Diff of the two buildlogs:

--
--- b1/build.log	2025-03-20 15:10:56.154447185 +0000
+++ b2/build.log	2025-03-20 15:12:20.222646095 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Wed Apr 22 09:33:10 -12 2026
-I: pbuilder-time-stamp: 1776893590
+I: Current time: Fri Mar 21 05:11:01 +14 2025
+I: pbuilder-time-stamp: 1742483461
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/unstable-reproducible-base.tgz]
 I: copying local configuration
@@ -25,54 +25,86 @@
 dpkg-source: info: applying docs
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/86260/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/48230/tmp/hooks/D01_modify_environment starting
+debug: Running on ionos12-i386.
+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 20 15:11 /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/48230/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/48230/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='i386'
-  DEBIAN_FRONTEND='noninteractive'
-  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=22 '
-  DISTRIBUTION='unstable'
-  HOME='/root'
-  HOST_ARCH='i386'
+  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]="i686-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=i386
+  DEBIAN_FRONTEND=noninteractive
+  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=10 '
+  DIRSTACK=()
+  DISTRIBUTION=unstable
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=i686
+  HOST_ARCH=i386
   IFS=' 	
   '
-  INVOCATION_ID='0ddd8c3b61ef40a6b0de9022235e47f9'
-  LANG='C'
-  LANGUAGE='en_US:en'
-  LC_ALL='C'
-  LD_LIBRARY_PATH='/usr/lib/libeatmydata'
-  LD_PRELOAD='libeatmydata.so'
-  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='86260'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=a9b810e2aaa44a9686d29f26252a3cc5
+  LANG=C
+  LANGUAGE=de_CH:de
+  LC_ALL=C
+  LD_LIBRARY_PATH=/usr/lib/libeatmydata
+  LD_PRELOAD=libeatmydata.so
+  MACHTYPE=i686-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=48230
   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.uGBvdj23/pbuilderrc_MV0t --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.uGBvdj23/b1 --logfile b1/build.log pymupdf_1.25.4+ds1-1.dsc'
-  SUDO_GID='112'
-  SUDO_UID='107'
-  SUDO_USER='jenkins'
-  TERM='unknown'
-  TZ='/usr/share/zoneinfo/Etc/GMT+12'
-  USER='root'
-  _='/usr/bin/systemd-run'
-  http_proxy='http://213.165.73.152:3128'
+  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.uGBvdj23/pbuilderrc_Uksb --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.uGBvdj23/b2 --logfile b2/build.log pymupdf_1.25.4+ds1-1.dsc'
+  SUDO_GID=112
+  SUDO_UID=107
+  SUDO_USER=jenkins
+  TERM=unknown
+  TZ=/usr/share/zoneinfo/Etc/GMT-14
+  UID=0
+  USER=root
+  _='I: set'
+  http_proxy=http://46.16.76.132:3128
 I: uname -a
-  Linux ionos6-i386 6.1.0-32-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.129-1 (2025-03-06) x86_64 GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-32-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.129-1 (2025-03-06) x86_64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 Mar  4  2025 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/86260/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Mar  4 11:20 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/48230/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -205,7 +237,7 @@
 Get: 82 http://deb.debian.org/debian unstable/main i386 python3-all-dev i386 3.13.2-2 [1068 B]
 Get: 83 http://deb.debian.org/debian unstable/main i386 python3-mupdf i386 1.25.1+ds1-5+b2 [1885 kB]
 Get: 84 http://deb.debian.org/debian unstable/main i386 swig i386 4.3.0-1 [1570 kB]
-Fetched 77.7 MB in 2s (49.1 MB/s)
+Fetched 77.7 MB in 2s (48.7 MB/s)
 Preconfiguring packages ...
 Selecting previously unselected package libpython3.13-minimal:i386.
 (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 ... 19770 files and directories currently installed.)
@@ -488,8 +520,8 @@
 Setting up tzdata (2025a-2) ...
 
 Current default time zone: 'Etc/UTC'
-Local time is now:      Wed Apr 22 21:33:34 UTC 2026.
-Universal Time is now:  Wed Apr 22 21:33:34 UTC 2026.
+Local time is now:      Thu Mar 20 15:11:43 UTC 2025.
+Universal Time is now:  Thu Mar 20 15:11:43 UTC 2025.
 Run 'dpkg-reconfigure tzdata' if you wish to change it.
 
 Setting up autotools-dev (20220109.1) ...
