Hello, I'm not sure about the reason of this behavior but if configure guix --with-store-dir=/var/tmp/test_guix/gnu/store for exemple, the tests for gettext failed with a permission denied for test-copy-file-1.sh. If i configure guix with a store to $HOME/.local, everything run smoothly. Please find attached : - my guix build script from git for this test - the test-suite.log The daemon was launched like this : ------ $ sudo ./pre-inst-env guix-daemon --build-users-group=guixbuild --no-substitutes -c 4 -M 4 --debug ------ The package installation command : ------ $ ./pre-inst-env guix package -i hello --no-grafts --fallback -K ------ The permissions on /var /var/tmp : ------ $ stat -c "%a %n" /var /var/tmp 755 /var 1777 /var/tmp ------ If I take a look at the test-copy-file-1.sh, it seems that the /var/tmp is present inside the build chroot cause TMPDIR is defined as /var/tmp instead of /tmp. ------ $ head -n10 /tmp/guix-build-gettext-minimal-0.19.8.1.drv-0/gettext-0.19.8.1/gettext-tools/gnulib-tests/test-copy-file-1.sh #!/var/tmp/test_guix/gnu/store/sqvi3glr2jzgrvfbj624k1sgs15a954c-bash-minimal-4.4.12/bin/sh # Test copy-file on the file system of /var/tmp, which usually is a local # file system. if test -d /var/tmp; then TMPDIR=/var/tmp else TMPDIR=/tmp fi ------ In the "Build Environment Setup" documentation section, there is a mention about /tmp to be writable inside the chroot but there is no mention about /var/tmp and haven't seen a section for /var/tmp chroot inside guix file "build.cc". Best regards, Yoann