Diff of the two buildlogs:

--
--- b1/build.log	2025-01-15 00:11:44.854435449 +0000
+++ b2/build.log	2025-01-15 00:13:57.152437581 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Tue Jan 14 12:09:31 -12 2025
-I: pbuilder-time-stamp: 1736899771
+I: Current time: Tue Feb 17 20:34:48 +14 2026
+I: pbuilder-time-stamp: 1771310088
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/unstable-reproducible-base.tgz]
 I: copying local configuration
@@ -25,52 +25,84 @@
 dpkg-source: info: applying fix_boost_linkage.patch
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/210130/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/294492/tmp/hooks/D01_modify_environment starting
+debug: Running on codethink01-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 17 06:34 /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/294492/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/294492/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='unstable'
-  HOME='/root'
-  HOST_ARCH='arm64'
+  DIRSTACK=()
+  DISTRIBUTION=unstable
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=aarch64
+  HOST_ARCH=arm64
   IFS=' 	
   '
-  INVOCATION_ID='07786a6c309e4fd3b68a41b8afcb20b5'
-  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='210130'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=785d7d865a2649ab91c08e1d75645ff6
+  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=294492
   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.TYdUEZNE/pbuilderrc_SIy4 --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.TYdUEZNE/b1 --logfile b1/build.log python-freecontact_1.1-9.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.TYdUEZNE/pbuilderrc_Q5KH --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.TYdUEZNE/b2 --logfile b2/build.log python-freecontact_1.1-9.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 codethink02-arm64 6.1.0-30-cloud-arm64 #1 SMP Debian 6.1.124-1 (2025-01-12) aarch64 GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-30-cloud-arm64 #1 SMP Debian 6.1.124-1 (2025-01-12) aarch64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 Nov 22 14:40 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/210130/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Nov 22  2024 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/294492/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -210,7 +242,7 @@
 Get: 92 http://deb.debian.org/debian unstable/main arm64 python3-all arm64 3.13.1-2 [1056 B]
 Get: 93 http://deb.debian.org/debian unstable/main arm64 python3.12-dev arm64 3.12.8-5 [506 kB]
 Get: 94 http://deb.debian.org/debian unstable/main arm64 python3-all-dev arm64 3.13.1-2 [1076 B]
-Fetched 63.2 MB in 0s (144 MB/s)
+Fetched 63.2 MB in 0s (218 MB/s)
 Preconfiguring packages ...
 Selecting previously unselected package libpython3.13-minimal:arm64.
 (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 ... 19964 files and directories currently installed.)
@@ -529,8 +561,8 @@
 Setting up tzdata (2024b-6) ...
 
 Current default time zone: 'Etc/UTC'
-Local time is now:      Wed Jan 15 00:09:52 UTC 2025.
-Universal Time is now:  Wed Jan 15 00:09:52 UTC 2025.
+Local time is now:      Tue Feb 17 06:35:09 UTC 2026.
+Universal Time is now:  Tue Feb 17 06:35:09 UTC 2026.
 Run 'dpkg-reconfigure tzdata' if you wish to change it.
 
 Setting up autotools-dev (20220109.1) ...
@@ -617,7 +649,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/python-freecontact-1.1/ && 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  > ../python-freecontact_1.1-9_source.changes
+I: user script /srv/workspace/pbuilder/294492/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for unstable
+I: user script /srv/workspace/pbuilder/294492/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/python-freecontact-1.1/ && 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  > ../python-freecontact_1.1-9_source.changes
 dpkg-buildpackage: info: source package python-freecontact
 dpkg-buildpackage: info: source version 1.1-9
 dpkg-buildpackage: info: source distribution unstable
@@ -676,26 +712,26 @@
 ..will use 1 OMP threads
 total weight (variation) of alignment = 620.777515304633
 
-seq weight loop for 1000 seqs took 0.012681 secs
+seq weight loop for 1000 seqs took 0.006476 secs
 will use 1 OMP threads
 calculated column aa frequencies, gap cols = 4
-calculated pair frequency table in 0.1528 secs
+calculated pair frequency table in 0.091935 secs
 collected apc_mean[MI] = 0.174031486973761
 aa freq sum (cell) = 0.999997158936351, pairfreq sum (cell) = 0.999994420985606
 formed covariance matrix (122/126,4)
-LU factorization took 3.50966 secs, inverted matrix (incl LUf) in 12.2946 secs
+LU factorization took 3.30494 secs, inverted matrix (incl LUf) in 11.2629 secs
 density of inverse covariance matrix = 1 (cksum 346842.2)
 went back to gapped (126) wwi matrix
 collected apc_mean[l1norm] = 117.987034975652
 collected apc_mean[fro] = 3.35437753102448
-all done in 12.5523 secs
+all done in 11.4489 secs
 will use 1 OMP threads
 total weight (variation) of alignment = 561.595172234625
 
