Diff of the two buildlogs:

--
--- b1/build.log	2024-12-18 09:27:00.996864517 +0000
+++ b2/build.log	2024-12-18 09:27:35.919278275 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Tue Jan 20 03:49:12 -12 2026
-I: pbuilder-time-stamp: 1768924152
+I: Current time: Wed Jan 21 05:50:03 +14 2026
+I: pbuilder-time-stamp: 1768924203
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/trixie-reproducible-base.tgz]
 I: copying local configuration
@@ -25,52 +25,84 @@
 dpkg-source: info: unpacking libbibtex-parser-perl_1.05+dfsg-1.debian.tar.xz
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/1318034/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/993659/tmp/hooks/D01_modify_environment starting
+debug: Running on codethink01-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 20 15:50 /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/993659/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/993659/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='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='999dd4fb1c884394bf2dc4d9d5062d12'
-  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='1318034'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=7c2b3874e6634126a09b4f2e4b0ddc00
+  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=993659
   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.7oLFBBPc/pbuilderrc_4g3L --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.7oLFBBPc/b1 --logfile b1/build.log libbibtex-parser-perl_1.05+dfsg-1.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.7oLFBBPc/pbuilderrc_xD9d --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.7oLFBBPc/b2 --logfile b2/build.log libbibtex-parser-perl_1.05+dfsg-1.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 codethink03-arm64 6.1.0-28-cloud-arm64 #1 SMP Debian 6.1.119-1 (2024-11-22) aarch64 GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-28-cloud-arm64 #1 SMP Debian 6.1.119-1 (2024-11-22) aarch64 GNU/Linux
 I: ls -l /bin
   lrwxrwxrwx 1 root root 7 Nov 22  2024 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/1318034/tmp/hooks/D02_print_environment finished
+I: user script /srv/workspace/pbuilder/993659/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -141,7 +173,7 @@
 Get: 29 http://deb.debian.org/debian trixie/main arm64 debhelper all 13.20 [915 kB]
 Get: 30 http://deb.debian.org/debian trixie/main arm64 libio-string-perl all 1.08-4 [12.1 kB]
 Get: 31 http://deb.debian.org/debian trixie/main arm64 liblatex-tounicode-perl all 0.55-1 [28.8 kB]
-Fetched 19.5 MB in 0s (58.0 MB/s)
+Fetched 19.5 MB in 0s (105 MB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 Selecting previously unselected package sensible-utils.
 (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 ... 20076 files and directories currently installed.)
@@ -280,7 +312,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/libbibtex-parser-perl-1.05+dfsg/ && 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  > ../libbibtex-parser-perl_1.05+dfsg-1_source.changes
+I: user script /srv/workspace/pbuilder/993659/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for trixie
+I: user script /srv/workspace/pbuilder/993659/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/libbibtex-parser-perl-1.05+dfsg/ && 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  > ../libbibtex-parser-perl_1.05+dfsg-1_source.changes
 dpkg-buildpackage: info: source package libbibtex-parser-perl
 dpkg-buildpackage: info: source version 1.05+dfsg-1
 dpkg-buildpackage: info: source distribution unstable
@@ -307,9 +343,9 @@
    dh_auto_build
 	make -j12
 make[1]: Entering directory '/build/reproducible-path/libbibtex-parser-perl-1.05+dfsg'
+cp lib/BibTeX/Parser.pm blib/lib/BibTeX/Parser.pm
 cp lib/BibTeX/Parser/Entry.pm blib/lib/BibTeX/Parser/Entry.pm
 cp lib/BibTeX/Parser/Author.pm blib/lib/BibTeX/Parser/Author.pm
-cp lib/BibTeX/Parser.pm blib/lib/BibTeX/Parser.pm
 Manifying 3 pod documents
 make[1]: Leaving directory '/build/reproducible-path/libbibtex-parser-perl-1.05+dfsg'
    dh_auto_test
@@ -376,200 +412,200 @@
 ok 3 - Initial state 'von'
 ok 4 - Initial state 'last'
 ok 5 - Initial state 'jr'
-ok 6 - von Smith, Jr., Robert
+ok 6 - Lopez Fernandez, Miguel
 ok 7 - An object of class 'BibTeX::Parser::Author' isa 'BibTeX::Parser::Author'
 ok 8
 ok 9
 ok 10
 ok 11
-ok 12 - von Tetteh-Lartey, N.
