AC_DEFUN([BB_ENABLE_DOXYGEN],
[
AC_ARG_ENABLE(doxygen, [  --enable-doxygen        enable documentation generation with doxygen (auto)])
AC_ARG_ENABLE(dot, [  --enable-dot            use 'dot' to generate graphs in doxygen (auto)])              
AC_ARG_ENABLE(html-docs, [  --enable-html-docs      enable HTML generation with doxygen (yes)], [], [ enable_html_docs=yes])              
AC_ARG_ENABLE(latex-docs, [  --enable-latex-docs     enable LaTeX documentation generation with doxygen (no)], [], [ enable_latex_docs=no])              
if test "x$enable_doxygen" = xno; then
        enable_doc=no
else 
        AC_PATH_PROG(DOXYGEN, doxygen, , $PATH)
        if test x$DOXYGEN = x; then
                if test "x$enable_doxygen" = xyes; then
                        AC_MSG_ERROR([could not find doxygen])
                fi
                enable_doc=no
        else
                enable_doc=yes
                AC_PATH_PROG(DOT, dot, , $PATH)
        fi
fi
AM_CONDITIONAL(DOC, test x$enable_doc = xyes)

if test x$DOT = x; then
        if test "x$enable_dot" = xyes; then
                AC_MSG_ERROR([could not find dot])
        fi
        enable_dot=no
else
        enable_dot=yes
fi
AC_SUBST(enable_dot)
AC_SUBST(enable_html_docs)
AC_SUBST(enable_latex_docs)
])