plugin derleme hatası

[ACYOLUBABACIM]

AMX Mod X Compiler 1.8.3-dev+5079
Copyright (c) 1997-2006 ITB CompuPhase
Copyright (c) 2004-2013 AMX Mod X Team

ANTİduck.sma(1) : error 010: invalid function or declaration
ANTİduck.sma(156) : error 017: undefined symbol "strlen"
ANTİduck.sma(175) : warning 233: symbol "client_disconnect" is marked as deprecated: Use client_disconnected() instead.
ANTİduck.sma(686) : error 017: undefined symbol "strlen"
ANTİduck.sma(711) : error 017: undefined symbol "strlen"

4 Errors.
Could not locate output file ANTİduck.amx (compile failed).

bu hatalari veriyor düzeltebilirmisiniz