x86_64 is used as a baseline: the "x86_64" entry, whatever status it has,
is transformed into "all", and then the other entries in ARCHITECTURES
either dropped or rearranged appropriately.
stays disabled:
* the package is definitely too large (500MB).
* this doesn't use cmake for the installation, so binaries have
a RPATH hardcoded, this is bad.
waddlesplash