When I use PiCTeX with LaTeX2e the typesetter claims \fiverm is an Undefined control sequence.
PiCTeX was originally designed to be used with Plain TeX and LaTeX 2.09. LaTeX 2e emulates LaTeX 2.09 well, but does not by default load the numerous fonts used by the older version. Since PiCTeX depends on some of these old fonts being loaded, you must request that LaTeX2e load all the old fonts by using the rawfonts package.
\documentstyle[rawfonts]{article}
If you already have options listed, append it to end of the list
\documentstyle[11pt,fleqn,rawfonts]{article}
\documentclass{article} \usepackage{rawfonts}