+ok 12 - whitespace name: '
+# '
 ok 13 - An object of class 'BibTeX::Parser::Author' isa 'BibTeX::Parser::Author'
 ok 14
 ok 15
 ok 16
 ok 17
-ok 18 - von Neumann
+ok 18 - Arthur O'Malley
 ok 19 - An object of class 'BibTeX::Parser::Author' isa 'BibTeX::Parser::Author'
 ok 20
 ok 21
 ok 22
 ok 23
-ok 24 - Johannes Martinus Albertus van de Groene Heide
+ok 24 - von Smith, Jr., Robert
 ok 25 - An object of class 'BibTeX::Parser::Author' isa 'BibTeX::Parser::Author'
 ok 26
 ok 27
 ok 28
 ok 29
-ok 30 - whitespace name: ''
+ok 30 - Thomas von Neumann
 ok 31 - An object of class 'BibTeX::Parser::Author' isa 'BibTeX::Parser::Author'
 ok 32
 ok 33
 ok 34
 ok 35
-ok 36 - Thomas von Neumann
+ok 36 - M"uller, L.M.
 ok 37 - An object of class 'BibTeX::Parser::Author' isa 'BibTeX::Parser::Author'
 ok 38
 ok 39
 ok 40
 ok 41
-ok 42 - Ludwigg {van Beethoven}
+ok 42 - O'Malley, Arthur
 ok 43 - An object of class 'BibTeX::Parser::Author' isa 'BibTeX::Parser::Author'
 ok 44
 ok 45
 ok 46
 ok 47
-ok 48 - Maria-Victoria Delgrande
+ok 48 - A. O'Malley
 ok 49 - An object of class 'BibTeX::Parser::Author' isa 'BibTeX::Parser::Author'
 ok 50
 ok 51
 ok 52
 ok 53
-ok 54 - Donald E. Knuth
+ok 54 - Johannes Martinus Albertus van de Groene Heide
 ok 55 - An object of class 'BibTeX::Parser::Author' isa 'BibTeX::Parser::Author'
 ok 56
 ok 57
 ok 58
 ok 59
-ok 60 - O'Malley, A.
+ok 60 - Pierre de la Porte
 ok 61 - An object of class 'BibTeX::Parser::Author' isa 'BibTeX::Parser::Author'
 ok 62
 ok 63
 ok 64
 ok 65
-ok 66 - von Tetteh-Lartey, Jr.,  N.
+ok 66 - O'Malley, A.
 ok 67 - An object of class 'BibTeX::Parser::Author' isa 'BibTeX::Parser::Author'
 ok 68
 ok 69
 ok 70
 ok 71
-ok 72 - Pierre de la Porte
+ok 72 - whitespace name: '   '
 ok 73 - An object of class 'BibTeX::Parser::Author' isa 'BibTeX::Parser::Author'
 ok 74
 ok 75
 ok 76
 ok 77
-ok 78 - N. Tetteh-Lartey
+ok 78 - M\"uller, L.M.
 ok 79 - An object of class 'BibTeX::Parser::Author' isa 'BibTeX::Parser::Author'
 ok 80
 ok 81
 ok 82
 ok 83
-ok 84 - M"uller, L.M.
+ok 84 - {van Beethoven}, Ludwig
 ok 85 - An object of class 'BibTeX::Parser::Author' isa 'BibTeX::Parser::Author'
 ok 86
 ok 87
 ok 88
 ok 89
-ok 90 - Arthur O'Malley
+ok 90 - von Neumann, Thomas
 ok 91 - An object of class 'BibTeX::Parser::Author' isa 'BibTeX::Parser::Author'
 ok 92
 ok 93
 ok 94
 ok 95
-ok 96 - Lopez Fernandez, Miguel
+ok 96 - et.~al.
 ok 97 - An object of class 'BibTeX::Parser::Author' isa 'BibTeX::Parser::Author'
 ok 98
 ok 99
 ok 100
 ok 101
-ok 102 - Anonymous
+ok 102 - al.
 ok 103 - An object of class 'BibTeX::Parser::Author' isa 'BibTeX::Parser::Author'
 ok 104
 ok 105
 ok 106
 ok 107
-ok 108 - Smith, Jr., Robert
+ok 108 - Ludwigg {van Beethoven}
 ok 109 - An object of class 'BibTeX::Parser::Author' isa 'BibTeX::Parser::Author'
 ok 110
 ok 111
 ok 112
 ok 113
-ok 114 - O'Malley, Arthur
+ok 114 - Smith, Jr., Robert
 ok 115 - An object of class 'BibTeX::Parser::Author' isa 'BibTeX::Parser::Author'
 ok 116
 ok 117
 ok 118
 ok 119
-ok 120 - M\"uller, L.M.
