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    copied!<p>Seems to be for locale support on my box:</p> <pre><code>$ cat whytime.cc #define _TIME_H_ #include &lt;iostream&gt; int main() { std::cout &lt;&lt; "hello, world" &lt;&lt; std::endl; return 0; } $ g++ -Wall -Werror -Wextra -ansi -o whytime whytime.cc &amp;&amp; ./whytime In file included from /usr/include/c++/4.2.1/cwchar:52, from /usr/include/c++/4.2.1/bits/postypes.h:46, from /usr/include/c++/4.2.1/iosfwd:49, from /usr/include/c++/4.2.1/ios:43, from /usr/include/c++/4.2.1/ostream:45, from /usr/include/c++/4.2.1/iostream:45, from whytime.cc:2: /usr/include/c++/4.2.1/ctime:66: error: ‘::clock_t’ has not been declared /usr/include/c++/4.2.1/ctime:68: error: ‘::tm’ has not been declared /usr/include/c++/4.2.1/ctime:70: error: ‘::clock’ has not been declared /usr/include/c++/4.2.1/ctime:71: error: ‘::difftime’ has not been declared /usr/include/c++/4.2.1/ctime:72: error: ‘::mktime’ has not been declared /usr/include/c++/4.2.1/ctime:73: error: ‘::time’ has not been declared /usr/include/c++/4.2.1/ctime:74: error: ‘::asctime’ has not been declared /usr/include/c++/4.2.1/ctime:75: error: ‘::ctime’ has not been declared /usr/include/c++/4.2.1/ctime:76: error: ‘::gmtime’ has not been declared /usr/include/c++/4.2.1/ctime:77: error: ‘::localtime’ has not been declared /usr/include/c++/4.2.1/ctime:78: error: ‘::strftime’ has not been declared In file included from /usr/include/c++/4.2.1/locale:46, from /usr/include/c++/4.2.1/bits/ostream.tcc:46, from /usr/include/c++/4.2.1/ostream:572, from /usr/include/c++/4.2.1/iostream:45, from whytime.cc:2: /usr/include/c++/4.2.1/bits/locale_facets.tcc: In member function ‘_InIter std::time_get&lt;_CharT, _InIter&gt;::_M_extract_via_format(_InIter, _InIter, std::ios_base&amp;, std::_Ios_Iostate&amp;, tm*, const _CharT*) const’: /usr/include/c++/4.2.1/bits/locale_facets.tcc:1839: error: invalid use of incomplete type ‘struct tm’ /usr/include/wchar.h:152: error: forward declaration of ‘struct tm’ /usr/include/c++/4.2.1/bits/locale_facets.tcc:1846: error: invalid use of incomplete type ‘struct tm’ /usr/include/wchar.h:152: error: forward declaration of ‘struct tm’ /usr/include/c++/4.2.1/bits/locale_facets.tcc:1854: error: invalid use of incomplete type ‘struct tm’ /usr/include/wchar.h:152: error: forward declaration of ‘struct tm’ /usr/include/c++/4.2.1/bits/locale_facets.tcc:1861: error: invalid use of incomplete type ‘struct tm’ /usr/include/wchar.h:152: error: forward declaration of ‘struct tm’ /usr/include/c++/4.2.1/bits/locale_facets.tcc:1873: error: invalid use of incomplete type ‘struct tm’ /usr/include/wchar.h:152: error: forward declaration of ‘struct tm’ /usr/include/c++/4.2.1/bits/locale_facets.tcc:1880: error: invalid use of incomplete type ‘struct tm’ /usr/include/wchar.h:152: error: forward declaration of ‘struct tm’ /usr/include/c++/4.2.1/bits/locale_facets.tcc:1883: error: invalid use of incomplete type ‘struct tm’ /usr/include/wchar.h:152: error: forward declaration of ‘struct tm’ /usr/include/c++/4.2.1/bits/locale_facets.tcc:1895: error: invalid use of incomplete type ‘struct tm’ /usr/include/wchar.h:152: error: forward declaration of ‘struct tm’ /usr/include/c++/4.2.1/bits/locale_facets.tcc:1900: error: invalid use of incomplete type ‘struct tm’ /usr/include/wchar.h:152: error: forward declaration of ‘struct tm’ /usr/include/c++/4.2.1/bits/locale_facets.tcc:1908: error: invalid use of incomplete type ‘struct tm’ /usr/include/wchar.h:152: error: forward declaration of ‘struct tm’ /usr/include/c++/4.2.1/bits/locale_facets.tcc:1912: error: invalid use of incomplete type ‘struct tm’ /usr/include/wchar.h:152: error: forward declaration of ‘struct tm’ /usr/include/c++/4.2.1/bits/locale_facets.tcc:1932: error: invalid use of incomplete type ‘struct tm’ /usr/include/wchar.h:152: error: forward declaration of ‘struct tm’ /usr/include/c++/4.2.1/bits/locale_facets.tcc:1968: error: invalid use of incomplete type ‘struct tm’ /usr/include/wchar.h:152: error: forward declaration of ‘struct tm’ /usr/include/c++/4.2.1/bits/locale_facets.tcc:1976: error: invalid use of incomplete type ‘struct tm’ /usr/include/wchar.h:152: error: forward declaration of ‘struct tm’ /usr/include/c++/4.2.1/bits/locale_facets.tcc: In member function ‘virtual _InIter std::time_get&lt;_CharT, _InIter&gt;::do_get_weekday(_InIter, _InIter, std::ios_base&amp;, std::_Ios_Iostate&amp;, tm*) const’: /usr/include/c++/4.2.1/bits/locale_facets.tcc:2210: error: invalid use of incomplete type ‘struct tm’ /usr/include/wchar.h:152: error: forward declaration of ‘struct tm’ /usr/include/c++/4.2.1/bits/locale_facets.tcc: In member function ‘virtual _InIter std::time_get&lt;_CharT, _InIter&gt;::do_get_monthname(_InIter, _InIter, std::ios_base&amp;, std::_Ios_Iostate&amp;, tm*) const’: /usr/include/c++/4.2.1/bits/locale_facets.tcc:2259: error: invalid use of incomplete type ‘struct tm’ /usr/include/wchar.h:152: error: forward declaration of ‘struct tm’ /usr/include/c++/4.2.1/bits/locale_facets.tcc: In member function ‘virtual _InIter std::time_get&lt;_CharT, _InIter&gt;::do_get_year(_InIter, _InIter, std::ios_base&amp;, std::_Ios_Iostate&amp;, tm*) const’: /usr/include/c++/4.2.1/bits/locale_facets.tcc:2288: error: invalid use of incomplete type ‘struct tm’ /usr/include/wchar.h:152: error: forward declaration of ‘struct tm’ </code></pre>
 

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