-seq weight loop for 1000 seqs took 0.004661 secs
+seq weight loop for 1000 seqs took 0.004823 secs
 will use 1 OMP threads
 calculated column aa frequencies, gap cols = 4
-calculated pair frequency table in 0.095521 secs
+calculated pair frequency table in 0.091344 secs
 collected apc_mean[MI] = 0.165528914074767
 aa freq sum (cell) = 0.999993945475299, pairfreq sum (cell) = 0.999988196197513
 formed covariance matrix (126/126,4)
@@ -713,50 +749,50 @@
 cov matrix Cholesky... not positive definite, dmean dev: 0.0143657
 cov matrix Cholesky... not positive definite, dmean dev: 0.0129291
 cov matrix Cholesky...
-shrank covariance matrix in 6.48527 secs
+shrank covariance matrix in 5.52881 secs
 will try rho 0.00178064, exact solution
  iteration =   1 iteration =   2 iteration =   3 iteration =   4 iteration =   5will use 1 OMP threads
 total weight (variation) of alignment = 620.777515304633
 will use 1 OMP threads
 calculated column aa frequencies, gap cols = 4
-calculated pair frequency table in 0.106567 secs
+calculated pair frequency table in 0.092855 secs
 collected apc_mean[MI] = 0.174031486973761
 aa freq sum (cell) = 0.999997158936351, pairfreq sum (cell) = 0.999994420985606
 formed covariance matrix (122/126,4)
-LU factorization took 3.501 secs, inverted matrix (incl LUf) in 12.9036 secs
+LU factorization took 3.30446 secs, inverted matrix (incl LUf) in 11.1927 secs
 density of inverse covariance matrix = 1 (cksum 346842.2)
 went back to gapped (126) wwi matrix
 collected apc_mean[l1norm] = 117.987034975652
 collected apc_mean[fro] = 3.35437753102448
 .
 ----------------------------------------------------------------------
-Ran 3 tests in 34.427s
+Ran 3 tests in 30.531s
 
 OK
 I: pybuild base:311: python3.13 /build/reproducible-path/python-freecontact-1.1/test/test01.py
 ..will use 1 OMP threads
 total weight (variation) of alignment = 620.777515304633
 
-seq weight loop for 1000 seqs took 0.005258 secs
+seq weight loop for 1000 seqs took 0.004547 secs
 will use 1 OMP threads
 calculated column aa frequencies, gap cols = 4
-calculated pair frequency table in 0.114384 secs
+calculated pair frequency table in 0.08417 secs
 collected apc_mean[MI] = 0.174031486973761
 aa freq sum (cell) = 0.999997158936351, pairfreq sum (cell) = 0.999994420985606
 formed covariance matrix (122/126,4)
-LU factorization took 3.93514 secs, inverted matrix (incl LUf) in 12.8232 secs
+LU factorization took 3.30635 secs, inverted matrix (incl LUf) in 11.5291 secs
 density of inverse covariance matrix = 1 (cksum 346842.2)
 went back to gapped (126) wwi matrix
 collected apc_mean[l1norm] = 117.987034975652
 collected apc_mean[fro] = 3.35437753102448
-all done in 13.0364 secs
+all done in 11.7058 secs
 will use 1 OMP threads
 total weight (variation) of alignment = 561.595172234625
 
-seq weight loop for 1000 seqs took 0.004961 secs
+seq weight loop for 1000 seqs took 0.005257 secs
 will use 1 OMP threads
 calculated column aa frequencies, gap cols = 4
-calculated pair frequency table in 0.105918 secs
+calculated pair frequency table in 0.096034 secs
 collected apc_mean[MI] = 0.165528914074767
 aa freq sum (cell) = 0.999993945475299, pairfreq sum (cell) = 0.999988196197513
 formed covariance matrix (126/126,4)
@@ -774,27 +810,27 @@
 cov matrix Cholesky... not positive definite, dmean dev: 0.0143657
 cov matrix Cholesky... not positive definite, dmean dev: 0.0129291
 cov matrix Cholesky...
-shrank covariance matrix in 6.55219 secs
+shrank covariance matrix in 6.63607 secs
 will try rho 0.00178064, exact solution
  iteration =   1 iteration =   2 iteration =   3 iteration =   4 iteration =   5will use 1 OMP threads
 total weight (variation) of alignment = 620.777515304633
 will use 1 OMP threads
 calculated column aa frequencies, gap cols = 4
-calculated pair frequency table in 0.098554 secs
+calculated pair frequency table in 0.095831 secs
 collected apc_mean[MI] = 0.174031486973761
 aa freq sum (cell) = 0.999997158936351, pairfreq sum (cell) = 0.999994420985606
 formed covariance matrix (122/126,4)
-LU factorization took 3.45836 secs, inverted matrix (incl LUf) in 12.4767 secs
+LU factorization took 3.32302 secs, inverted matrix (incl LUf) in 11.8375 secs
 density of inverse covariance matrix = 1 (cksum 346842.2)
 went back to gapped (126) wwi matrix
 collected apc_mean[l1norm] = 117.987034975652
 collected apc_mean[fro] = 3.35437753102448
 .
 ----------------------------------------------------------------------
-Ran 3 tests in 34.655s
+Ran 3 tests in 32.602s
 
