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Subject: how can i call fflush in embedded c code?
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source code:

test.stp
#!/usr/bin/stap

%{
#include <stdio.h>
%}

function a() %{
  _stp_printf("abcd");
  fflush(stdout);
%}


probe begin {
        a()
}

>> stap -p -gv  test.stp
/tmp/stapdVs7bQ/stap_d2c2c903ade736f3fa649c78b8ab19e9_973_src.c:33:19:
fatal error: stdio.h: No such file or directory
 #include <stdio.h>
                   ^
compilation terminated.


question: how can compile it?