Fehler, wenn sanserif math mit pdfLaTeX

ptbposter/ptbposter-old-engines.clo

@@ -12,8 +12,15 @@
 \ifPTB@serif
   \RequirePackage{qpxmath}
 \else
-  \renewcommand*\familydefault{\sfdefault} 
-  \RequirePackage{sfmath}
+  %%%\renewcommand*\familydefault{\sfdefault} 
+  %%%\RequirePackage{sfmath}
+  \@latex@error{works only with `LuaLaTeX' or `XeLaTeX'}{%
+    type:\MessageBreak 
+    lualatex \jobname.tex\MessageBreak
+    or\MessageBreak 
+    xelatex \jobname.tex
+  }%
+  \@@end 
 \fi
 
 \endinput