Hi, I think the https://gcc.gnu.org/wiki/Visibility could be updated a little. Right now it shows #if defined _WIN32 || defined __CYGWIN__ but I think it could be upgraded further with #if defined (_WIN32) || defined (__CYGWIN__) || (_WIN64) || defined (__CYGWIN64__) I have more information here if you want to look through it which was used to get libuninameslist library working: https://github.com/fontforge/libuninameslist/issues/25 and patch applied if it helps: https://github.com/fontforge/libuninameslist/commit/3d042076034801caaffc138ef13ce0af9bac61d5 Thanks, Hope everyone has a Happy New Year! Joe Da Silva
