Hello all, First, a small advert for this: https://hughjonesd.shinyapps.io/rcheology/ which lists functions in core R going back to 3.0.1. Second, I'm trying to extend this back to 2.0.0. That involves building many versions of R from source on a Docker image of Debian Sarge. (Shades of 2006, when the Linux desktop was around the corner, just as soon as I'd finished compiling this *^&%* software...) This is obviously quite slow. Do list members have any suggestions for how to maximize compilation speed of (old) R sources? Currently I'm doing: CFLAGS="-O0 -pipe" FFLAGS=-O0 ./configure --with-recommended-packages=no \ --with-libpng=no --with-libjpeg=no \ --with-tcl-config=/usr/lib/tcl8.4/tclConfig.sh \ --with-tk-config=/usr/lib/tk8.4/tkConfig.sh --with-tcl-tk=yes make -j4 Cheers, David [[alternative HTML version deleted]]