@@ -569,7 +601,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/pymupdf-1.25.4+ds1/ && 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  > ../pymupdf_1.25.4+ds1-1_source.changes
+I: user script /srv/workspace/pbuilder/48230/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for unstable
+I: user script /srv/workspace/pbuilder/48230/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/pymupdf-1.25.4+ds1/ && 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  > ../pymupdf_1.25.4+ds1-1_source.changes
 dpkg-buildpackage: info: source package pymupdf
 dpkg-buildpackage: info: source version 1.25.4+ds1-1
 dpkg-buildpackage: info: source distribution unstable
@@ -603,12 +639,12 @@
 pymupdf-1.25.4+ds1/setup.py: sys.argv (3):
 pymupdf-1.25.4+ds1/setup.py:     0: '/usr/lib/python3/dist-packages/pyproject_hooks/_in_process/_in_process.py'
 pymupdf-1.25.4+ds1/setup.py:     1: 'build_wheel'
-pymupdf-1.25.4+ds1/setup.py:     2: '/tmp/tmpoaxkn69w'
+pymupdf-1.25.4+ds1/setup.py:     2: '/tmp/tmpdjukbg3s'
 pymupdf-1.25.4+ds1/setup.py: os.environ (103):
 pymupdf-1.25.4+ds1/setup.py:     ASFLAGS: ''
 pymupdf-1.25.4+ds1/setup.py:     ASFLAGS_FOR_BUILD: ''
-pymupdf-1.25.4+ds1/setup.py:     BUILDUSERGECOS: 'first user,first room,first work-phone,first home-phone,first other'
-pymupdf-1.25.4+ds1/setup.py:     BUILDUSERNAME: 'pbuilder1'
+pymupdf-1.25.4+ds1/setup.py:     BUILDUSERGECOS: 'second user,second room,second work-phone,second home-phone,second other'
+pymupdf-1.25.4+ds1/setup.py:     BUILDUSERNAME: 'pbuilder2'
 pymupdf-1.25.4+ds1/setup.py:     CCACHE_DIR: '/build/reproducible-path/pymupdf-1.25.4+ds1/.pybuild/ccache'
 pymupdf-1.25.4+ds1/setup.py:     CFLAGS: '-g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/pymupdf-1.25.4+ds1=. -fstack-protector-strong -Wformat -Werror=format-security'
 pymupdf-1.25.4+ds1/setup.py:     CFLAGS_FOR_BUILD: '-g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/pymupdf-1.25.4+ds1=. -fstack-protector-strong -Wformat -Werror=format-security'
@@ -629,7 +665,7 @@
 pymupdf-1.25.4+ds1/setup.py:     DEB_BUILD_GNU_TYPE: 'i686-linux-gnu'
 pymupdf-1.25.4+ds1/setup.py:     DEB_BUILD_MAINT_OPTIONS: 'hardening=+all'
 pymupdf-1.25.4+ds1/setup.py:     DEB_BUILD_MULTIARCH: 'i386-linux-gnu'
-pymupdf-1.25.4+ds1/setup.py:     DEB_BUILD_OPTIONS: 'buildinfo=+all reproducible=+all parallel=22 '
+pymupdf-1.25.4+ds1/setup.py:     DEB_BUILD_OPTIONS: 'buildinfo=+all reproducible=+all parallel=10 '
 pymupdf-1.25.4+ds1/setup.py:     DEB_HOST_ARCH: 'i386'
 pymupdf-1.25.4+ds1/setup.py:     DEB_HOST_ARCH_ABI: 'base'
 pymupdf-1.25.4+ds1/setup.py:     DEB_HOST_ARCH_BITS: '32'
@@ -663,15 +699,15 @@
 pymupdf-1.25.4+ds1/setup.py:     FFLAGS_FOR_BUILD: '-g -O2 -ffile-prefix-map=/build/reproducible-path/pymupdf-1.25.4+ds1=. -fstack-protector-strong'
 pymupdf-1.25.4+ds1/setup.py:     FLIT_NO_NETWORK: '1'
 pymupdf-1.25.4+ds1/setup.py:     HOME: '/build/reproducible-path/pymupdf-1.25.4+ds1/.pybuild/cpython3_3.13'
-pymupdf-1.25.4+ds1/setup.py:     INVOCATION_ID: '4cec8478ee204634b495fa933910d17f'
+pymupdf-1.25.4+ds1/setup.py:     INVOCATION_ID: 'd9336f90fff141199501eee5cb5c1188'
 pymupdf-1.25.4+ds1/setup.py:     LANG: 'C'
-pymupdf-1.25.4+ds1/setup.py:     LANGUAGE: 'en_US:en'
+pymupdf-1.25.4+ds1/setup.py:     LANGUAGE: 'de_CH:de'
 pymupdf-1.25.4+ds1/setup.py:     LC_ALL: 'C'
 pymupdf-1.25.4+ds1/setup.py:     LDFLAGS: '-Wl,-z,relro -Wl,-z,now'
