On 5/16/26 2:55 PM, Norbert Preining wrote:
I rebuilt the Debian libpng package with the patch in place and installed it into my test chroot, the pdftex binary is linked with the lib in that package. The consequential pdflatex runs still generate pdf files with different check sums.Hmm. Interesting. I just rebuild from the texlive sources which incorporate this change. After that, the test Akira gave showed no differences Test was: TeX file loading the valuators.png, run it at least 2 secs apart, make sure that the PDF ids are the same. After that, I get bit-identical PDFs (this is with pdftex binary against patched libpng in texlive sources): $ cat valuators.tex \documentclass{article} \usepackage{graphicx} \begin{document} Hello. \includegraphics[width=8cm]{valuators.png} \end{document} $ md5sum valuators.png bad89b034cc9466d65ee95451e81a58c valuators.png $ for i in 1 2; do pdflatex -interaction=batchmode "\pdfinfo{/CreationDate(D:20260429034606Z)/ModDate(D:20260429034606Z)}\input{valuators.tex}"; mv valuators.pdf valuators${i}.pdf; sleep 2; done ..... $ cmp valuators1.pdf valuators2.pdf $ echo $? 0
Did you also set SOURCE_DATE_EPOCH, e.g.,like Akira did: export SOURCE_DATE_EPOCH=`perl -e "print time();"` export FORCE_SOURCE_DATE=1 Best regards, John
