Diff of the two buildlogs:

--
--- b1/build.log	2025-02-18 01:53:30.866260678 +0000
+++ b2/build.log	2025-02-18 02:01:20.781096560 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Mon Feb 17 13:33:50 -12 2025
-I: pbuilder-time-stamp: 1739842430
+I: Current time: Mon Mar 23 22:16:33 +14 2026
+I: pbuilder-time-stamp: 1774253793
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/unstable-reproducible-base.tgz]
 I: copying local configuration
@@ -24,52 +24,84 @@
 dpkg-source: info: applying hardening-rules.patch
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/1554138/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/4134898/tmp/hooks/D01_modify_environment starting
+debug: Running on ionos15-amd64.
+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 Mar 23 08:16 /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/4134898/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/4134898/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='amd64'
-  DEBIAN_FRONTEND='noninteractive'
-  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=20 '
-  DISTRIBUTION='unstable'
-  HOME='/root'
-  HOST_ARCH='amd64'
+  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]="x86_64-pc-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=amd64
+  DEBIAN_FRONTEND=noninteractive
+  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=42 '
+  DIRSTACK=()
+  DISTRIBUTION=unstable
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=x86_64
+  HOST_ARCH=amd64
   IFS=' 	
   '
-  INVOCATION_ID='37d4c77a58174c44b1c1cb50ce8014b9'
-  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='1554138'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=4f18ae5ceda34a25a298fd084c98b8b9
+  LANG=C
+  LANGUAGE=et_EE:et
+  LC_ALL=C
+  MACHTYPE=x86_64-pc-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=4134898
   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.zxgcMUEU/pbuilderrc_s1I7 --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.zxgcMUEU/b1 --logfile b1/build.log cb2bib_2.0.1-3.dsc'
-  SUDO_GID='110'
-  SUDO_UID='105'
-  SUDO_USER='jenkins'
-  TERM='unknown'
-  TZ='/usr/share/zoneinfo/Etc/GMT+12'
-  USER='root'
-  _='/usr/bin/systemd-run'
-  http_proxy='http://46.16.76.132:3128'
+  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.zxgcMUEU/pbuilderrc_at6j --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.zxgcMUEU/b2 --logfile b2/build.log cb2bib_2.0.1-3.dsc'
+  SUDO_GID=111
+  SUDO_UID=106
+  SUDO_USER=jenkins
+  TERM=unknown
+  TZ=/usr/share/zoneinfo/Etc/GMT-14
+  UID=0
+  USER=root
+  _='I: set'
+  http_proxy=http://213.165.73.152:3128
 I: uname -a
-  Linux ionos1-amd64 6.1.0-31-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.128-1 (2025-02-07) x86_64 GNU/Linux
+  Linux i-capture-the-hostname 6.12.9+bpo-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.12.9-1~bpo12+1 (2025-01-19) x86_64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 Nov 22 14:40 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/1554138/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Nov 22  2024 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/4134898/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -82,7 +114,7 @@
 Depends: debhelper-compat (= 13), libx11-dev, bibutils, x11proto-core-dev, qtchooser, qtbase5-dev, qtwebengine5-dev, libqt5x11extras5-dev, qt5-qmake, imagemagick, liblz4-dev, libjs-mathjax
 dpkg-deb: building package 'pbuilder-satisfydepends-dummy' in '/tmp/satisfydepends-aptitude/pbuilder-satisfydepends-dummy.deb'.
 Selecting previously unselected package pbuilder-satisfydepends-dummy.
-(Reading database ... 19798 files and directories currently installed.)
+(Reading database ... 19848 files and directories currently installed.)
 Preparing to unpack .../pbuilder-satisfydepends-dummy.deb ...
