[R-pkg-devel] C function dbinom_raw missing on r-oldrel-windows-ix86+x86_64

My recent revision of the package 'secr' has been accepted by CRAN, but I
see from the Check Results that installation fails (see link below) on
r-oldrel-windows-ix86+x86_64 (alone) because it cannot find dbinom_raw
(which I now call directly). Is there an easy fix, and should I bother?

https://www.r-project.org/nosvn/R.check/r-oldrel-windows-ix86+x86_64/secr-00install.html

Murray