This is a follow-up to this question.
When I issue the gem update
command on Windows, whenever it gets to a
gem whose latest version DO
Looking at the RubyForge file list for sqlite3-ruby reveals that version 1.2.3 has gems that were built using Visual Studio 6 and MinGW (sqlite3-ruby-1.2.3-mswin32.gem & sqlite3-ruby-1.2.3-x86-mingw32.gem). However, version 1.2.4 doesn't not have any such pre-built gems.
If you have Visual Studio 6 or MinGW installed and have the compiler environment variables set up (at least for Visual Studio 6 but not sure about MinGW), the gem should build during installation. I'm not sure if the gems will build under newer versions of Visual Studio.