ll and I64 work fine when __USE_MINGW_ANSI_STDIO is set. We still remove the setting of __USE_MINGW_ANSI_STDIO=0 on Makefile, since the rest our packages are built with __USE_MINGW_ANSI_STDIO=1. See https://core.tcl-lang.org/tcl/tktview/c9759399735f1979a2e7931fd9f00da20f2fbb7e