Diff of the two buildlogs:

--
--- b1/build.log	2020-04-06 00:17:03.618037693 +0000
+++ b2/build.log	2020-04-06 00:17:38.037372680 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Sun Apr  5 12:07:32 -12 2020
-I: pbuilder-time-stamp: 1586131652
+I: Current time: Sun May  9 20:40:04 +14 2021
+I: pbuilder-time-stamp: 1620542404
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/buster-reproducible-base.tgz]
 I: copying local configuration
@@ -18,7 +18,7 @@
 I: Extracting source
 gpgv: unknown type of key resource 'trustedkeys.kbx'
 gpgv: keyblock resource '/root/.gnupg/trustedkeys.kbx': General error
-gpgv: Signature made Sun Jul 23 21:21:12 2017 -12
+gpgv: Signature made Mon Jul 24 23:21:12 2017 +14
 gpgv:                using RSA key 8451F9178172E7E2DC73F79551F84A8FECCA7E09
 gpgv: Can't check signature: No public key
 dpkg-source: warning: failed to verify signature on ./golang-github-gin-contrib-sse_0.0~git20170109.0.22d885f-1.dsc
@@ -29,6 +29,18 @@
 dpkg-source: info: applying 0001-Fix-broken-test.patch
 I: using fakeroot in build.
 I: Installing the build-deps
+I: user script /srv/workspace/pbuilder/41636/tmp/hooks/D01_modify_environment starting
+disorder-fs debug: Running on profitbricks-build6-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
+Removing 'diversion of /bin/sh to /bin/sh.distrib by dash'
+Adding 'diversion of /bin/sh to /bin/sh.distrib by bash'
+Removing 'diversion of /usr/share/man/man1/sh.1.gz to /usr/share/man/man1/sh.distrib.1.gz by dash'
+Adding 'diversion of /usr/share/man/man1/sh.1.gz to /usr/share/man/man1/sh.distrib.1.gz by 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/41636/tmp/hooks/D01_modify_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -113,7 +125,7 @@
 Get: 41 http://deb.debian.org/debian buster/main i386 golang-github-pmezard-go-difflib-dev all 1.0.0-2 [12.0 kB]
 Get: 42 http://deb.debian.org/debian buster/main i386 golang-github-stretchr-objx-dev all 0.1.1+git20180825.ef50b0d-1 [23.4 kB]
 Get: 43 http://deb.debian.org/debian buster/main i386 golang-github-stretchr-testify-dev all 1.3.0+ds-1 [49.8 kB]
-Fetched 74.4 MB in 31s (2380 kB/s)
+Fetched 74.4 MB in 1s (76.2 MB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 Selecting previously unselected package libbsd0:i386.
 (Reading database ... 
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(Reading database ... 19231 files and directories currently installed.)
@@ -308,7 +320,7 @@
 fakeroot is already the newest version (1.23-1).
 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
 I: Building the package
-I: Running cd /build/golang-github-gin-contrib-sse-0.0~git20170109.0.22d885f/ && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games" HOME="/nonexistent/first-build" dpkg-buildpackage -us -uc -b
+I: Running cd /build/golang-github-gin-contrib-sse-0.0~git20170109.0.22d885f/ && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/i/capture/the/path" HOME="/nonexistent/second-build" dpkg-buildpackage -us -uc -b
 dpkg-buildpackage: info: source package golang-github-gin-contrib-sse
 dpkg-buildpackage: info: source version 0.0~git20170109.0.22d885f-1
 dpkg-buildpackage: info: source distribution unstable
@@ -326,64 +338,64 @@
    dh_autoreconf -O--buildsystem=golang
    dh_auto_configure -O--buildsystem=golang
    dh_auto_build -O--buildsystem=golang
-	cd obj-i686-linux-gnu && go install -gcflags=all=\"-trimpath=/build/golang-github-gin-contrib-sse-0.0\~git20170109.0.22d885f/obj-i686-linux-gnu/src\" -asmflags=all=\"-trimpath=/build/golang-github-gin-contrib-sse-0.0\~git20170109.0.22d885f/obj-i686-linux-gnu/src\" -v -p 10 github.com/gin-contrib/sse
