Diff of the two buildlogs:

--
--- b1/build.log	2025-02-27 14:23:22.452598504 +0000
+++ b2/build.log	2025-02-27 14:24:08.882515183 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Wed Apr  1 08:45:46 -12 2026
-I: pbuilder-time-stamp: 1775076346
+I: Current time: Fri Feb 28 04:23:25 +14 2025
+I: pbuilder-time-stamp: 1740666205
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/trixie-reproducible-base.tgz]
 I: copying local configuration
@@ -30,52 +30,84 @@
 dpkg-source: info: applying Fix-type-declarations.patch
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/1821573/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/2334016/tmp/hooks/D01_modify_environment starting
+debug: Running on codethink04-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
+'/bin/sh' -> '/bin/bash'
+lrwxrwxrwx 1 root root 9 Feb 27 14:23 /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/2334016/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/2334016/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='arm64'
-  DEBIAN_FRONTEND='noninteractive'
+  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]="aarch64-unknown-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=arm64
+  DEBIAN_FRONTEND=noninteractive
   DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=12 '
-  DISTRIBUTION='trixie'
-  HOME='/root'
-  HOST_ARCH='arm64'
+  DIRSTACK=()
+  DISTRIBUTION=trixie
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=aarch64
+  HOST_ARCH=arm64
   IFS=' 	
   '
-  INVOCATION_ID='9bbe9203b881497bb9415df4ac74e7db'
-  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='1821573'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=094a6b2b00e94155baebf148e0859cc8
+  LANG=C
+  LANGUAGE=nl_BE:nl
+  LC_ALL=C
+  MACHTYPE=aarch64-unknown-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=2334016
   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.IS0U7wNd/pbuilderrc_CP2y --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.IS0U7wNd/b1 --logfile b1/build.log tcl-fitstcl_2.5-3.dsc'
-  SUDO_GID='109'
-  SUDO_UID='104'
-  SUDO_USER='jenkins'
-  TERM='unknown'
-  TZ='/usr/share/zoneinfo/Etc/GMT+12'
-  USER='root'
-  _='/usr/bin/systemd-run'
-  http_proxy='http://192.168.101.4:3128'
+  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.IS0U7wNd/pbuilderrc_wOQL --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.IS0U7wNd/b2 --logfile b2/build.log tcl-fitstcl_2.5-3.dsc'
+  SUDO_GID=109
+  SUDO_UID=104
+  SUDO_USER=jenkins
+  TERM=unknown
+  TZ=/usr/share/zoneinfo/Etc/GMT-14
+  UID=0
+  USER=root
+  _='I: set'
+  http_proxy=http://192.168.101.4:3128
 I: uname -a
-  Linux codethink03-arm64 6.1.0-31-cloud-arm64 #1 SMP Debian 6.1.128-1 (2025-02-07) aarch64 GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-31-cloud-arm64 #1 SMP Debian 6.1.128-1 (2025-02-07) aarch64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 Nov 22  2024 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/1821573/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Nov 22 14:40 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/2334016/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -204,7 +236,7 @@
 Get: 85 http://deb.debian.org/debian trixie/main arm64 tcl8.6-dev arm64 8.6.16+dfsg-1 [1012 kB]
 Get: 86 http://deb.debian.org/debian trixie/main arm64 tcl-dev arm64 8.6.14 [6572 B]
 Get: 87 http://deb.debian.org/debian trixie/main arm64 wcslib-dev arm64 8.4+ds-1 [396 kB]
-Fetched 35.0 MB in 0s (152 MB/s)
+Fetched 35.0 MB in 0s (125 MB/s)
 Preconfiguring packages ...
 Selecting previously unselected package tzdata.
 (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 ... 19916 files and directories currently installed.)
@@ -496,8 +528,8 @@
 Setting up tzdata (2025a-2) ...
 
 Current default time zone: 'Etc/UTC'
-Local time is now:      Wed Apr  1 20:46:04 UTC 2026.
-Universal Time is now:  Wed Apr  1 20:46:04 UTC 2026.
+Local time is now:      Thu Feb 27 14:23:45 UTC 2025.
+Universal Time is now:  Thu Feb 27 14:23:45 UTC 2025.
 Run 'dpkg-reconfigure tzdata' if you wish to change it.
 
