Diff of the two buildlogs:

--
--- b1/build.log	2024-10-31 04:53:48.118849170 +0000
+++ b2/build.log	2024-10-31 04:54:55.912432262 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Tue Dec  2 23:15:01 -12 2025
-I: pbuilder-time-stamp: 1764760501
+I: Current time: Thu Dec  4 01:16:51 +14 2025
+I: pbuilder-time-stamp: 1764760611
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/trixie-reproducible-base.tgz]
 I: copying local configuration
@@ -29,52 +29,84 @@
 dpkg-source: info: applying 01-patch-cmakelists.diff
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/1548536/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/1786233/tmp/hooks/D01_modify_environment starting
+debug: Running on codethink03-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 Dec  3 11:16 /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/1786233/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/1786233/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]="32" [3]="1" [4]="release" [5]="aarch64-unknown-linux-gnu")
+  BASH_VERSION='5.2.32(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='trixie'
-  HOME='/root'
-  HOST_ARCH='arm64'
+  DIRSTACK=()
+  DISTRIBUTION=trixie
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=aarch64
+  HOST_ARCH=arm64
   IFS=' 	
   '
-  INVOCATION_ID='91c9f4a829d3447fac91a9419f3de93b'
-  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='1548536'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=439e0ce20885404abda68dabbf58d169
+  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=1786233
   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.UKtwqwiR/pbuilderrc_KBfF --distribution trixie --hookdir /etc/pbuilder/first-build-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/trixie-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.UKtwqwiR/b1 --logfile b1/build.log units-cpp_2.3.3+ds-4.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.UKtwqwiR/pbuilderrc_KG9p --distribution trixie --hookdir /etc/pbuilder/rebuild-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/trixie-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.UKtwqwiR/b2 --logfile b2/build.log units-cpp_2.3.3+ds-4.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 6.1.0-26-cloud-arm64 #1 SMP Debian 6.1.112-1 (2024-09-30) aarch64 GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-26-cloud-arm64 #1 SMP Debian 6.1.112-1 (2024-09-30) aarch64 GNU/Linux
 I: ls -l /bin
   lrwxrwxrwx 1 root root 7 Aug  4  2024 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/1548536/tmp/hooks/D02_print_environment finished
+I: user script /srv/workspace/pbuilder/1786233/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -169,7 +201,7 @@
 Get: 53 http://deb.debian.org/debian trixie/main arm64 debhelper all 13.20 [915 kB]
 Get: 54 http://deb.debian.org/debian trixie/main arm64 googletest all 1.15.2-1 [514 kB]
 Get: 55 http://deb.debian.org/debian trixie/main arm64 libgtest-dev arm64 1.15.2-1 [245 kB]
-Fetched 35.4 MB in 0s (101 MB/s)
+Fetched 35.4 MB in 0s (170 MB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 Selecting previously unselected package libproc2-0:arm64.
 (Reading database ... 
(Reading database ... 5%
(Reading database ... 10%
(Reading database ... 15%
(Reading database ... 20%
(Reading database ... 25%
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(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 ... 20067 files and directories currently installed.)
@@ -404,7 +436,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/units-cpp-2.3.3+ds/ && 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  > ../units-cpp_2.3.3+ds-4_source.changes
+I: user script /srv/workspace/pbuilder/1786233/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for trixie
+I: user script /srv/workspace/pbuilder/1786233/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/units-cpp-2.3.3+ds/ && 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  > ../units-cpp_2.3.3+ds-4_source.changes
 dpkg-buildpackage: info: source package units-cpp
 dpkg-buildpackage: info: source version 2.3.3+ds-4
 dpkg-buildpackage: info: source distribution unstable
@@ -440,7 +476,7 @@
 -- Check for working C compiler: /usr/bin/cc - skipped
 -- Detecting C compile features
 -- Detecting C compile features - done
--- Configuring done (1.8s)
+-- Configuring done (1.0s)
 -- Generating done (0.0s)
 CMake Warning:
   Manually-specified variables were not used by the project:
@@ -471,7 +507,7 @@
 make[3]: Entering directory '/build/reproducible-path/units-cpp-2.3.3+ds/obj-aarch64-linux-gnu'
 [ 50%] Building CXX object unitTests/CMakeFiles/unitLibTest.dir/main.cpp.o
 cd /build/reproducible-path/units-cpp-2.3.3+ds/obj-aarch64-linux-gnu/unitTests && /usr/bin/cmake -E time /usr/bin/c++  -I/build/reproducible-path/units-cpp-2.3.3+ds/include -g -O2 -ffile-prefix-map=/build/reproducible-path/units-cpp-2.3.3+ds=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -mbranch-protection=standard -Wdate-time -D_FORTIFY_SOURCE=2 -std=gnu++14 -Wall -Wextra -pedantic -MD -MT unitTests/CMakeFiles/unitLibTest.dir/main.cpp.o -MF CMakeFiles/unitLibTest.dir/main.cpp.o.d -o CMakeFiles/unitLibTest.dir/main.cpp.o -c /build/reproducible-path/units-cpp-2.3.3+ds/unitTests/main.cpp
-Elapsed time (seconds): 54.8162
+Elapsed time (seconds): 31.8312
 [100%] Linking CXX executable unitLibTest
 cd /build/reproducible-path/units-cpp-2.3.3+ds/obj-aarch64-linux-gnu/unitTests && /usr/bin/cmake -E cmake_link_script CMakeFiles/unitLibTest.dir/link.txt --verbose=1
 /usr/bin/c++ -g -O2 -ffile-prefix-map=/build/reproducible-path/units-cpp-2.3.3+ds=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -mbranch-protection=standard -Wdate-time -D_FORTIFY_SOURCE=2 -Wl,-z,relro -Wl,-z,now -rdynamic CMakeFiles/unitLibTest.dir/main.cpp.o -o unitLibTest  -lgtest
@@ -871,7 +907,7 @@
 1: [----------] 2 tests from CaseStudies (0 ms total)
 1: 
 1: [----------] Global test environment tear-down
-1: [==========] 172 tests from 8 test suites ran. (2 ms total)
+1: [==========] 172 tests from 8 test suites ran. (3 ms total)
 1: [  PASSED  ] 172 tests.
 1/1 Test #1: unitLibTest ......................   Passed    0.01 sec
 
@@ -918,12 +954,14 @@
 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/1786233/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/1786233/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/1548536 and its subdirectories
-I: Current time: Tue Dec  2 23:16:46 -12 2025
-I: pbuilder-time-stamp: 1764760606
+I: removing directory /srv/workspace/pbuilder/1786233 and its subdirectories
+I: Current time: Thu Dec  4 01:17:54 +14 2025
+I: pbuilder-time-stamp: 1764760674