関連ワード:  error implicit declaration of function    error implicit declaration of function in c    error implicit declaration of function ‘system’    error implicit declaration of function ‘chmod’ -wimplicit-function-declaration    error implicit declaration of function ‘system’ -wimplicit-function-declaration    error implicit declaration of function ‘printf’ -wimplicit-function-declaration    error implicit declaration of function ‘strdup’    error implicit declaration of function ‘strlen’    error implicit declaration of function ‘wait’ -wimplicit-function-declaration    error implicit declaration of function ‘setuid’  
結果 : error implicit declaration of function