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/* ISC license. */ #undef _POSIX_C_SOURCE #undef _XOPEN_SOURCE #ifndef _XPG4_2 # define _XPG4_2 #endif #ifndef _XPG_6 # define _XPG6 #endif #ifndef _GNU_SOURCE # define _GNU_SOURCE #endif #include <sys/types.h> #include <sys/socket.h> int main (void) { int flag = MSG_CMSG_CLOEXEC ; return 0 ; }