scatter/@pre marker code/.append style={
   \pgfmathsetmacro{\zzz}{1+0.2},  % works not!
/pgfplots/cube/size z=\zzz
},

with import <nixpkgs> {};

let

  executables = [
    "a2ping"
    ... 100 hundred other executables ...
    "yplan"
  ];

  fhs = buildFHSUserEnv {
    name = "texlive-fhs";
    targetPkgs = pkgs: with pkgs; [
      fontconfig
      freetype
      perl
      tk
      wget
    ];
    runScript = "";
    profile = ''
      export PATH="/opt/texlive/current/bin/x86_64-linux''${PATH:+:$PATH}"
    '';
  };

  makeFhsWrapper = name: writeShellScriptBin name ''
    exec "${fhs}/bin/texlive-fhs" "${name}" "$@"

\documentclass{article}
\DeclareFontFamily{TU}{sourcecode-variable}{}
\newcommand\DeclareSourceVariable[2]{%
  \DeclareFontShape{TU}{sourcecode-variable}{#1}{n}{%
    <-> \UnicodeFontFile{SourceCodeVariable-Roman.otf}{\UnicodeFontTeXLigatures axis={weight=#2};}%
  }{}%
  \DeclareFontShape{TU}{sourcecode-variable}{#1}{it}{%
    <-> \UnicodeFontFile{SourceCodeVariable-Italic.otf}{\UnicodeFontTeXLigatures axis={weight=#2};}%
  }{}%
}
\DeclareSourceVariable{ul}{200}
\DeclareSourceVariable{el}{250}
\DeclareSourceVariable{l}{300}

    \node[minimum width=2.6cm,minimum height=2.0cm,inner sep=0pt, rounded corners=\blockroundedcorners, draw] (textD) {\textbf{Evaluation}\\ asdasda};

\special{color push XC@RedSpot}
\special{color push 1}
\special{color push setcolor}
\put(0,0){\line(1,1){10}}
\put(0,10){\line(1,-1){10}}
\special{color pop}\special{color pop} \special{color pop}

\cs_new_protected:Npn \@@_backend_select_separation:nn #1#2
  {
    \@@_backend_select:n {#1}
    \@@_backend_select:n {#2}
    \@@_backend_select:n { selectcolor }
  }

\special{color push mycolorspec blue 1}
a
\special{color pop}

b

\bye

TeXDict begin 1 0 bop blue 1 TeXcolormycolorspec 166
83 a Fa(a)p Black 166 183 a(b)1929 5539 y(1)p eop end

\special{!
TeXDict begin /TeXcolormycolorspec {pop pop 1 0 0 setrgbcolor} def end
}
\special{color push mycolorspec /blue 1}
a
\special{color pop}

b

\bye

\documentclass{beamer}

\usefonttheme[onlymath]{serif}
\usefonttheme{seriff}


\begin{document}

\begin{frame}
	abc x $x$
\end{frame}

\end{document}

\documentclass{beamer}

\makeatletter
  \def\beamer@tsfont{\rmfamily}
  \def\beamer@sfont{\rmfamily}
  \def\mathfamilydefault{\rmdefault}
  \beamer@sansmathfalse
\makeatother


\usefonttheme{serif}


\begin{document}

\begin{frame}
	abc x $x$
\end{frame}

\end{document}

\begin{filecontents*}{spot_color.pro}
TeXDict begin
/RedSpotCMYK [0 1 0 0] def
/RedSpotSpot (RedSpot) def
/RedSpotDef RedSpotCMYK aload pop RedSpotSpot findcmykcustomcolor def
/XC@RedSpot{RedSpotDef 1.0 setcustomcolor}bind def
end
\end{filecontents*}

\documentclass{article}
\usepackage{eepic}
\special{!
TeXDict begin /TeXcolorsetcolor {setcolor} def end
}
\AtBeginDvi{\special{header=spot_color.pro}}
\begin{document}
\setlength{\unitlength}{1mm}
abc
\begin{picture}(10,10)
\special{color push setcolor XC@RedSpot 1.0}

\begin{filecontents*}[overwrite]{spot_color.pro}
TeXDict begin
/RedSpotCMYK [0 1 0 0] def
/RedSpotSpot (RedSpot) def
/RedSpotDef RedSpotCMYK aload pop RedSpotSpot findcmykcustomcolor def
end
\end{filecontents*}
\PassOptionsToPackage{dvipsnames}{xcolor}
\documentclass{article}
\usepackage{eepic}
\special{!
TeXDict begin /TeXcolorsetspotcolor {setcustomcolor} def end
}
\AtBeginDvi{\special{header=spot_color.pro}}
\begin{document}
\setlength{\unitlength}{1mm}
abc
\begin{picture}(10,10)
\special{color push setspotcolor RedSpotDef 1.0}

\begin{filecontents*}[overwrite]{spot_color.pro}
TeXDict begin
/RedSpotDef [0 1 0 0]  aload pop (RedSpot) findcmykcustomcolor def
/TeXcolorsetspotcolor {setcustomcolor} def
end
\end{filecontents*}
\PassOptionsToPackage{dvipsnames}{xcolor}
\documentclass{article}
\usepackage{eepic}
\AtBeginDvi{\special{header=spot_color.pro}}
\begin{document}
\setlength{\unitlength}{1mm}
abc
\begin{picture}(10,10)
\special{color push setspotcolor RedSpotDef 1.0}
\put(0,0){\line(1,1){10}}
\put(0,10){\line(1,-1){10}}

GS>/findrgbcustomcolor where ==
true

6 0 obj
[/Indexed/DeviceRGB 3<000000ff000000ff000000ff>]
endobj
7 0 obj
[/CalGray<</WhitePoint[.95505 1 1.089]/Gamma 2.222>>]
endobj