title: TDateTime LinkError
body: <p>I am using C++ Builder and am getting the following errors:</p>
  
  <pre><code>[ILINK32 Error] Error: Unresolved external '__fastcall System::Internal::Strhlpr::UnicodeFree(System::UnicodeString&amp;)' referenced from C:\PROGRAM FILES (X86)\EMBARCADERO\RAD STUDIO\9.0\LIB\WIN32\DEBUG\VCLE.LIB|ustring
  [ILINK32 Error] Error: Unresolved external '__fastcall System::Internal::Strhlpr::UnicodeFromPChar(System::UnicodeString&amp;, char *, bool)' referenced from C:\PROGRAM FILES (X86)\EMBARCADERO\RAD STUDIO\9.0\LIB\WIN32\DEBUG\VCLE.LIB|ustring
  [ILINK32 Error] Error: Unresolved external '__fastcall System::Sysutils::StrToDateTime(const System::UnicodeString)' referenced from C:\PROGRAM FILES (X86)\EMBARCADERO\RAD STUDIO\9.0\LIB\WIN32\DEBUG\VCLE.LIB|datetime
  [ILINK32 Error] Error: Unresolved external '__fastcall System::Sysutils::StrToDate(const System::UnicodeString)' referenced from C:\PROGRAM FILES (X86)\EMBARCADERO\RAD STUDIO\9.0\LIB\WIN32\DEBUG\VCLE.LIB|datetime
  [ILINK32 Error] Error: Unresolved external '__fastcall System::Syncobjs::TInterlocked::Increment(int&amp;)' referenced from C:\PROGRAM FILES (X86)\EMBARCADERO\RAD STUDIO\9.0\LIB\WIN32\DEBUG\VCLE.LIB|ustring
  [ILINK32 Error] Error: Unresolved external '__fastcall System::Sysutils::StrToTime(const System::UnicodeString)' referenced from C:\PROGRAM FILES (X86)\EMBARCADERO\RAD STUDIO\9.0\LIB\WIN32\DEBUG\VCLE.LIB|datetime
  [ILINK32 Error] Error: Unable to perform link
  </code></pre>
  
  <p>This is my code in main:</p>
  
  <pre><code>int _tmain(int argc, _TCHAR* argv[])
  {
  
  //TDateTime Mine("12/05/1990",TDateTime::TDateTimeFlag::Date);
  
  TDateTime Mine("12/05/1990");
  
  getch();
  return 0;
  }
  </code></pre>
  
  <p>And I have included 'vcl.h'</p>
  
  <p>What can I do to get this working?</p>