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/usr/include/qpid/sys/StrError.h is in libqpidcommon2-dev 0.14-2.

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#ifndef _sys_StrError_h
#define _sys_StrError_h

/*
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 *
 */

#include <string>
#include "qpid/CommonImportExport.h"

namespace qpid {
namespace sys {

/** Get the error message for a system number err, e.g. errno. */
QPID_COMMON_EXTERN std::string strError(int err);

}} // namespace qpid

#endif  // _sys_StrError_h