Diff of the two buildlogs:

--
--- b1/build.log	2024-05-22 19:36:33.137867938 +0000
+++ b2/build.log	2024-05-22 19:37:15.848052743 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Wed May 22 07:35:45 -12 2024
-I: pbuilder-time-stamp: 1716406545
+I: Current time: Wed Jun 25 15:59:35 +14 2025
+I: pbuilder-time-stamp: 1750816775
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/unstable-reproducible-base.tgz]
 I: copying local configuration
@@ -27,53 +27,85 @@
 dpkg-source: info: unpacking ocaml-gstreamer_0.3.1-4.debian.tar.xz
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/15030/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/13589/tmp/hooks/D01_modify_environment starting
+debug: Running on infom08-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 Jun 25 01:59 /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/13589/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/13589/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=6 '
-  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]="21" [3]="1" [4]="release" [5]="i686-pc-linux-gnu")
+  BASH_VERSION='5.2.21(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=5 '
+  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='dfcf36788c66413a9f2dbcb0f53ef627'
-  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='15030'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=11f734cad39d45b2b14c41d52c2ca13a
+  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=13589
   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.dXMgozFR/pbuilderrc_8flv --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.dXMgozFR/b1 --logfile b1/build.log ocaml-gstreamer_0.3.1-4.dsc'
-  SUDO_GID='111'
-  SUDO_UID='104'
-  SUDO_USER='jenkins'
-  TERM='unknown'
-  TZ='/usr/share/zoneinfo/Etc/GMT+12'
-  USER='root'
-  _='/usr/bin/systemd-run'
+  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.dXMgozFR/pbuilderrc_1tMw --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.dXMgozFR/b2 --logfile b2/build.log ocaml-gstreamer_0.3.1-4.dsc'
+  SUDO_GID=111
+  SUDO_UID=104
+  SUDO_USER=jenkins
+  TERM=unknown
+  TZ=/usr/share/zoneinfo/Etc/GMT-14
+  UID=0
+  USER=root
+  _='I: set'
 I: uname -a
-  Linux infom07-i386 6.1.0-21-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.90-1 (2024-05-03) x86_64 GNU/Linux
+  Linux i-capture-the-hostname 6.7.12+bpo-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.7.12-1~bpo12+1 (2024-05-06) x86_64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 May 21 07:42 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/15030/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Jun 24 14:05 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/13589/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -322,7 +354,7 @@
 Get: 169 http://deb.debian.org/debian unstable/main i386 libgudev-1.0-dev i386 238-5 [29.1 kB]
 Get: 170 http://deb.debian.org/debian unstable/main i386 libgstreamer-plugins-base1.0-dev i386 1.24.3-1 [536 kB]
 Get: 171 http://deb.debian.org/debian unstable/main i386 ocaml-dune i386 3.14.0-1 [4126 kB]
-Fetched 216 MB in 2s (99.5 MB/s)
+Fetched 216 MB in 2s (97.1 MB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 Selecting previously unselected package libpython3.11-minimal:i386.
 (Reading database ... 
(Reading database ... 5%
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(Reading database ... 85%
(Reading database ... 90%
(Reading database ... 95%
(Reading database ... 100%
(Reading database ... 19703 files and directories currently installed.)
@@ -878,8 +910,8 @@
 Setting up tzdata (2024a-4) ...
 
 Current default time zone: 'Etc/UTC'
-Local time is now:      Wed May 22 19:36:21 UTC 2024.
-Universal Time is now:  Wed May 22 19:36:21 UTC 2024.
+Local time is now:      Wed Jun 25 02:00:02 UTC 2025.
+Universal Time is now:  Wed Jun 25 02:00:02 UTC 2025.
 Run 'dpkg-reconfigure tzdata' if you wish to change it.
 
 Setting up libcap2-bin (1:2.66-5) ...
@@ -1035,7 +1067,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/ocaml-gstreamer-0.3.1/ && 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  > ../ocaml-gstreamer_0.3.1-4_source.changes
+I: user script /srv/workspace/pbuilder/13589/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for unstable
+I: user script /srv/workspace/pbuilder/13589/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/ocaml-gstreamer-0.3.1/ && 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  > ../ocaml-gstreamer_0.3.1-4_source.changes
 dpkg-buildpackage: info: source package ocaml-gstreamer
 dpkg-buildpackage: info: source version 0.3.1-4
 dpkg-buildpackage: info: source distribution unstable
@@ -1056,7 +1092,7 @@
    dh_ocamlinit -O--buildsystem=ocaml_dune
    dh_auto_configure -O--buildsystem=ocaml_dune
    dh_auto_build -O--buildsystem=ocaml_dune
-	dune build -j 6 -p gstreamer
+	dune build -j 5 -p gstreamer
 (cd _build/default/src && /usr/bin/i686-linux-gnu-gcc -Wl,-z,notext -O2 -fno-strict-aliasing -fwrapv -pthread -fPIC -g -O2 -fstack-protector-strong -Wformat -Werror=format-security -D_FILE_OFFSET_BITS=64 -Wdate-time -D_FORTIFY_SOURCE=2 -I/usr/include/gstreamer-1.0 -I/usr/include/glib-2.0 -I/usr/lib/i386-linux-gnu/glib-2.0/include -I/usr/include/sysprof-6 -I/usr/include/i386-linux-gnu -pthread -g -I /usr/lib/ocaml -I /usr/lib/ocaml/threads -o gstreamer_stubs.o -c gstreamer_stubs.c)
 In file included from /usr/include/glib-2.0/glib/giochannel.h:35,
                  from /usr/include/glib-2.0/glib.h:56,
@@ -1126,7 +1162,7 @@
    87 |   GstFlowReturn (*alloc)  (GstPushSrc *src, GstBuffer **buf);
       |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~    
    dh_auto_test -O--buildsystem=ocaml_dune
-	dune runtest -j 6 -p gstreamer
+	dune runtest -j 5 -p gstreamer
    create-stamp debian/debhelper-build-stamp
    dh_testroot -O--buildsystem=ocaml_dune
    dh_prep -O--buildsystem=ocaml_dune
@@ -1163,12 +1199,14 @@
 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/13589/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/13589/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/15030 and its subdirectories
-I: Current time: Wed May 22 07:36:32 -12 2024
-I: pbuilder-time-stamp: 1716406592
+I: removing directory /srv/workspace/pbuilder/13589 and its subdirectories
+I: Current time: Wed Jun 25 16:00:14 +14 2025
+I: pbuilder-time-stamp: 1750816814