We are currently porting over RethinkDB to z Systems aka s390x.
Our team have been trying to get rethinkDB build with this instruction: https://github.com/linux-on-ibm-z/docs/wiki/Building-RethinkDB-DRAFT . They have been mostly working around the inline assemblies, as well as making things work with V8 3.28 instead of 3.30 (not available and hard to move to on z). We're working on context switching code to enable z at this time.

Could you please take a look at the link above to check, whether something obvious is missing?