Diff of the two buildlogs:

--
--- b1/build.log	2025-03-05 18:15:18.603110068 +0000
+++ b2/build.log	2025-03-05 18:16:57.890623752 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Wed Mar  5 06:12:29 -12 2025
-I: pbuilder-time-stamp: 1741198349
+I: Current time: Wed Apr  8 14:38:20 +14 2026
+I: pbuilder-time-stamp: 1775608700
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/unstable-reproducible-base.tgz]
 I: copying local configuration
@@ -24,54 +24,86 @@
 dpkg-source: info: unpacking dvipng_1.18-1.debian.tar.xz
 I: using fakeroot in build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/43023/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/44457/tmp/hooks/D01_modify_environment starting
+debug: Running on ionos6-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 Apr  8 00:38 /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/44457/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/44457/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=11 '
-  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=21 '
+  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='f77f0dd166eb43cfae0e8102a77af822'
-  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='43023'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=c6b3b997b20a486b9ca1da7f7138c37c
+  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=44457
   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.SvROU5Zo/pbuilderrc_o3it --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.SvROU5Zo/b1 --logfile b1/build.log dvipng_1.18-1.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://46.16.76.132:3128'
+  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.SvROU5Zo/pbuilderrc_I65h --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.SvROU5Zo/b2 --logfile b2/build.log dvipng_1.18-1.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://213.165.73.152:3128
 I: uname -a
-  Linux ionos12-i386 6.1.0-31-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.128-1 (2025-02-07) x86_64 GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-31-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.128-1 (2025-02-07) x86_64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 Mar  4 11:20 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/43023/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Mar  4  2025 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/44457/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -325,7 +357,7 @@
 Get: 204 http://deb.debian.org/debian unstable/main i386 xdg-utils all 1.2.1-2 [75.8 kB]
 Get: 205 http://deb.debian.org/debian unstable/main i386 texlive-base all 2024.20250114-1 [22.8 MB]
 Get: 206 http://deb.debian.org/debian unstable/main i386 texlive-latex-base all 2024.20250114-1 [1282 kB]
-Fetched 118 MB in 1s (78.7 MB/s)
+Fetched 118 MB in 2s (76.3 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 ... 19769 files and directories currently installed.)
@@ -997,8 +1029,8 @@
 Setting up tzdata (2025a-2) ...
 
 Current default time zone: 'Etc/UTC'
-Local time is now:      Wed Mar  5 18:13:12 UTC 2025.
-Universal Time is now:  Wed Mar  5 18:13:12 UTC 2025.
+Local time is now:      Wed Apr  8 00:38:49 UTC 2026.
+Universal Time is now:  Wed Apr  8 00:38:49 UTC 2026.
 Run 'dpkg-reconfigure tzdata' if you wish to change it.
 
 Setting up libsysprof-capture-4-dev:i386 (48~beta-2) ...
@@ -1206,7 +1238,11 @@
 fakeroot is already the newest version (1.37-1).
