The minimum set of Cygwin packages needed to build wc3270 are:
[optional] If you want SSL support, you will need to build a MinGW OpenSSL library. That requres the following packages:
cd /usr/src/openssl-* ./Configure --prefix=/usr/local/mingw-openssl mingw make make install
To build wc3270 (with or without SSL support), start a Cygwin shell, cd to the directory where the source code resides, and type:
makewc3270 was developed primarily on 32-bit Windows XP, but should be buildable on Windows Server 2003 or Windows 2000. It has not been built or tested on 64-bit Windows or on Windows Vista.
The source tarball also includes an .iss file for use with Inno Setup. This is used to construct the install executable. See the Inno Setup webpage for details.