etc/config/src/NL_LANGINFO.cpp

// checking for nl_langinfo() in <langinfo.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.
 *
 * Copyright 1999-2007 Rogue Wave Software, Inc.
 * 
 **************************************************************************/

#include <langinfo.h>

// compile and link to make sure nl_langinfo() is not only
// declared, but also defined in one of the libraries we
// link with
int main (int argc, char *argv[])
{
    const char *d_t_fmt = nl_langinfo (D_T_FMT);

    if (argc > 1)
        return 0 != d_t_fmt;

    return 0;
}