Diff of the two buildlogs:

--
--- b1/build.log	2023-04-13 20:04:17.305511379 +0000
+++ b2/build.log	2023-04-13 20:05:54.325206361 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Thu Apr 13 08:02:09 -12 2023
-I: pbuilder-time-stamp: 1681416129
+I: Current time: Thu May 16 16:27:20 +14 2024
+I: pbuilder-time-stamp: 1715826440
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/bookworm-reproducible-base.tgz]
 I: copying local configuration
@@ -16,7 +16,7 @@
 I: copying [./qconf_2.5.orig.tar.gz]
 I: copying [./qconf_2.5-1.debian.tar.xz]
 I: Extracting source
-gpgv: Signature made Thu Jan  7 13:08:53 2021 -12
+gpgv: Signature made Fri Jan  8 15:08:53 2021 +14
 gpgv:                using RSA key EF8359781239A9194D2D7F59D0015BD128F39278
 gpgv:                issuer "tehnick@debian.org"
 gpgv: Can't check signature: No public key
@@ -26,11 +26,20 @@
 dpkg-source: info: unpacking qconf_2.5-1.debian.tar.xz
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/18568/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/25882/tmp/hooks/D01_modify_environment starting
+debug: Running on codethink9-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
+lrwxrwxrwx 1 root root 4 Jan  6  2023 /bin/sh -> dash
+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/25882/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/25882/tmp/hooks/D02_print_environment starting
 I: set
   BUILDDIR='/build'
-  BUILDUSERGECOS='first user,first room,first work-phone,first home-phone,first other'
-  BUILDUSERNAME='pbuilder1'
+  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=8'
@@ -40,38 +49,38 @@
   IFS=' 	
   '
   LANG='C'
-  LANGUAGE='en_US:en'
+  LANGUAGE='nl_BE:nl'
   LC_ALL='C'
   MAIL='/var/mail/root'
   OPTIND='1'
-  PATH='/usr/sbin:/usr/bin:/sbin:/bin:/usr/games'
+  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'
-  PPID='18568'
+  PPID='25882'
   PS1='# '
   PS2='> '
   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.dmLlNsyg/pbuilderrc_4Ylw --distribution bookworm --hookdir /etc/pbuilder/first-build-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/bookworm-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.dmLlNsyg/b1 --logfile b1/build.log qconf_2.5-1.dsc'
+  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.dmLlNsyg/pbuilderrc_u3mf --distribution bookworm --hookdir /etc/pbuilder/rebuild-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/bookworm-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.dmLlNsyg/b2 --logfile b2/build.log --extrapackages usrmerge qconf_2.5-1.dsc'
   SUDO_GID='117'
   SUDO_UID='110'
   SUDO_USER='jenkins'
   TERM='unknown'
-  TZ='/usr/share/zoneinfo/Etc/GMT+12'
+  TZ='/usr/share/zoneinfo/Etc/GMT-14'
   USER='root'
   USERNAME='root'
   _='/usr/bin/systemd-run'
   http_proxy='http://192.168.101.16:3128'
 I: uname -a
-  Linux codethink10-arm64 4.15.0-208-generic #220-Ubuntu SMP Mon Mar 20 14:28:12 UTC 2023 aarch64 GNU/Linux
+  Linux i-capture-the-hostname 4.15.0-208-generic #220-Ubuntu SMP Mon Mar 20 14:28:12 UTC 2023 aarch64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 Apr 10 22:26 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/18568/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 May 15 06:47 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/25882/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -267,7 +276,7 @@
 Get: 156 http://deb.debian.org/debian bookworm/main arm64 qt5-qmake arm64 5.15.8+dfsg-3 [221 kB]
 Get: 157 http://deb.debian.org/debian bookworm/main arm64 qtbase5-dev-tools arm64 5.15.8+dfsg-3 [706 kB]
 Get: 158 http://deb.debian.org/debian bookworm/main arm64 qtbase5-dev arm64 5.15.8+dfsg-3 [1116 kB]
-Fetched 85.8 MB in 2s (46.9 MB/s)
+Fetched 85.8 MB in 2s (42.7 MB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 Selecting previously unselected package libpython3.11-minimal:arm64.
 (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 ... 19616 files and directories currently installed.)
@@ -919,8 +928,17 @@
 Writing extended state information...
 Building tag database...
  -> Finished parsing the build-deps
+Reading package lists...
+Building dependency tree...
+Reading state information...
+usrmerge is already the newest version (35).
+0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
 I: Building the package
-I: Running cd /build/qconf-2.5/ && 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  > ../qconf_2.5-1_source.changes
+I: user script /srv/workspace/pbuilder/25882/tmp/hooks/A99_set_merged_usr starting
+Re-configuring usrmerge...
+I: user script /srv/workspace/pbuilder/25882/tmp/hooks/A99_set_merged_usr finished
+hostname: Temporary failure in name resolution
+I: Running cd /build/qconf-2.5/ && 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  > ../qconf_2.5-1_source.changes
 dpkg-buildpackage: info: source package qconf
 dpkg-buildpackage: info: source version 2.5-1
 dpkg-buildpackage: info: source distribution unstable
@@ -1015,8 +1033,8 @@
 dh_auto_install -- INSTALL_ROOT=/build/qconf-2.5/debian/qconf
 	make -j8 install DESTDIR=/build/qconf-2.5/debian/qconf AM_UPDATE_INFO_DIR=no INSTALL_ROOT=/build/qconf-2.5/debian/qconf
 make[2]: Entering directory '/build/qconf-2.5'
-/usr/lib/qt5/bin/qmake -install qinstall /build/qconf-2.5/conf /build/qconf-2.5/debian/qconf/usr/share/qconf/conf
 /usr/lib/qt5/bin/qmake -install qinstall -exe qconf /build/qconf-2.5/debian/qconf/usr/bin/qconf
+/usr/lib/qt5/bin/qmake -install qinstall /build/qconf-2.5/conf /build/qconf-2.5/debian/qconf/usr/share/qconf/conf
 /usr/lib/qt5/bin/qmake -install qinstall /build/qconf-2.5/modules /build/qconf-2.5/debian/qconf/usr/share/qconf/modules
 strip /build/qconf-2.5/debian/qconf/usr/bin/qconf
 make[2]: Leaving directory '/build/qconf-2.5'
@@ -1049,12 +1067,14 @@
 dpkg-buildpackage: info: binary-only upload (no source included)
 dpkg-genchanges: info: including full source code in upload
 I: copying local configuration
+I: user script /srv/workspace/pbuilder/25882/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/25882/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/18568 and its subdirectories
-I: Current time: Thu Apr 13 08:04:16 -12 2023
-I: pbuilder-time-stamp: 1681416256
+I: removing directory /srv/workspace/pbuilder/25882 and its subdirectories
+I: Current time: Thu May 16 16:28:53 +14 2024
+I: pbuilder-time-stamp: 1715826533