Package ‘slade-git-3.1.2.2018.01.29’ in /Users/graham/nix-borg/repo/38dca4e3aa6bca43ea96d2fcc04e8229/builder/grahamc-ndnd/pkgs/applications/misc/slade/git.nix:20 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.

gcc: error: unrecognized command line option '-msse'; did you mean '-fdse'?
make[2]: *** [src/External/CMakeFiles/external.dir/build.make:1551: src/External/CMakeFiles/external.dir/dumb/it/loadptm.o] Error 1
/build/source/src/External/email/wxEmailMessage.cpp: In member function 'void wxEmailMessage::DoAddAttachment(const wxString&, wxString&) const':
/build/source/src/External/email/wxEmailMessage.cpp:102:34: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
         fread(buffer, 1, len, fp);
                                  ^
make[1]: *** [CMakeFiles/Makefile2:308: src/External/CMakeFiles/external.dir/all] Error 2
make: *** [Makefile:130: all] Error 2
builder for '/nix/store/s72hri9hsayzk1z919gm18jxpqa9qr89-slade-git-3.1.2.2018.01.29.drv' failed with exit code 2
error: build of '/nix/store/s72hri9hsayzk1z919gm18jxpqa9qr89-slade-git-3.1.2.2018.01.29.drv' failed

-- Installing: /nix/store/xfp568rg583np3zc1lhmpa22pnm02si5-slade-git-3.1.2.2018.01.29/share/icons/slade.png
-- Installing: /nix/store/xfp568rg583np3zc1lhmpa22pnm02si5-slade-git-3.1.2.2018.01.29/share/applications/slade.desktop
glibPreFixupPhase
post-installation fixup
shrinking RPATHs of ELF executables and libraries in /nix/store/xfp568rg583np3zc1lhmpa22pnm02si5-slade-git-3.1.2.2018.01.29
shrinking /nix/store/xfp568rg583np3zc1lhmpa22pnm02si5-slade-git-3.1.2.2018.01.29/bin/slade
strip is /nix/store/5qj61lcvzlap87rf6blvf8p577d482bv-binutils-2.28.1/bin/strip
stripping (with command strip and flags -S) in /nix/store/xfp568rg583np3zc1lhmpa22pnm02si5-slade-git-3.1.2.2018.01.29/bin 
patching script interpreter paths in /nix/store/xfp568rg583np3zc1lhmpa22pnm02si5-slade-git-3.1.2.2018.01.29
checking for references to /tmp/nix-build-slade-git-3.1.2.2018.01.29.drv-0 in /nix/store/xfp568rg583np3zc1lhmpa22pnm02si5-slade-git-3.1.2.2018.01.29...