 pymupdf-1.25.4+ds1/setup.py:     LDFLAGS_FOR_BUILD: '-Wl,-z,relro -Wl,-z,now'
 pymupdf-1.25.4+ds1/setup.py:     LD_LIBRARY_PATH: '/usr/lib/libeatmydata'
 pymupdf-1.25.4+ds1/setup.py:     LD_PRELOAD: ''
-pymupdf-1.25.4+ds1/setup.py:     LOGNAME: 'pbuilder1'
+pymupdf-1.25.4+ds1/setup.py:     LOGNAME: 'pbuilder2'
 pymupdf-1.25.4+ds1/setup.py:     MAIL: '/var/mail/root'
 pymupdf-1.25.4+ds1/setup.py:     MAKEFLAGS: ''
 pymupdf-1.25.4+ds1/setup.py:     MAKELEVEL: '1'
@@ -681,7 +717,7 @@
 pymupdf-1.25.4+ds1/setup.py:     OBJCXXFLAGS: '-g -O2 -ffile-prefix-map=/build/reproducible-path/pymupdf-1.25.4+ds1=. -fstack-protector-strong -Wformat -Werror=format-security'
 pymupdf-1.25.4+ds1/setup.py:     OBJCXXFLAGS_FOR_BUILD: '-g -O2 -ffile-prefix-map=/build/reproducible-path/pymupdf-1.25.4+ds1=. -fstack-protector-strong -Wformat -Werror=format-security'
 pymupdf-1.25.4+ds1/setup.py:     OLDPWD: '/'
-pymupdf-1.25.4+ds1/setup.py:     PATH: '/usr/sbin:/usr/bin:/sbin:/bin:/usr/games'
+pymupdf-1.25.4+ds1/setup.py:     PATH: '/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/i/capture/the/path'
 pymupdf-1.25.4+ds1/setup.py:     PBCURRENTCOMMANDLINEOPERATION: 'build'
 pymupdf-1.25.4+ds1/setup.py:     PBUILDER_OPERATION: 'build'
 pymupdf-1.25.4+ds1/setup.py:     PBUILDER_PKGDATADIR: '/usr/share/pbuilder'
@@ -692,16 +728,16 @@
 pymupdf-1.25.4+ds1/setup.py:     PYMUPDF_SETUP_MUPDF_BUILD: ''
 pymupdf-1.25.4+ds1/setup.py:     PYTHONPATH: '/build/reproducible-path/pymupdf-1.25.4+ds1/.pybuild/cpython3_3.13/build'
 pymupdf-1.25.4+ds1/setup.py:     SHELL: '/bin/bash'
-pymupdf-1.25.4+ds1/setup.py:     SHLVL: '2'
+pymupdf-1.25.4+ds1/setup.py:     SHLVL: '3'
 pymupdf-1.25.4+ds1/setup.py:     SOURCE_DATE_EPOCH: '1742334165'
-pymupdf-1.25.4+ds1/setup.py:     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.uGBvdj23/pbuilderrc_MV0t --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.uGBvdj23/b1 --logfile b1/build.log pymupdf_1.25.4+ds1-1.dsc'
+pymupdf-1.25.4+ds1/setup.py:     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.uGBvdj23/pbuilderrc_Uksb --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.uGBvdj23/b2 --logfile b2/build.log pymupdf_1.25.4+ds1-1.dsc'
 pymupdf-1.25.4+ds1/setup.py:     SUDO_GID: '112'
 pymupdf-1.25.4+ds1/setup.py:     SUDO_UID: '107'
 pymupdf-1.25.4+ds1/setup.py:     SUDO_USER: 'jenkins'
 pymupdf-1.25.4+ds1/setup.py:     TERM: 'unknown'
-pymupdf-1.25.4+ds1/setup.py:     TZ: '/usr/share/zoneinfo/Etc/GMT+12'
-pymupdf-1.25.4+ds1/setup.py:     USER: 'pbuilder1'
-pymupdf-1.25.4+ds1/setup.py:     _: '/usr/bin/unshare'
+pymupdf-1.25.4+ds1/setup.py:     TZ: '/usr/share/zoneinfo/Etc/GMT-14'
+pymupdf-1.25.4+ds1/setup.py:     USER: 'pbuilder2'
+pymupdf-1.25.4+ds1/setup.py:     _: '/usr/bin/python3.13'
 pymupdf-1.25.4+ds1/setup.py:     _PYPROJECT_HOOKS_BACKEND_PATH: '/build/reproducible-path/pymupdf-1.25.4+ds1'
 pymupdf-1.25.4+ds1/setup.py:     _PYPROJECT_HOOKS_BUILD_BACKEND: 'setup'
 pymupdf-1.25.4+ds1/setup.py:     _PYTHON_HOST_PLATFORM: 'linux-i686'
@@ -810,12 +846,14 @@
 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/48230/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/48230/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/86260 and its subdirectories
-I: Current time: Wed Apr 22 09:33:54 -12 2026
-I: pbuilder-time-stamp: 1776893634
+I: removing directory /srv/workspace/pbuilder/48230 and its subdirectories
+I: Current time: Fri Mar 21 05:12:19 +14 2025
+I: pbuilder-time-stamp: 1742483539