 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
 I: Building the package
-I: Running cd /build/reproducible-path/dvipng-1.18/ && 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  > ../dvipng_1.18-1_source.changes
+I: user script /srv/workspace/pbuilder/44457/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for unstable
+I: user script /srv/workspace/pbuilder/44457/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/dvipng-1.18/ && 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  > ../dvipng_1.18-1_source.changes
 dpkg-buildpackage: info: source package dvipng
 dpkg-buildpackage: info: source version 1.18-1
 dpkg-buildpackage: info: source distribution unstable
@@ -1333,7 +1369,7 @@
 config.status: creating Makefile
 config.status: creating config.h
    dh_auto_build
-	make -j11
+	make -j21
 make[1]: Entering directory '/build/reproducible-path/dvipng-1.18'
 gcc -I/usr/include/freetype2 -I/usr/include/libpng16  -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/dvipng-1.18=. -fstack-protector-strong -Wformat -Werror=format-security -Wall -Wdate-time -D_FORTIFY_SOURCE=2 -I.  -c -o dvipng.o dvipng.c
 gcc -I/usr/include/freetype2 -I/usr/include/libpng16  -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/dvipng-1.18=. -fstack-protector-strong -Wformat -Werror=format-security -Wall -Wdate-time -D_FORTIFY_SOURCE=2 -I.  -c -o color.o color.c
@@ -1346,6 +1382,12 @@
 gcc -I/usr/include/freetype2 -I/usr/include/libpng16  -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/dvipng-1.18=. -fstack-protector-strong -Wformat -Werror=format-security -Wall -Wdate-time -D_FORTIFY_SOURCE=2 -I.  -c -o special.o special.c
 gcc -I/usr/include/freetype2 -I/usr/include/libpng16  -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/dvipng-1.18=. -fstack-protector-strong -Wformat -Werror=format-security -Wall -Wdate-time -D_FORTIFY_SOURCE=2 -I.  -c -o papersiz.o papersiz.c
 gcc -I/usr/include/freetype2 -I/usr/include/libpng16  -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/dvipng-1.18=. -fstack-protector-strong -Wformat -Werror=format-security -Wall -Wdate-time -D_FORTIFY_SOURCE=2 -I.  -c -o ppagelist.o ppagelist.c
+gcc -I/usr/include/freetype2 -I/usr/include/libpng16  -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/dvipng-1.18=. -fstack-protector-strong -Wformat -Werror=format-security -Wall -Wdate-time -D_FORTIFY_SOURCE=2 -I.  -c -o vf.o vf.c
+gcc -I/usr/include/freetype2 -I/usr/include/libpng16  -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/dvipng-1.18=. -fstack-protector-strong -Wformat -Werror=format-security -Wall -Wdate-time -D_FORTIFY_SOURCE=2 -I.  -c -o sfd.o sfd.c
+gcc -I/usr/include/freetype2 -I/usr/include/libpng16  -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/dvipng-1.18=. -fstack-protector-strong -Wformat -Werror=format-security -Wall -Wdate-time -D_FORTIFY_SOURCE=2 -I.  -c -o ft.o ft.c
+gcc -I/usr/include/freetype2 -I/usr/include/libpng16  -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/dvipng-1.18=. -fstack-protector-strong -Wformat -Werror=format-security -Wall -Wdate-time -D_FORTIFY_SOURCE=2 -I.  -c -o enc.o enc.c
+gcc -I/usr/include/freetype2 -I/usr/include/libpng16  -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/dvipng-1.18=. -fstack-protector-strong -Wformat -Werror=format-security -Wall -Wdate-time -D_FORTIFY_SOURCE=2 -I.  -c -o fontmap.o fontmap.c
+gcc -I/usr/include/freetype2 -I/usr/include/libpng16  -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/dvipng-1.18=. -fstack-protector-strong -Wformat -Werror=format-security -Wall -Wdate-time -D_FORTIFY_SOURCE=2 -I.  -c -o tfm.o tfm.c
 color.c: In function 'stringrgb':
 color.c:296:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   296 |     if (k)
@@ -1359,10 +1401,6 @@
