Diff of the two buildlogs:

--
--- b1/build.log	2024-05-05 13:29:02.627323646 +0000
+++ b2/build.log	2024-05-05 13:31:27.645152598 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Sat Jun  7 07:51:16 -12 2025
-I: pbuilder-time-stamp: 1749325876
+I: Current time: Mon May  6 03:29:05 +14 2024
+I: pbuilder-time-stamp: 1714915745
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/trixie-reproducible-base.tgz]
 I: copying local configuration
@@ -28,52 +28,84 @@
 dpkg-source: info: applying drop_build_pdf.patch
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/1764139/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/783880/tmp/hooks/D01_modify_environment starting
+debug: Running on ionos11-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 May  5 13:29 /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/783880/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/783880/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=42 '
-  DISTRIBUTION='trixie'
-  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]="21" [3]="1" [4]="release" [5]="x86_64-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=amd64
+  DEBIAN_FRONTEND=noninteractive
+  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=20 '
+  DIRSTACK=()
+  DISTRIBUTION=trixie
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=x86_64
+  HOST_ARCH=amd64
   IFS=' 	
   '
-  INVOCATION_ID='e2cc6306114f421095a9b5e84438c1e2'
-  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='1764139'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=4e2da0ab059e4ae7b7b7c8a1b68d2e21
+  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=783880
   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.xgE9Q0B2/pbuilderrc_DmUS --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.xgE9Q0B2/b1 --logfile b1/build.log evilwm_1.4.2-1.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://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.xgE9Q0B2/pbuilderrc_NnpD --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.xgE9Q0B2/b2 --logfile b2/build.log evilwm_1.4.2-1.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://46.16.76.132:3128
 I: uname -a
-  Linux ionos5-amd64 6.6.13+bpo-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.6.13-1~bpo12+1 (2024-02-15) x86_64 GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-20-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.85-1 (2024-04-11) x86_64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 Jun  7 17:46 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/1764139/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 May  3 08:24 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/783880/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -173,7 +205,7 @@
 Get: 52 http://deb.debian.org/debian trixie/main amd64 libxrandr2 amd64 2:1.5.4-1 [36.1 kB]
 Get: 53 http://deb.debian.org/debian trixie/main amd64 libxrender-dev amd64 1:0.9.10-1.1+b1 [35.8 kB]
 Get: 54 http://deb.debian.org/debian trixie/main amd64 libxrandr-dev amd64 2:1.5.4-1 [44.1 kB]
-Fetched 22.8 MB in 0s (130 MB/s)
+Fetched 22.8 MB in 11s (1986 kB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 Selecting previously unselected package sensible-utils.
 (Reading database ... 
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(Reading database ... 100%
(Reading database ... 19695 files and directories currently installed.)
@@ -405,7 +437,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/evilwm-1.4.2/ && 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  > ../evilwm_1.4.2-1_source.changes
+I: user script /srv/workspace/pbuilder/783880/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for trixie
+I: user script /srv/workspace/pbuilder/783880/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/evilwm-1.4.2/ && 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  > ../evilwm_1.4.2-1_source.changes
 dpkg-buildpackage: info: source package evilwm
 dpkg-buildpackage: info: source version 1.4.2-1
 dpkg-buildpackage: info: source distribution unstable
@@ -415,7 +451,7 @@
  debian/rules clean
 dh clean
    dh_auto_clean
-	make -j42 distclean
+	make -j20 distclean
 make[1]: Entering directory '/build/reproducible-path/evilwm-1.4.2'
 rm -f evilwm bind.o client.o client_move.o client_new.o display.o events.o ewmh.o func.o list.o log.o main.o screen.o util.o xconfig.o xmalloc.o
 rm -f config.mk
@@ -428,7 +464,7 @@
    dh_auto_configure
 	./configure --build=x86_64-linux-gnu --prefix=/usr --includedir=\${prefix}/include --mandir=\${prefix}/share/man --infodir=\${prefix}/share/info --sysconfdir=/etc --localstatedir=/var --disable-option-checking --disable-silent-rules --libdir=\${prefix}/lib/x86_64-linux-gnu --runstatedir=/run --disable-maintainer-mode --disable-dependency-tracking
    dh_auto_build
-	make -j42
+	make -j20
 make[1]: Entering directory '/build/reproducible-path/evilwm-1.4.2'
 gcc -std=c99 -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/evilwm-1.4.2=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Os -Wall -W -Wstrict-prototypes -Wpointer-arith -Wcast-align -Wshadow -Waggregate-return -Wnested-externs -Winline -Wwrite-strings -Wundef -Wsign-compare -Wmissing-prototypes -Wredundant-decls -Wdate-time -D_FORTIFY_SOURCE=2 -DHAVE_MATH_H -DINFOBANNER -DRANDR -DSHAPE -DSOLIDDRAG -DNDEBUG   -DVERSION=\"1.4.2\" -D_XOPEN_SOURCE=700 -DHAVE_CONFIG_H -c bind.c
 gcc -std=c99 -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/evilwm-1.4.2=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Os -Wall -W -Wstrict-prototypes -Wpointer-arith -Wcast-align -Wshadow -Waggregate-return -Wnested-externs -Winline -Wwrite-strings -Wundef -Wsign-compare -Wmissing-prototypes -Wredundant-decls -Wdate-time -D_FORTIFY_SOURCE=2 -DHAVE_MATH_H -DINFOBANNER -DRANDR -DSHAPE -DSOLIDDRAG -DNDEBUG   -DVERSION=\"1.4.2\" -D_XOPEN_SOURCE=700 -DHAVE_CONFIG_H -c client.c
@@ -452,7 +488,7 @@
    dh_prep
    dh_installdirs
    dh_auto_install --destdir=debian/evilwm/
-	make -j42 install DESTDIR=/build/reproducible-path/evilwm-1.4.2/debian/evilwm AM_UPDATE_INFO_DIR=no
+	make -j20 install DESTDIR=/build/reproducible-path/evilwm-1.4.2/debian/evilwm AM_UPDATE_INFO_DIR=no
 make[1]: Entering directory '/build/reproducible-path/evilwm-1.4.2'
 install -d -m 0755 /build/reproducible-path/evilwm-1.4.2/debian/evilwm/usr/bin
 install -m 0755 evilwm /build/reproducible-path/evilwm-1.4.2/debian/evilwm/usr/bin/
@@ -488,12 +524,14 @@
 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/783880/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/783880/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/1764139 and its subdirectories
-I: Current time: Sat Jun  7 07:52:01 -12 2025
-I: pbuilder-time-stamp: 1749325921
+I: removing directory /srv/workspace/pbuilder/783880 and its subdirectories
+I: Current time: Mon May  6 03:31:26 +14 2024
+I: pbuilder-time-stamp: 1714915886