MartinW wrote:
I think it might be that I'm lacking the flags '-pthread -fsigned-char', but I'm currently using Flow Studio and no matter where I add these in the settings they don't seem to get added to the Makefile. Maybe I'll go with my own Makefile and see if that helps.

[EDIT] That works - thank you. Would be nice to work out how to get the same behaviour from Flow Studio but I can just use a custom Makefile for the moment.