 OK
-	rm -fr -- /tmp/dh-xdg-rundir-0SOoMcLE
+	rm -fr -- /tmp/dh-xdg-rundir-cSQnSR9P
 make[1]: Leaving directory '/build/reproducible-path/python-freecontact-1.1'
    create-stamp debian/debhelper-build-stamp
    dh_testroot -O--buildsystem=pybuild -O--builddirectory=/build/reproducible-path/python-freecontact-1.1/builddir
@@ -852,7 +888,7 @@
 D: dh_python3 dh_python3:205: processing package python3-freecontact...
 D: dh_python3 fs:50: moving files from debian/python3-freecontact/usr/lib/python3.12/dist-packages to debian/python3-freecontact/usr/lib/python3/dist-packages/
 D: dh_python3 fs:50: moving files from debian/python3-freecontact/usr/lib/python3.13/dist-packages to debian/python3-freecontact/usr/lib/python3/dist-packages/
-D: dh_python3 fs:338: package python3-freecontact details = {'requires.txt': set(), 'egg-info': {'debian/python3-freecontact/usr/lib/python3/dist-packages/python_freecontact-1.1.egg-info/PKG-INFO'}, 'dist-info': set(), 'nsp.txt': set(), 'shebangs': set(), 'public_vers': {Version('3')}, 'private_dirs': {}, 'compile': False, 'ext_vers': {Version('3.12'), Version('3.13')}, 'ext_no_version': set()}
+D: dh_python3 fs:338: package python3-freecontact details = {'requires.txt': set(), 'egg-info': {'debian/python3-freecontact/usr/lib/python3/dist-packages/python_freecontact-1.1.egg-info/PKG-INFO'}, 'dist-info': set(), 'nsp.txt': set(), 'shebangs': set(), 'public_vers': {Version('3')}, 'private_dirs': {}, 'compile': False, 'ext_vers': {Version('3.13'), Version('3.12')}, 'ext_no_version': set()}
 D: dh_python3 depends:103: generating dependencies for package python3-freecontact
 D: dh_python3 depends:253: D={'python3 (<< 3.14)', 'python3 (>= 3.12~)'}; R=[]; S=[]; E=[], B=[]; RT=[]
    dh_installsystemduser -O--buildsystem=pybuild -O--builddirectory=/build/reproducible-path/python-freecontact-1.1/builddir
@@ -924,8 +960,8 @@
    dh_builddeb -O--buildsystem=pybuild -O--builddirectory=/build/reproducible-path/python-freecontact-1.1/builddir
 	dpkg-deb --root-owner-group --build debian/python3-freecontact ..
 	dpkg-deb --root-owner-group --build debian/.debhelper/python3-freecontact/dbgsym-root ..
-dpkg-deb: building package 'python3-freecontact' in '../python3-freecontact_1.1-9_arm64.deb'.
 dpkg-deb: building package 'python3-freecontact-dbgsym' in '../python3-freecontact-dbgsym_1.1-9_arm64.deb'.
+dpkg-deb: building package 'python3-freecontact' in '../python3-freecontact_1.1-9_arm64.deb'.
  dpkg-genbuildinfo --build=binary -O../python-freecontact_1.1-9_arm64.buildinfo
  dpkg-genchanges --build=binary -O../python-freecontact_1.1-9_arm64.changes
 dpkg-genchanges: info: binary-only upload (no source code included)
@@ -933,12 +969,14 @@
 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/294492/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/294492/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/210130 and its subdirectories
-I: Current time: Tue Jan 14 12:11:43 -12 2025
-I: pbuilder-time-stamp: 1736899903
+I: removing directory /srv/workspace/pbuilder/294492 and its subdirectories
+I: Current time: Tue Feb 17 20:36:56 +14 2026
+I: pbuilder-time-stamp: 1771310216