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if tst -D_ISOC99_SOURCE -lm note{ _ISOC99_SOURCE plays nice }end link{
#include <sys/types.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <unistd.h>
#include <math.h>
int main() { return signbit(-0.0); }
}end {
#ifndef _ISOC99_SOURCE
#define _ISOC99_SOURCE 1
#endif
}
endif
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