.10.8/lib  /nix/store/gs2hpd2cariq6hxhm2yv071p73w1j1r4-conky-1.10.8/bin
patching script interpreter paths in /nix/store/gs2hpd2cariq6hxhm2yv071p73w1j1r4-conky-1.10.8
checking for references to /build in /nix/store/gs2hpd2cariq6hxhm2yv071p73w1j1r4-conky-1.10.8...
/nix/store/gs2hpd2cariq6hxhm2yv071p73w1j1r4-conky-1.10.8