* A shell-classic: Inserted space before ] (the lexical syntax of
  shells is always resource of miracles...)

* Made searching for a catalog a little bit more cunning: If
  SGML_CATALOG_FILES is not set, try FPTOOLS_CATALOG_FILE, then
  /usr/share/sgml/CATALOG.docbkdsl, the SuSE-Linux default, don't know
  about Red Hat, Debian, etc.  This way "make dvi html pdf ps rtf"
  works out of the box, at least for me. :-)