Hi John,
I've already started work on the 64 bit compiling option. Nearly all the infrastructure is in place and most of the remaining work will be in translating RTL32.inc to RTL64.inc. But before doing this, it is better to get the wide string facilities bedded into RTL32 first. RTL32 and RTL64 have to be kept in sync thereafter.
Since we now have trouble-free compiling with FreeBasic 0.21 my first Linux port will be to get memory based (direct from script) Oxygen working. ELF executables can come later.
Charles