Diff of the two buildlogs:

--
--- b1/build.log	2025-03-18 20:52:18.554102980 +0000
+++ b2/build.log	2025-03-18 20:53:27.498998178 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Tue Mar 18 08:50:06 -12 2025
-I: pbuilder-time-stamp: 1742331006
+I: Current time: Tue Apr 21 17:15:20 +14 2026
+I: pbuilder-time-stamp: 1776741320
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/unstable-reproducible-base.tgz]
 I: copying local configuration
@@ -27,52 +27,84 @@
 dpkg-source: info: applying 0004-CFLAGS-CFLAGS-debug-file-with-no-debug-symbols.patch
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/1412142/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/3938505/tmp/hooks/D01_modify_environment starting
+debug: Running on ionos15-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 Apr 21 03:15 /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/3938505/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/3938505/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=20 '
-  DISTRIBUTION='unstable'
-  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]="37" [3]="1" [4]="release" [5]="x86_64-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=amd64
+  DEBIAN_FRONTEND=noninteractive
+  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=42 '
+  DIRSTACK=()
+  DISTRIBUTION=unstable
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=x86_64
+  HOST_ARCH=amd64
   IFS=' 	
   '
-  INVOCATION_ID='548a49d4ee0545a7a7dd8993c2913440'
-  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='1412142'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=e4b5911f12a7434ca9b2b7e0c2f8e6b3
+  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=3938505
   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.v7O01OBZ/pbuilderrc_lwX9 --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.v7O01OBZ/b1 --logfile b1/build.log vtgrab_0.1.8-5.dsc'
-  SUDO_GID='111'
-  SUDO_UID='106'
-  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.v7O01OBZ/pbuilderrc_sS0n --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.v7O01OBZ/b2 --logfile b2/build.log vtgrab_0.1.8-5.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://213.165.73.152:3128
 I: uname -a
-  Linux ionos11-amd64 6.1.0-32-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.129-1 (2025-03-06) x86_64 GNU/Linux
+  Linux i-capture-the-hostname 6.12.12+bpo-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.12.12-1~bpo12+1 (2025-02-23) 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/1412142/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Mar  4  2025 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/3938505/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -142,7 +174,7 @@
 Get: 30 http://deb.debian.org/debian unstable/main amd64 debhelper all 13.24.1 [920 kB]
 Get: 31 http://deb.debian.org/debian unstable/main amd64 libncurses6 amd64 6.5+20250216-2 [105 kB]
 Get: 32 http://deb.debian.org/debian unstable/main amd64 libncurses-dev amd64 6.5+20250216-2 [353 kB]
-Fetched 21.3 MB in 1s (21.4 MB/s)
+Fetched 21.3 MB in 1s (34.4 MB/s)
 Preconfiguring packages ...
 Selecting previously unselected package sensible-utils.
 (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 ... 19784 files and directories currently installed.)
@@ -285,7 +317,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/vtgrab-0.1.8/ && 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  > ../vtgrab_0.1.8-5_source.changes
+I: user script /srv/workspace/pbuilder/3938505/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for unstable
+I: user script /srv/workspace/pbuilder/3938505/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/vtgrab-0.1.8/ && 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  > ../vtgrab_0.1.8-5_source.changes
 dpkg-buildpackage: info: source package vtgrab
 dpkg-buildpackage: info: source version 0.1.8-5
 dpkg-buildpackage: info: source distribution unstable
@@ -395,7 +431,7 @@
 config.status: creating config.h
 config.status: executing depfiles commands
    dh_auto_build
-	make -j20
+	make -j42
 make[1]: Entering directory '/build/reproducible-path/vtgrab-0.1.8'
 make  all-am
 make[2]: Entering directory '/build/reproducible-path/vtgrab-0.1.8'
@@ -404,6 +440,30 @@
 gcc -DHAVE_CONFIG_H -I.   -Wdate-time -D_FORTIFY_SOURCE=2  -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/vtgrab-0.1.8=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -D_GNU_SOURCE -Wall -W -O2 -c -o xfree86.o xfree86.c
 gcc -DHAVE_CONFIG_H -I.   -Wdate-time -D_FORTIFY_SOURCE=2  -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/vtgrab-0.1.8=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -D_GNU_SOURCE -Wall -W -O2 -c -o nrvc.o nrvc.c
 gcc -DHAVE_CONFIG_H -I.   -Wdate-time -D_FORTIFY_SOURCE=2  -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/vtgrab-0.1.8=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -D_GNU_SOURCE -Wall -W -O2 -c -o simple_panel.o simple_panel.c
+rvc.c:113:12: warning: conflicting types for built-in function 'log'; expected 'double(double)' [-Wbuiltin-declaration-mismatch]
+  113 | static int log (const char *reason, ...)
+      |            ^~~
+rvc.c:38:1: note: 'log' is declared in header '<math.h>'
+   37 | #include "rvc.h"
+  +++ |+#include <math.h>
+   38 | 
+rvcd.c:97:12: warning: conflicting types for built-in function 'log'; expected 'double(double)' [-Wbuiltin-declaration-mismatch]
+   97 | static int log (const char *reason, ...)
