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-rw-r--r--include/ruby/win32.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/ruby/win32.h b/include/ruby/win32.h
index d75c7ea9d3..47a85270a5 100644
--- a/include/ruby/win32.h
+++ b/include/ruby/win32.h
@@ -222,6 +222,7 @@ struct msghdr {
extern int rb_w32_cmdvector(const char *, char ***);
extern rb_pid_t rb_w32_pipe_exec(const char *, const char *, int, int *, int *);
extern int flock(int fd, int oper);
+extern int rb_w32_has_cancel_io(void);
extern int rb_w32_is_socket(int);
extern int WSAAPI rb_w32_accept(int, struct sockaddr *, int *);
extern int WSAAPI rb_w32_bind(int, const struct sockaddr *, int);