Hello Helmut I've looked at the cross-compile failure report and have already patched this upstream. I will soon release 0.3 with this and several other enhancements.
Thank you for the attached patch, it's quite interesting that there's a mechanism tailored for "plain" makefiles. I can apply it ASAP if you would like to see this improvement quickly. Otherwise libzt 0.3 will correctly handle --host and --build configuration options. I plan to do the release in the next few days, most likely next Friday / Saturday. Best regards ZK