bug#56399: Problem building in windows; base, out_waiting

[Bloom-Scheff, James L. [US-US] [NON-EMP]]

I am trying to use zlib in windows with visual studio 2019 and 32 bits. I am 
getting compile errors. Zlib appears to be using methods which are not defined 
anywhere. I can't find any documentation or information about them.

Any suggestions?

1>C:\OptinetSDK5.0\OptiNetBase\windows\compat_linux\zlib\contrib\iostream\zfstream.cpp(142,9):
 error C3861: 'base': identifier not found
1>C:\OptinetSDK5.0\OptiNetBase\windows\compat_linux\zlib\contrib\iostream\zfstream.cpp(144,11):
 error C3861: 'allocate': identifier not found
1>C:\OptinetSDK5.0\OptiNetBase\windows\compat_linux\zlib\contrib\iostream\zfstream.cpp(153,10):
 error C3861: 'out_waiting': identifier not found
1>C:\OptinetSDK5.0\OptiNetBase\windows\compat_linux\zlib\contrib\iostream\zfstream.cpp(178,9):
 error C3861: 'base': identifier not found
1>C:\OptinetSDK5.0\OptiNetBase\windows\compat_linux\zlib\contrib\iostream\zfstream.cpp(179,10):
 error C3861: 'allocate': identifier not found
1>C:\OptinetSDK5.0\OptiNetBase\windows\compat_linux\zlib\contrib\iostream\zfstream.cpp(186,9):
 error C3861: 'out_waiting': identifier not found
1>C:\OptinetSDK5.0\OptiNetBase\windows\compat_linux\zlib\contrib\iostream\zfstream.cpp(192,12):
 error C3861: 'blen': identifier not found
1>C:\OptinetSDK5.0\OptiNetBase\windows\compat_linux\zlib\contrib\iostream\zfstream.cpp(193,9):
 error C3861: 'base': identifier not found
1>C:\OptinetSDK5.0\OptiNetBase\windows\compat_linux\zlib\contrib\iostream\zfstream.cpp(193,17):
 error C3861: 'base': identifier not found
1>C:\OptinetSDK5.0\OptiNetBase\windows\compat_linux\zlib\contrib\iostream\zfstream.cpp(211,8):
 error C3861: 'out_waiting': identifier not found
1>C:\OptinetSDK5.0\OptiNetBase\windows\compat_linux\zlib\contrib\iostream\zfstream.cpp(240,7):
 error C3861: 'base': identifier not found