Diff of the two buildlogs:

--
--- b1/build.log	2025-01-19 07:17:22.100740838 +0000
+++ b2/build.log	2025-01-19 07:22:23.931102845 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Sat Feb 21 01:32:16 -12 2026
-I: pbuilder-time-stamp: 1771680736
+I: Current time: Sun Jan 19 21:17:25 +14 2025
+I: pbuilder-time-stamp: 1737271045
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/unstable-reproducible-base.tgz]
 I: copying local configuration
@@ -27,52 +27,84 @@
 dpkg-source: info: applying do-not-generate-a-dep-on-python3-pkg-resources.patch
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/4068651/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/2189383/tmp/hooks/D01_modify_environment starting
+debug: Running on codethink02-arm64.
+I: Changing host+domainname to test build reproducibility
+I: Adding a custom variable just for the fun of it...
+I: Changing /bin/sh to bash
+'/bin/sh' -> '/bin/bash'
+lrwxrwxrwx 1 root root 9 Jan 19 07:17 /bin/sh -> /bin/bash
+I: Setting pbuilder2's login shell to /bin/bash
+I: Setting pbuilder2's GECOS to second user,second room,second work-phone,second home-phone,second other
+I: user script /srv/workspace/pbuilder/2189383/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/2189383/tmp/hooks/D02_print_environment starting
 I: set
-  BUILDDIR='/build/reproducible-path'
-  BUILDUSERGECOS='first user,first room,first work-phone,first home-phone,first other'
-  BUILDUSERNAME='pbuilder1'
-  BUILD_ARCH='arm64'
-  DEBIAN_FRONTEND='noninteractive'
+  BASH=/bin/sh
+  BASHOPTS=checkwinsize:cmdhist:complete_fullquote:extquote:force_fignore:globasciiranges:globskipdots:hostcomplete:interactive_comments:patsub_replacement:progcomp:promptvars:sourcepath
+  BASH_ALIASES=()
+  BASH_ARGC=()
+  BASH_ARGV=()
+  BASH_CMDS=()
+  BASH_LINENO=([0]="12" [1]="0")
+  BASH_LOADABLES_PATH=/usr/local/lib/bash:/usr/lib/bash:/opt/local/lib/bash:/usr/pkg/lib/bash:/opt/pkg/lib/bash:.
+  BASH_SOURCE=([0]="/tmp/hooks/D02_print_environment" [1]="/tmp/hooks/D02_print_environment")
+  BASH_VERSINFO=([0]="5" [1]="2" [2]="37" [3]="1" [4]="release" [5]="aarch64-unknown-linux-gnu")
+  BASH_VERSION='5.2.37(1)-release'
+  BUILDDIR=/build/reproducible-path
+  BUILDUSERGECOS='second user,second room,second work-phone,second home-phone,second other'
+  BUILDUSERNAME=pbuilder2
+  BUILD_ARCH=arm64
+  DEBIAN_FRONTEND=noninteractive
   DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=12 '
-  DISTRIBUTION='unstable'
-  HOME='/root'
-  HOST_ARCH='arm64'
+  DIRSTACK=()
+  DISTRIBUTION=unstable
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=aarch64
+  HOST_ARCH=arm64
   IFS=' 	
   '
-  INVOCATION_ID='74681fed25ed4457bb2376622129b8e7'
-  LANG='C'
-  LANGUAGE='en_US:en'
-  LC_ALL='C'
-  MAIL='/var/mail/root'
-  OPTIND='1'
-  PATH='/usr/sbin:/usr/bin:/sbin:/bin:/usr/games'
-  PBCURRENTCOMMANDLINEOPERATION='build'
-  PBUILDER_OPERATION='build'
-  PBUILDER_PKGDATADIR='/usr/share/pbuilder'
-  PBUILDER_PKGLIBDIR='/usr/lib/pbuilder'
-  PBUILDER_SYSCONFDIR='/etc'
-  PPID='4068651'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=85ad19e5c2314a36a0d5603bee39bfa2
+  LANG=C
+  LANGUAGE=nl_BE:nl
+  LC_ALL=C
+  MACHTYPE=aarch64-unknown-linux-gnu
+  MAIL=/var/mail/root
+  OPTERR=1
+  OPTIND=1
+  OSTYPE=linux-gnu
+  PATH=/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/i/capture/the/path
+  PBCURRENTCOMMANDLINEOPERATION=build
+  PBUILDER_OPERATION=build
+  PBUILDER_PKGDATADIR=/usr/share/pbuilder
+  PBUILDER_PKGLIBDIR=/usr/lib/pbuilder
+  PBUILDER_SYSCONFDIR=/etc