 color.c:297:11: note: in expansion of macro 'NEXTFLOAT255'
   297 |       k = NEXTFLOAT255(color);
       |           ^~~~~~~~~~~~
-gcc -I/usr/include/freetype2 -I/usr/include/libpng16  -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/dvipng-1.18=. -fstack-protector-strong -Wformat -Werror=format-security -Wall -Wdate-time -D_FORTIFY_SOURCE=2 -I.  -c -o vf.o vf.c
-gcc -I/usr/include/freetype2 -I/usr/include/libpng16  -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/dvipng-1.18=. -fstack-protector-strong -Wformat -Werror=format-security -Wall -Wdate-time -D_FORTIFY_SOURCE=2 -I.  -c -o sfd.o sfd.c
-gcc -I/usr/include/freetype2 -I/usr/include/libpng16  -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/dvipng-1.18=. -fstack-protector-strong -Wformat -Werror=format-security -Wall -Wdate-time -D_FORTIFY_SOURCE=2 -I.  -c -o ft.o ft.c
-gcc -I/usr/include/freetype2 -I/usr/include/libpng16  -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/dvipng-1.18=. -fstack-protector-strong -Wformat -Werror=format-security -Wall -Wdate-time -D_FORTIFY_SOURCE=2 -I.  -c -o enc.o enc.c
 sfd.c: In function 'FindSubFont':
 sfd.c:147:3: warning: '__builtin_strncpy' specified bound depends on the length of the source argument [-Wstringop-truncation]
   147 |   strncpy(infix,sfdwant,strlen(sfdwant)-strlen(postfix));
@@ -1370,8 +1408,6 @@
 sfd.c:147:25: note: length computed here
   147 |   strncpy(infix,sfdwant,strlen(sfdwant)-strlen(postfix));
       |                         ^~~~~~~~~~~~~~~
-gcc -I/usr/include/freetype2 -I/usr/include/libpng16  -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/dvipng-1.18=. -fstack-protector-strong -Wformat -Werror=format-security -Wall -Wdate-time -D_FORTIFY_SOURCE=2 -I.  -c -o fontmap.o fontmap.c
-gcc -I/usr/include/freetype2 -I/usr/include/libpng16  -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/dvipng-1.18=. -fstack-protector-strong -Wformat -Werror=format-security -Wall -Wdate-time -D_FORTIFY_SOURCE=2 -I.  -c -o tfm.o tfm.c
 gcc -Wl,-z,relro -Wl,-z,now dvipng.o color.o draw.o dvi.o font.o misc.o pk.o set.o special.o papersiz.o ppagelist.o vf.o sfd.o ft.o enc.o fontmap.o tfm.o -o dvipng -lfreetype  -lkpathsea -lgd -lpng -lz -lm 
 ./dvipng > dvipng.tmp
 ( test -r dvipng.help && diff dvipng.tmp dvipng.help ) \
@@ -1427,7 +1463,7 @@
 Transcript written on dvipng.log.
 make[1]: Leaving directory '/build/reproducible-path/dvipng-1.18'
    dh_auto_test
-	make -j11 test "TESTSUITEFLAGS=-j11 --verbose" VERBOSE=1
+	make -j21 test "TESTSUITEFLAGS=-j21 --verbose" VERBOSE=1
 make[1]: Entering directory '/build/reproducible-path/dvipng-1.18'
 latex ./test_dvipng.tex
 This is pdfTeX, Version 3.141592653-2.6-1.40.26 (TeX Live 2025/dev/Debian) (preloaded format=latex)
@@ -1466,7 +1502,7 @@
    create-stamp debian/debhelper-build-stamp
    dh_prep
    dh_auto_install --destdir=debian/dvipng/
-	make -j11 install DESTDIR=/build/reproducible-path/dvipng-1.18/debian/dvipng AM_UPDATE_INFO_DIR=no
+	make -j21 install DESTDIR=/build/reproducible-path/dvipng-1.18/debian/dvipng AM_UPDATE_INFO_DIR=no
 make[1]: Entering directory '/build/reproducible-path/dvipng-1.18'
 ./mkinstalldirs /build/reproducible-path/dvipng-1.18/debian/dvipng/usr/bin
 ./mkinstalldirs /build/reproducible-path/dvipng-1.18/debian/dvipng/usr/share/info
@@ -1515,12 +1551,14 @@
 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/44457/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/44457/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/43023 and its subdirectories
-I: Current time: Wed Mar  5 06:15:17 -12 2025
-I: pbuilder-time-stamp: 1741198517
+I: removing directory /srv/workspace/pbuilder/44457 and its subdirectories
+I: Current time: Wed Apr  8 14:39:57 +14 2026
+I: pbuilder-time-stamp: 1775608797