Borland C++ 4.5
unable to open include file winsock2.h
unable to open include file string

Borland C++ 5.02 с средой разработки
unable to open include file sstream.h

Borland C++ 5.5 без среды разработки
bcc32.exe pop3.cpp
unable to open include file winsock2.h
unable to open inclue file string
unable to open include file algorithm

unable to open include file sstream


C++BuilderX
Unable to open include file 'sstream.h'
и куча других ошибок
Выбираю Project Make pop3.cpp
и не понятно что выбирать, какой проджект делать, выбираю консольное приложение