\definecolor{bg}{rgb}{%s}
\pagecolor{bg}
\usepackage[%s,tightpage]{preview}
-\IfFileExists{lmodern.sty}{\usepackage{lmodern}}{\usepackage{ae,aecomp}}
\makeatletter
+\def\t@a{cmr}
+\if\f@family\t@a
+\IfFileExists{lmodern.sty}{\usepackage{lmodern}}{\usepackage{ae,aecompl}}
+\fi
\g@addto@macro\preview{\begingroup\color{bg}\special{ps::clippath fill}\color{fg}}
\g@addto@macro\endpreview{\endgroup}
\makeatother