MSVC does not have fseeko/ftello, causing compilation of the unmodified fuzzy.c file to fail on VS2022 (17.9.34728.123).
Relevant log entries (irrelevant paths stripped):
.\ssdeep\fuzzy.c(572,10): warning C4013: 'ftello' undefined; assuming extern returning int
.\ssdeep\fuzzy.c(575,7): warning C4013: 'fseeko' undefined; assuming extern returning int
fuzzy.obj : error LNK2001: unresolved external symbol fseeko
fuzzy.obj : error LNK2001: unresolved external symbol ftello
fatal error LNK1120: 2 unresolved externals