I wanted to test the mail example, but that gave some errors. Can you please revice this
Undefined symbols for architecture x86_64:
 "_HB_FUN_MAILADDATTACH", referenced from:
   _symbols_table in libfive.a(mail.o)
 "_HB_FUN_MAILCREATE", referenced from:
   _symbols_table in libfive.a(mail.o)
 "_HB_FUN_MAILSEND", referenced from:
   _symbols_table in libfive.a(mail.o)
 "_HB_FUN_MAILSETFROM", referenced from:
   _symbols_table in libfive.a(mail.o)
 "_HB_FUN_MAILSETMSG", referenced from:
   _symbols_table in libfive.a(mail.o)
 "_HB_FUN_MAILSETSUBJECT", referenced from:
   _symbols_table in libfive.a(mail.o)
 "_HB_FUN_MAILSETTO", referenced from:
   _symbols_table in libfive.a(mail.o)René Koot