The win32 isc/time.h was missing <time.h> header leading to:
lib\isc\win32\include\isc\time.h(29): warning C4013: 'gmtime_s'
undefined; assuming extern returning int (compiling source file
..\app.c) [lib\isc\win32\libisc.vcxproj]
lib\isc\win32\include\isc\time.h(39): warning C4013: 'localtime_s'
undefined; assuming extern returning int (compiling source file
..\app.c) [lib\isc\win32\libisc.vcxproj]
#include <errno.h>
#include <inttypes.h>
#include <stdbool.h>
+#include <time.h>
#include <windows.h>
#include <isc/lang.h>