NOT recommended. Only if you ABSOLUTELY need it.
The SSE2/legacy build will be a separate download option, and
warn you if you try to run it on a CPU that supports SSE4.
Do **not** use this with /usr or /usr/local. It creates subdirectories
for resources/translations in the install prefix.
It's intended for creating a relocatable, self-contained bundle, which
can be packaged.