+  PIPESTATUS=([0]="0")
+  POSIXLY_CORRECT=y
+  PPID=2189383
   PS4='+ '
-  PWD='/'
-  SHELL='/bin/bash'
-  SHLVL='2'
-  SUDO_COMMAND='/usr/bin/timeout -k 18.1h 18h /usr/bin/ionice -c 3 /usr/bin/nice /usr/sbin/pbuilder --build --configfile /srv/reproducible-results/rbuild-debian/r-b-build.s1bzGojG/pbuilderrc_UHNX --distribution unstable --hookdir /etc/pbuilder/first-build-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/unstable-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.s1bzGojG/b1 --logfile b1/build.log scikit-build_0.18.1-2.dsc'
-  SUDO_GID='109'
-  SUDO_UID='104'
-  SUDO_USER='jenkins'
-  TERM='unknown'
-  TZ='/usr/share/zoneinfo/Etc/GMT+12'
-  USER='root'
-  _='/usr/bin/systemd-run'
-  http_proxy='http://192.168.101.4:3128'
+  PWD=/
+  SHELL=/bin/bash
+  SHELLOPTS=braceexpand:errexit:hashall:interactive-comments:posix
+  SHLVL=3
+  SUDO_COMMAND='/usr/bin/timeout -k 24.1h 24h /usr/bin/ionice -c 3 /usr/bin/nice -n 11 /usr/bin/unshare --uts -- /usr/sbin/pbuilder --build --configfile /srv/reproducible-results/rbuild-debian/r-b-build.s1bzGojG/pbuilderrc_rgwA --distribution unstable --hookdir /etc/pbuilder/rebuild-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/unstable-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.s1bzGojG/b2 --logfile b2/build.log scikit-build_0.18.1-2.dsc'
+  SUDO_GID=109
+  SUDO_UID=104
+  SUDO_USER=jenkins
+  TERM=unknown
+  TZ=/usr/share/zoneinfo/Etc/GMT-14
+  UID=0
+  USER=root
+  _='I: set'
+  http_proxy=http://192.168.101.4:3128
 I: uname -a
-  Linux codethink01-arm64 6.1.0-30-cloud-arm64 #1 SMP Debian 6.1.124-1 (2025-01-12) aarch64 GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-30-cloud-arm64 #1 SMP Debian 6.1.124-1 (2025-01-12) aarch64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 Nov 22  2024 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/4068651/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Nov 22 14:40 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/2189383/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -322,7 +354,7 @@
 Get: 170 http://deb.debian.org/debian unstable/main arm64 python3-sphinx-rtd-theme all 3.0.2+dfsg-2 [29.7 kB]
 Get: 171 http://deb.debian.org/debian unstable/main arm64 python3-wheel-whl all 0.45.1-1 [75.3 kB]
 Get: 172 http://deb.debian.org/debian unstable/main arm64 python3-virtualenv all 20.28.0+ds-1 [71.3 kB]
-Fetched 101 MB in 1s (119 MB/s)
+Fetched 101 MB in 0s (242 MB/s)
 Preconfiguring packages ...
 Selecting previously unselected package fonts-lato.
 (Reading database ... 
(Reading database ... 5%
(Reading database ... 10%
(Reading database ... 15%
(Reading database ... 20%
(Reading database ... 25%
(Reading database ... 30%
(Reading database ... 35%
(Reading database ... 40%
(Reading database ... 45%
(Reading database ... 50%
(Reading database ... 55%
(Reading database ... 60%
(Reading database ... 65%
(Reading database ... 70%
(Reading database ... 75%
(Reading database ... 80%
(Reading database ... 85%
(Reading database ... 90%
(Reading database ... 95%
(Reading database ... 100%
(Reading database ... 19965 files and directories currently installed.)
@@ -880,8 +912,8 @@
 Setting up tzdata (2025a-1) ...
 
 Current default time zone: 'Etc/UTC'
-Local time is now:      Sat Feb 21 13:33:08 UTC 2026.
-Universal Time is now:  Sat Feb 21 13:33:08 UTC 2026.
+Local time is now:      Sun Jan 19 07:17:52 UTC 2025.
+Universal Time is now:  Sun Jan 19 07:17:52 UTC 2025.
 Run 'dpkg-reconfigure tzdata' if you wish to change it.
 
 Setting up liberror-perl (0.17029-2) ...
