latex and xetex support

examplelttr.tex

@@ -1,7 +1,9 @@
 \documentclass[unibrief]{scrlttr2}
 
 \usepackage[ngerman]{babel}  % change language here
-\usepackage[utf8]{inputenc}  %  whatever input encoding you use
+\ifpdftex
+   \usepackage[utf8]{inputenc}  %  whatever input encoding you use
+\fi
 \usepackage[math]{blindtext} % remove this line
                       % (unless you need \blindtext)  
 \begin{document}