... and execute it, then run this from it: cd c:\harbour\contrib\hbtip\ c:\harbour\contrib\hbtip>c:\harbour\bin\win\msvc64\hbmk2 hbtipssl.hbp -comp=msvc64 finally rename the created hbtip.lib as hbtipssl.lib Here you have it already built: https://github.com/FiveTechSoft/Harbour_builder/tree/master/win64_hbtipssl