dnl AC_WITH_DOXYGEN([ACTION-IF-FOUND[,ACTION-IF-NOT-FOUND]])
dnl Outputs:
dnl AC_SUBST: DOXYGEN HAVE_DOXYGEN
dnl AM_CONDTIONAL: HAVE_DOXYGEN
AC_DEFUN([AC_WITH_DOXYGEN],[
 HAVE_DOXYGEN="no"
 AC_PATH_PROG([DOXYGEN],[doxygen],[false])
 if test "${DOXYGEN}" = "false" ; then
  ifelse([$2], , :, [$2])
 else
  HAVE_DOXYGEN="yes"
  AC_SUBST([DOXYGEN])
  $1
 fi
 AC_SUBST([HAVE_DOXYGEN])
 AM_CONDITIONAL([HAVE_DOXYGEN],[test "${HAVE_DOXYGEN}" = "yes"])
])

dnl AC_WITH_DOT([ACTION-IF-FOUND[,ACTION-IF-NOT-FOUND]])
dnl Outputs:
dnl AC_SUBST: DOT HAVE_DOT
dnl AM_CONDITIONAL: HAVE_DOT
AC_DEFUN([AC_WITH_DOT],[
 HAVE_DOT="no"
 AC_PATH_PROG([DOT],[dot],[false])
 if test "${DOT}" = "false" ; then
  ifelse([$2], , :, [$2])
 else
  HAVE_DOT="yes"
  AC_SUBST([DOT])
  $1
 fi
AC_SUBST([HAVE_DOT])
 AM_CONDITIONAL([HAVE_DOT],[test "${HAVE_DOT}" = "yes"])
])