For building texi2latex, a C++ compiler is necessary. Well, actually you only use it for building a supporting program called tbrplent.
In order to use texi2latex, you need makeinfo from the standard Texinfo distribution, a modern and complete LaTeX, and an XSLT processor.
makeinfo should be clear.
As far as LaTeX is concerned, it's important to have all packages
that your document includes. This is
fancybox. Most of them should have been
shipped with your LaTeX distribution. If not, you get them at
It is highly probable though that you must install an XSLT 1.0 processor. The best one in my opinion is Saxon. Attention: Don't download and install version 8.x but version 6.5.3.