+ok 120 - von Neumann
 ok 121 - An object of class 'BibTeX::Parser::Author' isa 'BibTeX::Parser::Author'
 ok 122
 ok 123
 ok 124
 ok 125
-ok 126 - whitespace name: '
-# '
+ok 126 - John Chris Smith
 ok 127 - An object of class 'BibTeX::Parser::Author' isa 'BibTeX::Parser::Author'
 ok 128
 ok 129
 ok 130
 ok 131
-ok 132 - whitespace name: '   '
+ok 132 - Donald E. Knuth
 ok 133 - An object of class 'BibTeX::Parser::Author' isa 'BibTeX::Parser::Author'
 ok 134
 ok 135
 ok 136
 ok 137
-ok 138 - van Beethoven, Ludwig
+ok 138 - {Barnes and Noble, Inc.}
 ok 139 - An object of class 'BibTeX::Parser::Author' isa 'BibTeX::Parser::Author'
 ok 140
 ok 141
 ok 142
 ok 143
-ok 144 - von Neumann, Thomas
+ok 144 - N. Tetteh-Lartey
 ok 145 - An object of class 'BibTeX::Parser::Author' isa 'BibTeX::Parser::Author'
 ok 146
 ok 147
 ok 148
 ok 149
-ok 150 - L.M. M\"uller
+ok 150 - L.M. M"uller
 ok 151 - An object of class 'BibTeX::Parser::Author' isa 'BibTeX::Parser::Author'
 ok 152
 ok 153
 ok 154
 ok 155
-ok 156 - Smith, John Chris
+ok 156 - Maria-Victoria Delgrande
 ok 157 - An object of class 'BibTeX::Parser::Author' isa 'BibTeX::Parser::Author'
 ok 158
 ok 159
 ok 160
 ok 161
-ok 162 - {van Beethoven}, Ludwig
+ok 162 - Smith, John Chris
 ok 163 - An object of class 'BibTeX::Parser::Author' isa 'BibTeX::Parser::Author'
 ok 164
 ok 165
 ok 166
 ok 167
-ok 168 - A. O'Malley
+ok 168 - whitespace name: ''
 ok 169 - An object of class 'BibTeX::Parser::Author' isa 'BibTeX::Parser::Author'
 ok 170
 ok 171
 ok 172
 ok 173
-ok 174 - John Chris Smith
+ok 174 - Anonymous
 ok 175 - An object of class 'BibTeX::Parser::Author' isa 'BibTeX::Parser::Author'
 ok 176
 ok 177
 ok 178
 ok 179
-ok 180 - L.M. M"uller
+ok 180 - von Tetteh-Lartey, Jr.,  N.
 ok 181 - An object of class 'BibTeX::Parser::Author' isa 'BibTeX::Parser::Author'
 ok 182
 ok 183
 ok 184
 ok 185
-ok 186 - {Barnes and Noble, Inc.}
+ok 186 - L.M. M\"uller
 ok 187 - An object of class 'BibTeX::Parser::Author' isa 'BibTeX::Parser::Author'
 ok 188
 ok 189
 ok 190
 ok 191
-ok 192 - al.
+ok 192 - von Tetteh-Lartey, N.
 ok 193 - An object of class 'BibTeX::Parser::Author' isa 'BibTeX::Parser::Author'
 ok 194
 ok 195
 ok 196
 ok 197
-ok 198 - et.~al.
+ok 198 - van Beethoven, Ludwig
 ok 199 - An object of class 'BibTeX::Parser::Author' isa 'BibTeX::Parser::Author'
 ok 200
 ok 201
@@ -812,7 +848,7 @@
 t/release-pod-coverage.t .. skipped: these tests are for release candidate testing
 t/release-pod-syntax.t .... skipped: these tests are for release candidate testing
 All tests successful.
-Files=22, Tests=422,  6 wallclock secs ( 0.09 usr  0.04 sys +  1.54 cusr  0.31 csys =  1.98 CPU)
+Files=22, Tests=422,  2 wallclock secs ( 0.12 usr  0.05 sys +  1.94 cusr  0.39 csys =  2.50 CPU)
 Result: PASS
 make[1]: Leaving directory '/build/reproducible-path/libbibtex-parser-perl-1.05+dfsg'
    create-stamp debian/debhelper-build-stamp
@@ -849,12 +885,14 @@
 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/993659/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/993659/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/1318034 and its subdirectories
-I: Current time: Tue Jan 20 03:49:59 -12 2026
-I: pbuilder-time-stamp: 1768924199
+I: removing directory /srv/workspace/pbuilder/993659 and its subdirectories
+I: Current time: Wed Jan 21 05:50:33 +14 2026
+I: pbuilder-time-stamp: 1768924233