Diff of the two buildlogs:

--
--- b1/build.log	2025-03-11 23:40:01.634355263 +0000
+++ b2/build.log	2025-03-11 23:41:45.113687684 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Mon Apr 13 18:01:48 -12 2026
-I: pbuilder-time-stamp: 1776146508
+I: Current time: Wed Mar 12 13:40:04 +14 2025
+I: pbuilder-time-stamp: 1741736404
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/unstable-reproducible-base.tgz]
 I: copying local configuration
@@ -26,54 +26,86 @@
 dpkg-source: info: applying Remove-NDX-and-JNIAST-references.patch
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/125154/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/50322/tmp/hooks/D01_modify_environment starting
+debug: Running on ionos2-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 Mar 11 23:40 /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/50322/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/50322/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=22 '
-  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=10 '
+  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='463f0ed8ce0c4148ac3b6d99219ff588'
-  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='125154'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=783475a7dc624fffacecbb6f68d709fd
+  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=50322
   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.dyS9a9MU/pbuilderrc_pgE5 --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.dyS9a9MU/b1 --logfile b1/build.log starjava-fits_0.1+2025.01.23-1.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://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.dyS9a9MU/pbuilderrc_JhsE --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.dyS9a9MU/b2 --logfile b2/build.log starjava-fits_0.1+2025.01.23-1.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://46.16.76.132:3128
 I: uname -a
-  Linux ionos6-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  2025 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/125154/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Mar  4 11:20 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/50322/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -407,7 +439,7 @@
 Get: 274 http://deb.debian.org/debian unstable/main i386 starlink-connect-java all 0.1+2024.08.01-1 [51.5 kB]
 Get: 275 http://deb.debian.org/debian unstable/main i386 starlink-pal-java all 1.0.1+2024.07.24-1 [72.4 kB]
 Get: 276 http://deb.debian.org/debian unstable/main i386 starlink-table-java all 4.3.2-1 [620 kB]
-Fetched 277 MB in 3s (79.5 MB/s)
+Fetched 277 MB in 3s (82.2 MB/s)
 Preconfiguring packages ...
 Selecting previously unselected package libsystemd-shared: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.)
@@ -1328,8 +1360,8 @@
 Setting up tzdata (2025a-2) ...
 
 Current default time zone: 'Etc/UTC'
-Local time is now:      Tue Apr 14 06:02:27 UTC 2026.
-Universal Time is now:  Tue Apr 14 06:02:27 UTC 2026.
+Local time is now:      Tue Mar 11 23:40:57 UTC 2025.
+Universal Time is now:  Tue Mar 11 23:40:57 UTC 2025.
 Run 'dpkg-reconfigure tzdata' if you wish to change it.
 
 Setting up libxcb-present0:i386 (1.17.0-2+b1) ...
@@ -1763,7 +1795,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/starjava-fits-0.1+2025.01.23/ && 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  > ../starjava-fits_0.1+2025.01.23-1_source.changes
+I: user script /srv/workspace/pbuilder/50322/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for unstable
+I: user script /srv/workspace/pbuilder/50322/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/starjava-fits-0.1+2025.01.23/ && 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  > ../starjava-fits_0.1+2025.01.23-1_source.changes
 dpkg-buildpackage: info: source package starjava-fits
 dpkg-buildpackage: info: source version 0.1+2025.01.23-1
 dpkg-buildpackage: info: source distribution unstable
@@ -1810,7 +1846,7 @@
       [zip] Building zip: /build/reproducible-path/starjava-fits-0.1+2025.01.23/lib/starlink-fits/starlink-fits_src.zip
 
 BUILD SUCCESSFUL
-Total time: 2 seconds
+Total time: 4 seconds
 ant javadocs
 Buildfile: /build/reproducible-path/starjava-fits-0.1+2025.01.23/build.xml
 
