+# -*- autoconf -*-
+
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at:
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+m4_ifndef([AT_CHECK_UNQUOTED],
+ [m4_define([AT_CHECK_UNQUOTED],
+ [_AT_CHECK([$1], [$2], AS_ESCAPE(m4_dquote(m4_expand([$3])), [""]),
+ AS_ESCAPE(m4_dquote(m4_expand([$4])),[""]), [$5], [$6])])])
+
+m4_ifndef([AT_SKIP_IF],
+ [m4_define([AT_SKIP_IF],
+ [AT_CHECK([($1) \
+ && exit 77 || exit 0], [0], [ignore], [ignore])])])
+
+m4_ifndef([AT_FAIL_IF],
+ [m4_define([AT_FAIL_IF],
+ [AT_CHECK([($1) \
+ && exit 99 || exit 0], [0], [ignore], [ignore])])])
+
+m4_ifndef([AS_VAR_COPY],
+ [m4_define([AS_VAR_COPY],
+ [AS_LITERAL_IF([$1[]$2], [$1=$$2], [eval $1=\$$2])])])