Where is _G_config.h?

[Jeffrey A Law]

  In message < 37CD9D83.EE970FDC@sergievsky.cpmc.columbia.edu >you write:
  > Hi,
  > 
  > I worte an earlier email about "_G_config.h "  iostream.h includes
  > streambuf.h  which includes libio.h which includes _G_config.h.  Does
  > anyone know where it is suppossed to be?  Thanks
It's built as part of the normal build procedure.  It is not a source file.

jeff