@@ -1049,7 +1081,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/scikit-build-0.18.1/ && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games" HOME="/nonexistent/first-build" dpkg-buildpackage -us -uc -b && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games" HOME="/nonexistent/first-build" dpkg-genchanges -S  > ../scikit-build_0.18.1-2_source.changes
+I: user script /srv/workspace/pbuilder/2189383/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for unstable
+I: user script /srv/workspace/pbuilder/2189383/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/scikit-build-0.18.1/ && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/i/capture/the/path" HOME="/nonexistent/second-build" dpkg-buildpackage -us -uc -b && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/i/capture/the/path" HOME="/nonexistent/second-build" dpkg-genchanges -S  > ../scikit-build_0.18.1-2_source.changes
 dpkg-buildpackage: info: source package scikit-build
 dpkg-buildpackage: info: source version 0.18.1-2
 dpkg-buildpackage: info: source distribution unstable
@@ -1088,7 +1124,8 @@
 set -e ; set -x ; for i in 3.12 3.13 ; do \
 	python$i -m pytest -k 'not test_hello_sdist and not test_hello_sdist_with_base and not test_sdist_with_symlinks and not test_manifest_in_sdist and not test_generator_cleanup and not test_fortran and not test_pep518_findpython and not test_pep518 and not test_dual_pep518 and not test_hello_develop and not test_install_command and not test_help_commands and not test_test_command' --ignore=tests/test_distribution.py; \
 done
-+ python3.12 -m pytest -k not test_hello_sdist and not test_hello_sdist_with_base and not test_sdist_with_symlinks and not test_manifest_in_sdist and not test_generator_cleanup and not test_fortran and not test_pep518_findpython and not test_pep518 and not test_dual_pep518 and not test_hello_develop and not test_install_command and not test_help_commands and not test_test_command --ignore=tests/test_distribution.py
++ for i in 3.12 3.13
++ python3.12 -m pytest -k 'not test_hello_sdist and not test_hello_sdist_with_base and not test_sdist_with_symlinks and not test_manifest_in_sdist and not test_generator_cleanup and not test_fortran and not test_pep518_findpython and not test_pep518 and not test_dual_pep518 and not test_hello_develop and not test_install_command and not test_help_commands and not test_test_command' --ignore=tests/test_distribution.py
 ============================= test session starts ==============================
 platform linux -- Python 3.12.8, pytest-8.3.4, pluggy-1.5.0
 installed packages of interest: build==1.2.2 distro==1.9.0 packaging==24.2 pip==24.3.1 setuptools==75.6.0 setuptools_scm==8.1.0 virtualenv==20.28.0 wheel==0.45.1
@@ -1137,8 +1174,9 @@
 SKIPPED [1] tests/test_skbuild.py:84: NMake Makefiles generator is not available on Linux
 SKIPPED [3] tests/test_skbuild.py:130: Requires Windows
 SKIPPED [1] tests/test_skbuild.py:154: Requires Windows
-========== 187 passed, 35 skipped, 17 deselected in 168.63s (0:02:48) ==========
-+ python3.13 -m pytest -k not test_hello_sdist and not test_hello_sdist_with_base and not test_sdist_with_symlinks and not test_manifest_in_sdist and not test_generator_cleanup and not test_fortran and not test_pep518_findpython and not test_pep518 and not test_dual_pep518 and not test_hello_develop and not test_install_command and not test_help_commands and not test_test_command --ignore=tests/test_distribution.py
+========== 187 passed, 35 skipped, 17 deselected in 102.59s (0:01:42) ==========
++ for i in 3.12 3.13
++ python3.13 -m pytest -k 'not test_hello_sdist and not test_hello_sdist_with_base and not test_sdist_with_symlinks and not test_manifest_in_sdist and not test_generator_cleanup and not test_fortran and not test_pep518_findpython and not test_pep518 and not test_dual_pep518 and not test_hello_develop and not test_install_command and not test_help_commands and not test_test_command' --ignore=tests/test_distribution.py
 ============================= test session starts ==============================
 platform linux -- Python 3.13.1, pytest-8.3.4, pluggy-1.5.0
 installed packages of interest: build==1.2.2 distro==1.9.0 packaging==24.2 pip==24.3.1 setuptools==75.6.0 setuptools_scm==8.1.0 virtualenv==20.28.0 wheel==0.45.1
@@ -1187,7 +1225,7 @@
 SKIPPED [1] tests/test_skbuild.py:84: NMake Makefiles generator is not available on Linux
 SKIPPED [3] tests/test_skbuild.py:130: Requires Windows
 SKIPPED [1] tests/test_skbuild.py:154: Requires Windows
-========== 187 passed, 35 skipped, 17 deselected in 150.60s (0:02:30) ==========
+========== 187 passed, 35 skipped, 17 deselected in 106.57s (0:01:46) ==========
 make[1]: Leaving directory '/build/reproducible-path/scikit-build-0.18.1'
    create-stamp debian/debhelper-build-stamp
    dh_testroot -O--buildsystem=pybuild
@@ -1358,12 +1396,14 @@
 dpkg-buildpackage: info: binary-only upload (no source included)
 dpkg-genchanges: info: not including original source code in upload
 I: copying local configuration
+I: user script /srv/workspace/pbuilder/2189383/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/2189383/tmp/hooks/B01_cleanup finished
 I: unmounting dev/ptmx filesystem
 I: unmounting dev/pts filesystem
 I: unmounting dev/shm filesystem
 I: unmounting proc filesystem
 I: unmounting sys filesystem
 I: cleaning the build env 
-I: removing directory /srv/workspace/pbuilder/4068651 and its subdirectories
-I: Current time: Sat Feb 21 01:40:20 -12 2026
-I: pbuilder-time-stamp: 1771681220
+I: removing directory /srv/workspace/pbuilder/2189383 and its subdirectories
+I: Current time: Sun Jan 19 21:22:22 +14 2025
+I: pbuilder-time-stamp: 1737271342