Note that the version test using \ifdim is unsafe because values are
rounded to a certain number of scaled points before being compared.
On 11/3/19 5:27 PM, Taylor, P wrote:
> *\ifdim \XeTeXrevision pt < 0.99999pt*
\ifdim 0.99998pt < 0.99999pt
% expected
\else
\UNEXPECTED
\fi
gives an "Undefined control sequence ... \UNEXPECTED". Unfortunately
one needs to parse a bit more carefully the XeTeX revision, or perhaps
simply move the decimal point a bit.
\def\@XeTeX@revision@aux .#1#2{#1#2.}
\ifnum\expandafter\@XeTeX@revision@aux\XeTeXrevision<99.999pt
Bruno
