anchor.diff:      # Setting LD causes `configure' and `make' to disagree about which linker
       # to use: `configure' wants `gcc', but `make' wants `ld'.
       unset LD
  -  ''
  -  # Upstream build system does not support static build, so we fall back
  -  # on fragile patching of configure script.
  -  #
  -  # libedit is found by pkg-config, but without --static flag, required
  -  # to get also transitive dependencies for static linkage, hence sed
  -  # expression.
  -  #
  -  # Kerberos can be found either by krb5-config or by fall-back shell
  -  # code in openssh's configure.ac. Neither of them support static
  -  # build, but patching code for krb5-config is simpler, so to get it
  -  # into PATH, libkrb5.dev is added into buildInputs.
  -  + optionalString stdenv.hostPlatform.isStatic ''
  -    sed -i "s,PKGCONFIG --libs,PKGCONFIG --libs --static,g" configure
  -    sed -i 's#KRB5CONF --libs`#KRB5CONF --libs` -lkrb5support -lkeyutils#g' configure
  -    sed -i 's#KRB5CONF --libs gssapi`#KRB5CONF --libs gssapi` -lkrb5support -lkeyutils#g' configure
     '';
   
     # I set --disable-strip because later we strip anyway. And it fails to strip
  
positive.code:     ++ optional (!linkOpenssl) "--without-openssl"
      ++ extraConfigureFlags;
  
    buildFlags = [ "SSH_KEYSIGN=ssh-keysign" ];
  
    enableParallelBuilding = true;
  
negative.code:   doCheck = true;
    enableParallelChecking = false;
    checkInputs = optional (!stdenv.isDarwin) hostname;
    preCheck = lib.optionalString (stdenv.hostPlatform == stdenv.buildPlatform) ''
      # construct a dummy HOME
      export HOME=$(realpath ../dummy-home)
      mkdir -p ~/.ssh
  