Following up on this, I noticed an earlier post of mine on the same topic in which I speculated that the C99 macro replacement might be an issue - I think it might well be. Upon close inspection, elsewhere in the code the PRI64u macro for nEffectiveBurnCoins is replaced by llu, rather than just the u in the print statement (that's 'cos it's a long long unsigned int, I kid you not) which is, suspiciously, exactly where things grind to a halt. So, even moar ells are required by the looks of it. I can't get the cross-compiler to work on this new Mint system, so I need to switch back to the old laptop, make the change, cross-compile a Windows binary, switch back to the new laptop, fire up the Windows VM, grab the binary and start it up, import a privkey with a burn tx recorded and see if it falls over. Here's hoping.

Cheers

Graham