So this issue doesn't seem to be recent. It has been reported multiple times over the years:
https://github.com/cpputest/cpputest/issues/1563 https://github.com/cpputest/cpputest/issues/1639 https://github.com/cpputest/cpputest/issues/1743 https://bugs.launchpad.net/ubuntu/+source/cpputest/+bug/1990274 I wonder whether it's a regression due to changed behaviour of cmake now complaining about a non-existing directory which wasn't an issue in the past... It's also likely related to the multi-arch path used by Debian which adds one layer of directory for the cmake files. It looks like something is badly computing the /usr/include as /usr/lib/include possibly because it starts from /usr/lib/x86_64-linux-gnu/CppUTest instead of /usr/lib/CppUTest. Cheers, -- ⢀⣴⠾⠻⢶⣦⠀ Raphaël Hertzog <hert...@debian.org> ⣾⠁⢠⠒⠀⣿⡁ ⢿⡄⠘⠷⠚⠋ The Debian Handbook: https://debian-handbook.info/get/ ⠈⠳⣄⠀⠀⠀⠀ Debian Long Term Support: https://deb.li/LTS