Appendix G: Building NSIS
NSIS version 2.07 introduced a new build system, based on SCons. The build system can build the entire NSIS package so you no longer need to build it project by project. It allows building using several simultaneous jobs, installation without an installer on both Windows and POSIX and easy compilation with debugging symbols.
The official release is built with MSVC6 Service Pack 5 (Mirror) with the Processor Pack and the February 2003 Platform SDK (5.2.3790.0).