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#include <sys/types.h> #include <unistd.h> #include "dietwarning.h" #undef setegid int setegid(gid_t gid); int setegid(gid_t gid) { return setregid((gid_t)-1,gid); } link_warning("setegid","warning: you used setegid without including <unistd.h>")