First patch is not needed since version 1.67.0 and https://github.com/boostorg/locale/commit/90dd8146fbb01fd0a1b0473ad5a5d28644b65e87 Indeed, since this bump, the patch is wrongly patching virtual string_type format(double value,size_t &code_points) const instead of: virtual string_type format(int64_t value,size_t &code_points) const Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com> Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>