Diff of the two buildlogs:

--
--- b1/build.log	2023-04-12 11:13:30.403967513 +0000
+++ b2/build.log	2023-04-12 11:14:50.510658832 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Tue Apr 11 23:12:15 -12 2023
-I: pbuilder-time-stamp: 1681297935
+I: Current time: Wed May 15 07:36:34 +14 2024
+I: pbuilder-time-stamp: 1715708194
 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 [./libctapimkt_1.0.5~rc1.orig.tar.xz]
 I: copying [./libctapimkt_1.0.5~rc1-9.debian.tar.xz]
 I: Extracting source
-gpgv: Signature made Wed Aug 25 20:35:18 2021 -12
+gpgv: Signature made Thu Aug 26 22:35:18 2021 +14
 gpgv:                using RSA key F1F007320A035541F0A663CA578A0494D1C646D1
 gpgv:                issuer "tille@debian.org"
 gpgv: Can't check signature: No public key
@@ -30,11 +30,20 @@
 dpkg-source: info: applying parallel-ftbfs.patch
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/1082/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/29969/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/29969/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/29969/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'
@@ -44,38 +53,38 @@
   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='1082'
+  PPID='29969'
   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.ARGc3jsB/pbuilderrc_k2r8 --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.ARGc3jsB/b1 --logfile b1/build.log libctapimkt_1.0.5~rc1-9.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.ARGc3jsB/pbuilderrc_jeMg --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.ARGc3jsB/b2 --logfile b2/build.log --extrapackages usrmerge libctapimkt_1.0.5~rc1-9.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 codethink16-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/1082/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 May 15 06:47 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/29969/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -294,8 +303,17 @@
 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/libctapimkt-1.0.5~rc1/ && 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  > ../libctapimkt_1.0.5~rc1-9_source.changes
+I: user script /srv/workspace/pbuilder/29969/tmp/hooks/A99_set_merged_usr starting
+Re-configuring usrmerge...
+I: user script /srv/workspace/pbuilder/29969/tmp/hooks/A99_set_merged_usr finished
+hostname: Temporary failure in name resolution
+I: Running cd /build/libctapimkt-1.0.5~rc1/ && 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  > ../libctapimkt_1.0.5~rc1-9_source.changes
 dpkg-buildpackage: info: source package libctapimkt
 dpkg-buildpackage: info: source version 1.0.5~rc1-9
 dpkg-buildpackage: info: source distribution unstable
@@ -479,6 +497,7 @@
 make[2]: Entering directory '/build/libctapimkt-1.0.5~rc1'
 gcc -DHAVE_CONFIG_H -I.   -Wdate-time -D_FORTIFY_SOURCE=2  -g -O2 -ffile-prefix-map=/build/libctapimkt-1.0.5~rc1=. -fstack-protector-strong -Wformat -Werror=format-security -c -o mktlin.o mktlin.c
 /bin/bash ./libtool  --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H -I.   -Wdate-time -D_FORTIFY_SOURCE=2  -g -O2 -ffile-prefix-map=/build/libctapimkt-1.0.5~rc1=. -fstack-protector-strong -Wformat -Werror=format-security -c -o ctapi.lo ctapi.c
+libtool: compile:  gcc -DHAVE_CONFIG_H -I. -Wdate-time -D_FORTIFY_SOURCE=2 -g -O2 "-ffile-prefix-map=/build/libctapimkt-1.0.5~rc1=." -fstack-protector-strong -Wformat -Werror=format-security -c ctapi.c  -fPIC -DPIC -o .libs/ctapi.o
 mktlin.c: In function 'antwort':
 mktlin.c:265:23: warning: format '%s' expects a matching 'char *' argument [-Wformat=]
   265 |     fprintf(karte, "(%s)-Antwort zu kurz");
@@ -494,7 +513,6 @@
 mktlin.c:315:22: warning: too many arguments for format [-Wformat-extra-args]
   315 |       fprintf(karte, "�bertragungsfehler", abschnitt);
       |                      ^~~~~~~~~~~~~~~~~~~~
-libtool: compile:  gcc -DHAVE_CONFIG_H -I. -Wdate-time -D_FORTIFY_SOURCE=2 -g -O2 "-ffile-prefix-map=/build/libctapimkt-1.0.5~rc1=." -fstack-protector-strong -Wformat -Werror=format-security -c ctapi.c  -fPIC -DPIC -o .libs/ctapi.o
 mktlin.c:322:22: warning: too many arguments for format [-Wformat-extra-args]
   322 |       fprintf(karte, "�bertragungsfehler", abschnitt);
       |                      ^~~~~~~~~~~~~~~~~~~~
@@ -640,12 +658,14 @@
 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/29969/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/29969/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/1082 and its subdirectories
-I: Current time: Tue Apr 11 23:13:29 -12 2023
-I: pbuilder-time-stamp: 1681298009
+I: removing directory /srv/workspace/pbuilder/29969 and its subdirectories
+I: Current time: Wed May 15 07:37:49 +14 2024
+I: pbuilder-time-stamp: 1715708269