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missing math function

After nearbyint, I think a few more math functions need importing.

I just tried to compile pkgsrc/lang/R, and discovered

% cat foo.c
#include <math.h>

int main()
        long double ret, x, a;

        x = 3.1;
        a = 2.4;
        ret = powl(x, a);

        return 0;
% gcc -o foo foo.c -Wall -lm
/var/tmp//cceyW6q6.o: In function `main':
foo.c:(.text+0x54): undefined reference to `powl'



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