Thank you for writing this package, it is badly needed!
I had to change time64.c lines 157 and 161 from array size  to  in order to make room for the implicit NULL character C places at the end of statically initialized strings.
After that, it compiled and ran in my test program without issue on RH4 (kernel 2.6.18+years of red hat patching).
Keep up the good work!
Good catch, thanks! And glad to hear you're making use of it.