gistfile1.txt

\usepackage{microtype}
\ifluatex
    \usepackage{fontspec}

    \newfontfeature{Microtype}{protrusion=default;expansion=default;}
    \defaultfontfeatures{Ligatures=TeX}

    \setmainfont[Numbers=OldStyle]{Linux Libertine O}
    \setsansfont[UprightFont    = *-Regular,
             ItalicFont     = *-RegularIt,
             BoldFont       = *-Semibold,
             BoldItalicFont = *-SemiboldIt]{Source Sans Pro}
    \setmonofont[Scale=MatchLowercase]{Source Code Pro}
\else
\ifxetex
    \usepackage{fontspec}
    \usepackage{xunicode}
    \usepackage{xltxtra}

    \newfontfeature{Microtype}{protrusion=default;expansion=default;}
    \defaultfontfeatures{Ligatures=tex-text}

    \setmainfont[Numbers=OldStyle]{Linux Libertine O}
    \setsansfont[UprightFont    = *-Regular,
             ItalicFont     = *-RegularIt,
             BoldFont       = *-Semibold,
             BoldItalicFont = *-SemiboldIt]{Source Sans Pro}
    \setmonofont[Scale=MatchLowercase]{Source Code Pro}

\else
    \usepackage[T1]{fontenc}
    \usepackage{lmodern}  % to make pdf searchable
\fi\fi