@@ -1873,7 +1909,7 @@
   [javadoc] 15 warnings
 
 BUILD SUCCESSFUL
-Total time: 3 seconds
+Total time: 4 seconds
 make[1]: Leaving directory '/build/reproducible-path/starjava-fits-0.1+2025.01.23'
    debian/rules override_dh_auto_test
 make[1]: Entering directory '/build/reproducible-path/starjava-fits-0.1+2025.01.23'
@@ -1895,53 +1931,53 @@
 
 run-tests:
     [junit] Testsuite: uk.ac.starlink.fits.BasicInputTest
-    [junit] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.101 sec
+    [junit] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.166 sec
     [junit] 
-    [junit] Testcase: testInput took 0.096 sec
+    [junit] Testcase: testInput took 0.158 sec
     [junit] Testsuite: uk.ac.starlink.fits.CardTest
-    [junit] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.018 sec
+    [junit] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.041 sec
     [junit] 
-    [junit] Testcase: testCardFactory took 0.012 sec
+    [junit] Testcase: testCardFactory took 0.028 sec
     [junit] Testsuite: uk.ac.starlink.fits.ColumnReaderTest
-    [junit] Tests run: 4, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.291 sec
+    [junit] Tests run: 4, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.382 sec
     [junit] 
-    [junit] Testcase: testWriteRead took 0.239 sec
-    [junit] Testcase: testRead took 0.032 sec
-    [junit] Testcase: testTformX took 0.007 sec
-    [junit] Testcase: testTformX1 took 0.008 sec
+    [junit] Testcase: testWriteRead took 0.296 sec
+    [junit] Testcase: testRead took 0.052 sec
+    [junit] Testcase: testTformX took 0.013 sec
+    [junit] Testcase: testTformX1 took 0.014 sec
     [junit] Testsuite: uk.ac.starlink.fits.DemoTableTest
-    [junit] Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.196 sec
+    [junit] Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.321 sec
     [junit] 
-    [junit] Testcase: testDemoAscii took 0.142 sec
-    [junit] Testcase: testDemoBinary took 0.048 sec
+    [junit] Testcase: testDemoAscii took 0.219 sec
+    [junit] Testcase: testDemoBinary took 0.091 sec
     [junit] Testsuite: uk.ac.starlink.fits.HeaderTest
-    [junit] Tests run: 5, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.113 sec
+    [junit] Tests run: 5, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.204 sec
     [junit] 
-    [junit] Testcase: testCardFactories took 0.086 sec
+    [junit] Testcase: testCardFactories took 0.162 sec
     [junit] Testcase: testTxt took 0 sec
-    [junit] Testcase: testContinue took 0.005 sec
-    [junit] Testcase: testHierarch took 0.002 sec
-    [junit] Testcase: testArrayMeta took 0.013 sec
+    [junit] Testcase: testContinue took 0.01 sec
+    [junit] Testcase: testHierarch took 0.003 sec
+    [junit] Testcase: testArrayMeta took 0.019 sec
     [junit] Testsuite: uk.ac.starlink.fits.MultiTest
-    [junit] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.247 sec
+    [junit] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.476 sec
     [junit] 
-    [junit] Testcase: testMultiWrite took 0.242 sec
+    [junit] Testcase: testMultiWrite took 0.466 sec
     [junit] Testsuite: uk.ac.starlink.fits.SerializerTest
-    [junit] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.137 sec
+    [junit] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.208 sec
     [junit] 
-    [junit] Testcase: testBadRowCount took 0.131 sec
+    [junit] Testcase: testBadRowCount took 0.2 sec
     [junit] Testsuite: uk.ac.starlink.fits.WideTest
-    [junit] Tests run: 4, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.567 sec
+    [junit] Tests run: 4, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.829 sec
     [junit] 
-    [junit] Testcase: testName took 0.005 sec
-    [junit] Testcase: testBase26 took 0.016 sec
-    [junit] Testcase: testReadWrite took 0.475 sec
-    [junit] Testcase: testUnwide took 0.063 sec
+    [junit] Testcase: testBase26 took 0.032 sec
+    [junit] Testcase: testReadWrite took 0.761 sec
+    [junit] Testcase: testUnwide took 0.028 sec
+    [junit] Testcase: testName took 0 sec
 
 test:
 
 BUILD SUCCESSFUL
-Total time: 5 seconds
+Total time: 7 seconds
 make[1]: Leaving directory '/build/reproducible-path/starjava-fits-0.1+2025.01.23'
    create-stamp debian/debhelper-build-stamp
    dh_prep
@@ -1972,12 +2008,14 @@
 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/50322/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/50322/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/125154 and its subdirectories
-I: Current time: Mon Apr 13 18:02:57 -12 2026
-I: pbuilder-time-stamp: 1776146577
+I: removing directory /srv/workspace/pbuilder/50322 and its subdirectories
+I: Current time: Wed Mar 12 13:41:44 +14 2025
+I: pbuilder-time-stamp: 1741736504