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I forgot that INT64_FORMAT can't be used with sscanf on Windows. Use the same trick of sscanf'ing into a temp variable as we do in some other places in zic.c. The upstream IANA code avoids the portability problem by relying on <inttypes.h>'s SCNdFAST64 macro. Once we're requiring C99 in all branches, we should do likewise and drop this set of diffs from upstream. For now, though, a hack seems fine, since we do not actually care about leapseconds anyway. Discussion: https://postgr.es/m/4e5d1a5b-143e-e70e-a99d-a3b01c1ae7c3@2ndquadrant.com