...

ptbposter/ptbposter-new-engines.clo

@@ -37,10 +37,13 @@
     bold-style=TeX,
   ]
 \else
-  %%%\RequirePackage[usefilenames,weight=Regular]{firamath-otf}
-  %%%\setoperatorfont\mathsf 
-  %%%\unimathsetup{partial=upright}%
-  \RequirePackage{newtxsf}
+  \iftrue
+    \usepackage[usefilenames,weight=Regular]{firamath-otf}
+    \setoperatorfont\mathsf 
+    \unimathsetup{partial=upright}%  
+  \else
+    \usepackage{newtxsf}
+  \fi
 \fi
 
 \renewcommand*\familydefault{\sfdefault}%