@evoskuil I don't know if it is appropriate for libbitcoin but I have found something: "...On both machines boost uses ICU. I added fold and normalize functions to the listing above - also here I get different output on Windows and Linux....", "I fixed it - for anyone, who might step into the same trouble here is the solution: Although I didn't get any error message while compiling nor when the application was executed it was not sufficient to just include icuucd.lib for linking you have to include icuind.lib as well. Then you get the same result on Windows and Linux." Rainer
https://stackoverflow.com/questions/22331487/string-conversion-with-boost-locale-different-behaviour-on-windows-and-linux#-windows-and-linux#