* tests/base.at (AC_REQUIRE & AC_LANG): New test, currently failing.
avoid M4 thinking it's comments.
around broken seds. (_AC_OUTPUT_HEADERS, _AC_OUTPUT_FILES): Rename the sed labels to match the Autoconf documentation.
Be sure to read this file if you're using a non released Autoconf. * tests/tools.at (Syntax of the scripts): The non built tools are in `$top_srcdir', not `..'. (autoconf --trace): When using `-i' we need the src tree, not the build tree.