I am not sure whether this topic should be in bug reports, but these days, simutrans nightly builds are not available at https://nightly.simutrans.com/en/ . What happened for the automatic nightly build system?
Because the compiler says it can do C11++ but it can't. Investigating.
EDIT: it seems i686 and x86_64 have different versions of runtime library versions. Well I changed to github nightly builds for now.