Only snag is the pre-built version didn’t support long sms’s, so I needed to patch and re-compile. That means needing an arm cross-compiler, the build environment etc. More here
Since it runs linux, the fact that the official software doesn’t support it isn’t the end of the world. Handily, someone’s written a small sms importer program that reads in the sms’s from the S60 pc-suite csv export, and loads them onto the phone.