[tex4ht] Compilation fails with `program' package

[Denis Bitouzé]

Hi,

the following MCE:

--8<---------------cut here---------------start------------->8---
\documentclass{article}
\usepackage{program}
\begin{document}
\begin{program}
  Foo
\end{program}
\end{document}
--8<---------------cut here---------------end--------------->8---

compiles like a charm with `pdflatex' but, with `htlatex', it fails with
the following error:

  ┌────
  │ ! Undefined control sequence.
  │ \gt:tab ...terassignment \gt:tb \tmp:cnt =\ln:tab 
  │                                                   \space 0//
  └────

All the best.
-- 
Denis