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/* ISC license. */ #undef _POSIX_C_SOURCE #undef _XOPEN_SOURCE #ifndef _BSD_SOURCE #define _BSD_SOURCE #endif #ifndef _NETBSD_SOURCE #define _NETBSD_SOURCE #endif #ifndef __EXTENSIONS__ #define __EXTENSIONS__ #endif #include <unistd.h> #include <grp.h> int main (void) { gid_t g = 0 ; setgroups(1, &g) ; return 0 ; }