 Setting up autotools-dev (20220109.1) ...
@@ -573,7 +605,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/tcl-fitstcl-2.5/ && 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  > ../tcl-fitstcl_2.5-3_source.changes
+I: user script /srv/workspace/pbuilder/2334016/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for trixie
+I: user script /srv/workspace/pbuilder/2334016/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/tcl-fitstcl-2.5/ && 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  > ../tcl-fitstcl_2.5-3_source.changes
 dpkg-buildpackage: info: source package tcl-fitstcl
 dpkg-buildpackage: info: source version 2.5-3
 dpkg-buildpackage: info: source distribution unstable
@@ -707,21 +743,6 @@
 fvTcl.c:60:4: warning: ignoring return value of 'fgets' declared with attribute 'warn_unused_result' [-Wunused-result]
    60 |    fgets(simple, 7, fitsPtr);
       |    ^~~~~~~~~~~~~~~~~~~~~~~~~
-fitsUtils.c: In function 'dumpFitsErrStack':
-fitsUtils.c:50:8: warning: assignment discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
-   50 |    res = Tcl_GetStringResult( interp );
-      |        ^
-fitsUtils.c: In function 'fitsTransColList':
-fitsUtils.c:587:26: warning: passing argument 1 of 'strcpy' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
-  587 |          strcpy( colArray[i], tmpstr );
-      |                  ~~~~~~~~^~~
-In file included from /usr/include/features.h:510,
-                 from /usr/include/aarch64-linux-gnu/sys/types.h:25,
-                 from fitsTclInt.h:21,
-                 from fitsUtils.c:21:
-/usr/include/aarch64-linux-gnu/bits/string_fortified.h:77:16: note: expected 'char *' but argument is of type 'const char *'
-   77 | __NTH (strcpy (__fortify_clang_overload_arg (char *, __restrict, __dest),
-      |                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
 fitsIO.c: In function 'fitsSortTable':
 fitsIO.c:7147:25: warning: passing argument 1 of 'sprintf' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
  7147 |          sprintf(rowlist[i],"%ld",columndata[i].rowindex);
@@ -739,6 +760,21 @@
 /usr/include/aarch64-linux-gnu/bits/stdio2.h:28:1: note: expected 'char *' but argument is of type 'const char *'
    28 | __NTH (sprintf (char *__restrict __s, const char *__restrict __fmt, ...))
       | ^~~~~
+fitsUtils.c: In function 'dumpFitsErrStack':
+fitsUtils.c:50:8: warning: assignment discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
+   50 |    res = Tcl_GetStringResult( interp );
+      |        ^
+fitsUtils.c: In function 'fitsTransColList':
+fitsUtils.c:587:26: warning: passing argument 1 of 'strcpy' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
+  587 |          strcpy( colArray[i], tmpstr );
+      |                  ~~~~~~~~^~~
+In file included from /usr/include/features.h:510,
+                 from /usr/include/aarch64-linux-gnu/sys/types.h:25,
+                 from fitsTclInt.h:21,
+                 from fitsUtils.c:21:
+/usr/include/aarch64-linux-gnu/bits/string_fortified.h:77:16: note: expected 'char *' but argument is of type 'const char *'
+   77 | __NTH (strcpy (__fortify_clang_overload_arg (char *, __restrict, __dest),
+      |                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
 aarch64-linux-gnu-gcc -shared -Wl,-z,relro fitsInit.o fitsUtils.o fitsTcl.o fitsCmds.o fitsIO.o fvTcl.o tclShared.o -ldl   -o libfitstcl.so
 echo "pkg_mkIndex  . libfitstcl.so" | tclsh
 make[1]: Leaving directory '/build/reproducible-path/tcl-fitstcl-2.5'
@@ -753,7 +789,7 @@
 Running tests that match:  *
 Skipping test files that match:  l.*.test
 Only running test files that match:  *.test
-Tests began at Wed Apr 01 08:46:17 -1200 2026
+Tests began at Fri Feb 28 04:24:02 +1400 2025
 image.test
 ++++ fits-info PASSED
 ++++ info-chdu PASSED
@@ -781,7 +817,7 @@
 ++++ get-keyword PASSED
 ++++ get-table PASSED
 
-Tests ended at Wed Apr 01 08:46:17 -1200 2026
+Tests ended at Fri Feb 28 04:24:03 +1400 2025
 all.tcl:	Total	23	Passed	23	Skipped	0	Failed	0
 Sourced 3 Test Files.
 make[1]: Leaving directory '/build/reproducible-path/tcl-fitstcl-2.5'
@@ -827,12 +863,14 @@
 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/2334016/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/2334016/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/1821573 and its subdirectories
-I: Current time: Wed Apr  1 08:46:20 -12 2026
-I: pbuilder-time-stamp: 1775076380
+I: removing directory /srv/workspace/pbuilder/2334016 and its subdirectories
+I: Current time: Fri Feb 28 04:24:07 +14 2025
+I: pbuilder-time-stamp: 1740666247