+	cd obj-i686-linux-gnu && go install -gcflags=all=\"-trimpath=/build/golang-github-gin-contrib-sse-0.0\~git20170109.0.22d885f/obj-i686-linux-gnu/src\" -asmflags=all=\"-trimpath=/build/golang-github-gin-contrib-sse-0.0\~git20170109.0.22d885f/obj-i686-linux-gnu/src\" -v -p 18 github.com/gin-contrib/sse
 errors
-unicode
-encoding
-unicode/utf8
 internal/race
+unicode/utf8
+unicode
 math/bits
+unicode/utf16
+crypto/subtle
+crypto/internal/subtle
 sync/atomic
+internal/nettrace
+vendor/golang_org/x/crypto/cryptobyte/asn1
+container/list
+encoding
 internal/cpu
+vendor/golang_org/x/net/dns/dnsmessage
 runtime/internal/atomic
+runtime/cgo
 runtime/internal/sys
-unicode/utf16
 math
-container/list
-crypto/internal/subtle
-crypto/subtle
 internal/testlog
-vendor/golang_org/x/crypto/cryptobyte/asn1
-vendor/golang_org/x/net/dns/dnsmessage
-internal/nettrace
-runtime/cgo
 internal/bytealg
 runtime
 strconv
 crypto/rc4
 sync
-math/rand
 io
-syscall
 internal/singleflight
+math/rand
 reflect
+syscall
 hash
 crypto/internal/randutil
 bytes
 strings
 crypto/cipher
-crypto
 crypto/hmac
+crypto
 hash/crc32
-crypto/sha512
-crypto/md5
 crypto/sha1
+crypto/sha512
 crypto/sha256
+crypto/md5
+crypto/aes
 vendor/golang_org/x/text/transform
 bufio
-crypto/aes
 path
 internal/syscall/unix
 time
 internal/poll
-sort
 encoding/binary
+sort
 os
 encoding/base64
 crypto/des
+vendor/golang_org/x/crypto/poly1305
 vendor/golang_org/x/crypto/curve25519
 vendor/golang_org/x/crypto/internal/chacha20
-vendor/golang_org/x/crypto/poly1305
 vendor/golang_org/x/crypto/chacha20poly1305
 encoding/pem
 path/filepath
@@ -391,31 +403,31 @@
 io/ioutil
 context
 encoding/hex
+log
 net/url
-mime
 vendor/golang_org/x/net/http2/hpack
-log
-encoding/json
 compress/flate
+net/http/internal
+mime/quotedprintable
+mime
+encoding/json
 math/big
 vendor/golang_org/x/text/unicode/norm
-mime/quotedprintable
-net
 vendor/golang_org/x/text/unicode/bidi
-net/http/internal
-compress/gzip
+net
 vendor/golang_org/x/text/secure/bidirule
+compress/gzip
 vendor/golang_org/x/net/idna
+crypto/dsa
 crypto/rand
 encoding/asn1
-crypto/dsa
 crypto/elliptic
 crypto/rsa
-vendor/golang_org/x/crypto/cryptobyte
-crypto/x509/pkix
 crypto/ecdsa
-vendor/golang_org/x/net/http/httpproxy
+crypto/x509/pkix
+vendor/golang_org/x/crypto/cryptobyte
 net/textproto
+vendor/golang_org/x/net/http/httpproxy
 crypto/x509
 vendor/golang_org/x/net/http/httpguts
 mime/multipart
@@ -424,7 +436,7 @@
 net/http
 github.com/gin-contrib/sse
    dh_auto_test -O--buildsystem=golang
-	cd obj-i686-linux-gnu && go test -vet=off -v -p 10 github.com/gin-contrib/sse
+	cd obj-i686-linux-gnu && go test -vet=off -v -p 18 github.com/gin-contrib/sse
 === RUN   TestDecodeSingle1
 --- PASS: TestDecodeSingle1 (0.00s)
 === RUN   TestDecodeSingle2
@@ -460,7 +472,7 @@
 === RUN   TestRenderSSE
 --- PASS: TestRenderSSE (0.00s)
 PASS
-ok  	github.com/gin-contrib/sse	0.015s
+ok  	github.com/gin-contrib/sse	0.005s
    create-stamp debian/debhelper-build-stamp
  fakeroot debian/rules binary
 dh binary --buildsystem=golang --with=golang
@@ -491,12 +503,14 @@
  dpkg-source --after-build .
 dpkg-buildpackage: info: binary-only upload (no source included)
 I: copying local configuration
+I: user script /srv/workspace/pbuilder/41636/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/41636/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/23829 and its subdirectories
-I: Current time: Sun Apr  5 12:17:03 -12 2020
-I: pbuilder-time-stamp: 1586132223
+I: removing directory /srv/workspace/pbuilder/41636 and its subdirectories
+I: Current time: Sun May  9 20:40:37 +14 2021
+I: pbuilder-time-stamp: 1620542437