`Missing = inserted for \ifnum` when using addplot

I'm trying to plot a normalized sinc function with PGFPlots/TikZ. As this is somewhat tricky because of the limiting value at 0, I used a suggestion provided by percusse.

Here's a minimal example (note that I've renamed the function to sincf due to conflicts with the rest of the document and inserted an approximation of Pi to normalize):

\documentclass{scrreprt}\usepackage{pgfplots}\pgfplotsset{compat=1.12}\begin{document}\begin{tikzpicture}% https://tex.stackexchange.com/a/235009\pgfmathdeclarefunction{sincf}{1}{%        \pgfmathparse{abs(#1)<0.01 ? int(1) : int(0)}%        \ifnum\pgfmathresult>0 %            \pgfmathparse{1}%        \else%            \pgfmathparse{sin(3.14159*#1 r)/(3.14159*#1)}%        \fi%}    \begin{axis}        \addplot {sincf(\x)};    \end{axis}\end{tikzpicture}\end{document}

However, I'm getting two errors which I can't figure out:

! Missing = inserted for \ifnum.<to be read again>Yl.23 \addplot plot (\x,{sincf(\x)});I was expecting to see `<', `=', or `>'. Didn't.! Missing number, treated as zero.<to be read again>Yl.23 \addplot plot (\x,{sincf(\x)});A number should have been here; I inserted `0'.(If you can't figure out why I needed to see a number,look up `weird error' in the index to The TeXbook.)

Using MikTeX 2.9