myformat.sty; having it in extref.tex confuses LaTeX2HTML.
-% cfuncdesc should be called as an \begin{cfuncdesc} ... \end{cfuncdesc}
-\newcommand{\cfuncline}[3]{\item[\code{#1 #2(\varvars{#3})}]\ttindex{#2}}
-\newcommand{\cfuncdesc}[3]{\fulllineitems\cfuncline{#1}{#2}{#3}}
-\let\endcfuncdesc\endfulllineitems
-
\newcommand{\NULL}{\code{NULL}}
\chapter{Extension Reference}
\let\endfulllineitems\endlist
+% cfuncdesc should be called as an \begin{cfuncdesc} ... \end{cfuncdesc}
+\newcommand{\cfuncline}[3]{\item[\code{#1 #2(\varvars{#3})}]\ttindex{#2}}
+\newcommand{\cfuncdesc}[3]{\fulllineitems\cfuncline{#1}{#2}{#3}}
+\let\endcfuncdesc\endfulllineitems
+
% funcdesc should be called as an \begin{funcdesc} ... \end{funcdesc}
\newcommand{\funcline}[2]{\item[\code{#1(\varvars{#2})}]\ttindex{#1}}
\newcommand{\funcdesc}[2]{\fulllineitems\funcline{#1}{#2}}