+      |            ^~~
+rvcd.c:43:1: note: 'log' is declared in header '<math.h>'
+   42 | #include "xfree86.h"
+  +++ |+#include <math.h>
+   43 | 
+rvc.c: In function 'client':
+rvc.c:238:23: warning: variable 'their_major' set but not used [-Wunused-but-set-variable]
+  238 |         unsigned long their_major;
+      |                       ^~~~~~~~~~~
+rvc.c:328:9: warning: ignoring return value of 'fread' declared with attribute 'warn_unused_result' [-Wunused-result]
+  328 |         fread (&ci.rows, 1, 1, vcsa);
+      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
+rvc.c:329:9: warning: ignoring return value of 'fread' declared with attribute 'warn_unused_result' [-Wunused-result]
+  329 |         fread (&ci.cols, 1, 1, vcsa);
+      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
 xfree86.c: In function 'grab_cookie':
 xfree86.c:124:17: warning: ignoring return value of 'dup' declared with attribute 'warn_unused_result' [-Wunused-result]
   124 |                 dup (fildes[0]); /* stdin */
@@ -436,30 +496,6 @@
 xfree86.c:224:9: warning: ignoring return value of 'getline' declared with attribute 'warn_unused_result' [-Wunused-result]
   224 |         getline (&line, &linelen, f);
       |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
-rvc.c:113:12: warning: conflicting types for built-in function 'log'; expected 'double(double)' [-Wbuiltin-declaration-mismatch]
-  113 | static int log (const char *reason, ...)
-      |            ^~~
-rvc.c:38:1: note: 'log' is declared in header '<math.h>'
-   37 | #include "rvc.h"
-  +++ |+#include <math.h>
-   38 | 
-rvc.c: In function 'client':
-rvc.c:238:23: warning: variable 'their_major' set but not used [-Wunused-but-set-variable]
-  238 |         unsigned long their_major;
-      |                       ^~~~~~~~~~~
-rvc.c:328:9: warning: ignoring return value of 'fread' declared with attribute 'warn_unused_result' [-Wunused-result]
-  328 |         fread (&ci.rows, 1, 1, vcsa);
-      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
-rvc.c:329:9: warning: ignoring return value of 'fread' declared with attribute 'warn_unused_result' [-Wunused-result]
-  329 |         fread (&ci.cols, 1, 1, vcsa);
-      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
-rvcd.c:97:12: warning: conflicting types for built-in function 'log'; expected 'double(double)' [-Wbuiltin-declaration-mismatch]
-   97 | static int log (const char *reason, ...)
-      |            ^~~
-rvcd.c:43:1: note: 'log' is declared in header '<math.h>'
-   42 | #include "xfree86.h"
-  +++ |+#include <math.h>
-   43 | 
 nrvc.c:72:12: warning: conflicting types for built-in function 'log'; expected 'double(double)' [-Wbuiltin-declaration-mismatch]
    72 | static int log (char *fmt __attribute__ ((unused)), ...)
       |            ^~~
@@ -495,17 +531,17 @@
 make[2]: Leaving directory '/build/reproducible-path/vtgrab-0.1.8'
 make[1]: Leaving directory '/build/reproducible-path/vtgrab-0.1.8'
    dh_auto_test
-	make -j20 check "TESTSUITEFLAGS=-j20 --verbose" VERBOSE=1
+	make -j42 check "TESTSUITEFLAGS=-j42 --verbose" VERBOSE=1
 make[1]: Entering directory '/build/reproducible-path/vtgrab-0.1.8'
 make[1]: Leaving directory '/build/reproducible-path/vtgrab-0.1.8'
    create-stamp debian/debhelper-build-stamp
    dh_prep
    dh_auto_install --destdir=debian/vtgrab/
-	make -j20 install DESTDIR=/build/reproducible-path/vtgrab-0.1.8/debian/vtgrab AM_UPDATE_INFO_DIR=no
+	make -j42 install DESTDIR=/build/reproducible-path/vtgrab-0.1.8/debian/vtgrab AM_UPDATE_INFO_DIR=no
 make[1]: Entering directory '/build/reproducible-path/vtgrab-0.1.8'
 make[2]: Entering directory '/build/reproducible-path/vtgrab-0.1.8'
- /usr/bin/mkdir -p '/build/reproducible-path/vtgrab-0.1.8/debian/vtgrab/usr/bin'
 make[2]: Nothing to be done for 'install-data-am'.
+ /usr/bin/mkdir -p '/build/reproducible-path/vtgrab-0.1.8/debian/vtgrab/usr/bin'
   /usr/bin/install -c rvc rvcd twiglet '/build/reproducible-path/vtgrab-0.1.8/debian/vtgrab/usr/bin'
 make[2]: Leaving directory '/build/reproducible-path/vtgrab-0.1.8'
 make[1]: Leaving directory '/build/reproducible-path/vtgrab-0.1.8'
@@ -525,8 +561,8 @@
    dh_gencontrol
    dh_md5sums
    dh_builddeb
-dpkg-deb: building package 'vtgrab-dbgsym' in '../vtgrab-dbgsym_0.1.8-5_amd64.deb'.
 dpkg-deb: building package 'vtgrab' in '../vtgrab_0.1.8-5_amd64.deb'.
+dpkg-deb: building package 'vtgrab-dbgsym' in '../vtgrab-dbgsym_0.1.8-5_amd64.deb'.
  dpkg-genbuildinfo --build=binary -O../vtgrab_0.1.8-5_amd64.buildinfo
  dpkg-genchanges --build=binary -O../vtgrab_0.1.8-5_amd64.changes
 dpkg-genchanges: info: binary-only upload (no source code included)
@@ -534,12 +570,14 @@
 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/3938505/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/3938505/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/1412142 and its subdirectories
-I: Current time: Tue Mar 18 08:52:17 -12 2025
-I: pbuilder-time-stamp: 1742331137
+I: removing directory /srv/workspace/pbuilder/3938505 and its subdirectories
+I: Current time: Tue Apr 21 17:16:26 +14 2026
+I: pbuilder-time-stamp: 1776741386