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Very wired that, the two functions are both used in the same kext of mine, but strncasecmp() is OK, while strnstr() will trigger below error when loading the kext:(kernel) kxld[com.dolphin.kext.aliedr]: The following symbols are unresolved for this kext:(kernel) kxld[com.dolphin.kext.aliedr]: _strnstr(kernel) Can't load kext com.dolphin.kext.aliedr - link failed.After checked, they are both declared in the same header file -- macOS 10.15 > Frameworks > Kernel > string.hAny comments?