 Unpacking pbuilder-satisfydepends-dummy (0.invalid.0) ...
 dpkg: pbuilder-satisfydepends-dummy: dependency problems, but configuring anyway as you requested:
@@ -371,10 +403,10 @@
 Get: 242 http://deb.debian.org/debian unstable/main amd64 libqt5x11extras5-dev amd64 5.15.15-2 [9952 B]
 Get: 243 http://deb.debian.org/debian unstable/main amd64 qtpositioning5-dev amd64 5.15.15+dfsg-3 [21.5 kB]
 Get: 244 http://deb.debian.org/debian unstable/main amd64 qtwebengine5-dev amd64 5.15.18+dfsg-2 [71.6 kB]
-Fetched 182 MB in 4s (41.1 MB/s)
+Fetched 182 MB in 2s (103 MB/s)
 Preconfiguring packages ...
 Selecting previously unselected package libfftw3-double3:amd64.
-(Reading database ... 
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+(Reading database ... 
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(Reading database ... 100%
(Reading database ... 19848 files and directories currently installed.)
 Preparing to unpack .../00-libfftw3-double3_3.3.10-2+b1_amd64.deb ...
 Unpacking libfftw3-double3:amd64 (3.3.10-2+b1) ...
 Selecting previously unselected package libexpat1:amd64.
@@ -507,7 +539,7 @@
 Setting up libexpat1:amd64 (2.6.4-1) ...
 Setting up python3.13-minimal (3.13.2-1) ...
 Selecting previously unselected package python3-minimal.
-(Reading database ... 
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(Reading database ... 21093 files and directories currently installed.)
+(Reading database ... 
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(Reading database ... 21143 files and directories currently installed.)
 Preparing to unpack .../0-python3-minimal_3.13.1-2_amd64.deb ...
 Unpacking python3-minimal (3.13.1-2) ...
 Selecting previously unselected package media-types.
@@ -540,7 +572,7 @@
 Unpacking libpython3-stdlib:amd64 (3.13.1-2) ...
 Setting up python3-minimal (3.13.1-2) ...
 Selecting previously unselected package python3.
-(Reading database ... 
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(Reading database ... 95%
(Reading database ... 100%
(Reading database ... 22098 files and directories currently installed.)
+(Reading database ... 
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(Reading database ... 22148 files and directories currently installed.)
 Preparing to unpack .../000-python3_3.13.1-2_amd64.deb ...
 Unpacking python3 (3.13.1-2) ...
 Selecting previously unselected package sensible-utils.
@@ -1176,8 +1208,8 @@
 Setting up tzdata (2025a-2) ...
 
 Current default time zone: 'Etc/UTC'
-Local time is now:      Tue Feb 18 01:36:05 UTC 2025.
-Universal Time is now:  Tue Feb 18 01:36:05 UTC 2025.
+Local time is now:      Mon Mar 23 08:17:22 UTC 2026.
+Universal Time is now:  Mon Mar 23 08:17:22 UTC 2026.
 Run 'dpkg-reconfigure tzdata' if you wish to change it.
 
 Setting up libxcb-present0:amd64 (1.17.0-2+b1) ...
@@ -1408,7 +1440,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/cb2bib-2.0.1/ && 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  > ../cb2bib_2.0.1-3_source.changes
+I: user script /srv/workspace/pbuilder/4134898/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for unstable
+I: user script /srv/workspace/pbuilder/4134898/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/cb2bib-2.0.1/ && 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  > ../cb2bib_2.0.1-3_source.changes
 dpkg-buildpackage: info: source package cb2bib
 dpkg-buildpackage: info: source version 2.0.1-3
 dpkg-buildpackage: info: source distribution unstable
@@ -3243,7 +3279,7 @@
 make[2]: Nothing to be done for 'check'.
