anchor.diff:  
     pkgs = import <nixpkgs> {};
   
  -  systems = [ "x86_64-linux" "i686-linux" "x86_64-darwin" /* "x86_64-freebsd" "i686-freebsd" */ ];
  +  systems = [ "x86_64-linux" "i686-linux" "x86_64-darwin" ];
   
   
     jobs = rec {
  
positive.code: 
      deb_ubuntu1410i386 = makeDeb_i686 (diskImageFuns: diskImageFuns.ubuntu1410i386) [] [];
      deb_ubuntu1410x86_64 = makeDeb_x86_64 (diskImageFuns: diskImageFuns.ubuntu1410x86_64) [] [];
      deb_ubuntu1504i386 = makeDeb_i686 (diskImageFuns: diskImageFuns.ubuntu1504i386) [ "libsodium-dev" ] [ "libsodium13" ];
      deb_ubuntu1504x86_64 = makeDeb_x86_64 (diskImageFuns: diskImageFuns.ubuntu1504x86_64) [ "libsodium-dev" ] [ "libsodium13" ];
      deb_ubuntu1510i386 = makeDeb_i686 (diskImageFuns: diskImageFuns.ubuntu1510i386) [ "libsodium-dev" ] [ "libsodium13"];
      deb_ubuntu1510x86_64 = makeDeb_x86_64 (diskImageFuns: diskImageFuns.ubuntu1510x86_64) [ "libsodium-dev" ] [ "libsodium13" ];
      deb_ubuntu1604i386 = makeDeb_i686 (diskImageFuns: diskImageFuns.ubuntu1604i386) [ "libsodium-dev" ] [ "libsodium18" ];
      deb_ubuntu1604x86_64 = makeDeb_x86_64 (diskImageFuns: diskImageFuns.ubuntu1604x86_64) [ "libsodium-dev" ] [ "libsodium18" ];
      deb_ubuntu1610i386 = makeDeb_i686 (diskImageFuns: diskImageFuns.ubuntu1610i386) [ "libsodium-dev" ] [ "libsodium18" ];
  
negative.code:       meta.description = "Release-critical builds";
        constituents =
          [ tarball
            build.i686-linux
            build.x86_64-darwin
            build.x86_64-linux
            binaryTarball.i686-linux
            binaryTarball.x86_64-darwin
            binaryTarball.x86_64-linux
            deb_debian8i386
            deb_debian8x86_64
            deb_ubuntu1604i386
            deb_ubuntu1604x86_64
            rpm_fedora25i386
            rpm_fedora25x86_64
            tests.remoteBuilds
  