USE_IOSTREAM
The USE_IOSTREAM macro is only needed if you are using the IOSTREAMS package.
If you are using this package, you should add the following line to your Sources file:
USE_IOSTREAM=1
Otherwise, you may encounter build errors that indicate that some file of the form *stream.h cannot be found.
Note It is recommended that you use the STL package instead of the IOSTREAMS package. See USE_STL.
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Build date: 5/3/2011