dnl detect tools to build documentation
ASCIIDOC_TOOL="none"
if test "x$enable_documentation" = xyes; then
- AC_PATH_PROG([XMLTO], [xmlto], [xmlto])
+ AC_PATH_PROG([XMLTO], [xmlto])
+ if test -z "$XMLTO"; then
+ AC_MSG_ERROR([cannot find xmlto, cannot build documentation])
+ fi
+
AC_PATH_PROG([GZIP], [gzip], [gzip])
AC_PATH_PROG([MV], [mv], [mv])
AC_PROG_SED