 make[2]: Leaving directory '/build/reproducible-path/cb2bib-2.0.1/debian/build/src'
 make[1]: Leaving directory '/build/reproducible-path/cb2bib-2.0.1/debian/build'
-	rm -fr -- /tmp/dh-xdg-rundir-YDbpQijn
+	rm -fr -- /tmp/dh-xdg-rundir-BSoSn5Xs
    create-stamp debian/debhelper-build-stamp
    dh_testroot -O--no-parallel -O--buildsystem=qmake -O--builddirectory=/build/reproducible-path/cb2bib-2.0.1/debian/build
    dh_prep -O--no-parallel -O--buildsystem=qmake -O--builddirectory=/build/reproducible-path/cb2bib-2.0.1/debian/build
@@ -3309,17 +3345,17 @@
 	install -p -m0644 ./debian/ris2bib.1 debian/cb2bib/usr/share/man/man1/ris2bib.1
 	man-recode --to-code UTF-8 --suffix .dh-new debian/cb2bib/usr/share/man/man1/bib2pdf.1
 	man-recode --to-code UTF-8 --suffix .dh-new debian/cb2bib/usr/share/man/man1/cb2bib.1
-	man-recode --to-code UTF-8 --suffix .dh-new debian/cb2bib/usr/share/man/man1/med2bib.1
 	man-recode --to-code UTF-8 --suffix .dh-new debian/cb2bib/usr/share/man/man1/isi2bib.1
+	man-recode --to-code UTF-8 --suffix .dh-new debian/cb2bib/usr/share/man/man1/med2bib.1
 	man-recode --to-code UTF-8 --suffix .dh-new debian/cb2bib/usr/share/man/man1/ris2bib.1
 	mv debian/cb2bib/usr/share/man/man1/isi2bib.1.dh-new debian/cb2bib/usr/share/man/man1/isi2bib.1
 	chmod 0644 -- debian/cb2bib/usr/share/man/man1/isi2bib.1
-	mv debian/cb2bib/usr/share/man/man1/bib2pdf.1.dh-new debian/cb2bib/usr/share/man/man1/bib2pdf.1
-	chmod 0644 -- debian/cb2bib/usr/share/man/man1/bib2pdf.1
 	mv debian/cb2bib/usr/share/man/man1/cb2bib.1.dh-new debian/cb2bib/usr/share/man/man1/cb2bib.1
 	chmod 0644 -- debian/cb2bib/usr/share/man/man1/cb2bib.1
 	mv debian/cb2bib/usr/share/man/man1/med2bib.1.dh-new debian/cb2bib/usr/share/man/man1/med2bib.1
 	chmod 0644 -- debian/cb2bib/usr/share/man/man1/med2bib.1
+	mv debian/cb2bib/usr/share/man/man1/bib2pdf.1.dh-new debian/cb2bib/usr/share/man/man1/bib2pdf.1
+	chmod 0644 -- debian/cb2bib/usr/share/man/man1/bib2pdf.1
 	mv debian/cb2bib/usr/share/man/man1/ris2bib.1.dh-new debian/cb2bib/usr/share/man/man1/ris2bib.1
 	chmod 0644 -- debian/cb2bib/usr/share/man/man1/ris2bib.1
    dh_installsystemduser -O--no-parallel -O--buildsystem=qmake -O--builddirectory=/build/reproducible-path/cb2bib-2.0.1/debian/build
@@ -3391,8 +3427,8 @@
    dh_builddeb -O--no-parallel -O--buildsystem=qmake -O--builddirectory=/build/reproducible-path/cb2bib-2.0.1/debian/build
 	dpkg-deb --root-owner-group --build debian/cb2bib ..
 	dpkg-deb --root-owner-group --build debian/.debhelper/cb2bib/dbgsym-root ..
-dpkg-deb: building package 'cb2bib' in '../cb2bib_2.0.1-3_amd64.deb'.
 dpkg-deb: building package 'cb2bib-dbgsym' in '../cb2bib-dbgsym_2.0.1-3_amd64.deb'.
+dpkg-deb: building package 'cb2bib' in '../cb2bib_2.0.1-3_amd64.deb'.
  dpkg-genbuildinfo --build=binary -O../cb2bib_2.0.1-3_amd64.buildinfo
  dpkg-genchanges --build=binary -O../cb2bib_2.0.1-3_amd64.changes
 dpkg-genchanges: info: binary-only upload (no source code included)
@@ -3400,12 +3436,14 @@
 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/4134898/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/4134898/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/1554138 and its subdirectories
-I: Current time: Mon Feb 17 13:53:29 -12 2025
-I: pbuilder-time-stamp: 1739843609
+I: removing directory /srv/workspace/pbuilder/4134898 and its subdirectories
+I: Current time: Mon Mar 23 22:24:20 +14 2026
+I: pbuilder-time-stamp: 1774254260