diff -Nru dpkg-1.21.1ubuntu2.2/debian/changelog dpkg-1.21.1ubuntu2.3/debian/changelog
--- dpkg-1.21.1ubuntu2.2/debian/changelog	2023-04-01 13:43:42.000000000 +0000
+++ dpkg-1.21.1ubuntu2.3/debian/changelog	2024-02-23 14:53:39.000000000 +0000
@@ -1,3 +1,10 @@
+dpkg (1.21.1ubuntu2.3) jammy; urgency=medium
+
+  [ Luca Boccassi ]
+  * Fix dpkg-buildpackage ignoring DEB_BUILD_PROFILES (LP: #2054741)
+
+ -- Gianfranco Costamagna <locutusofborg@debian.org>  Fri, 23 Feb 2024 15:53:39 +0100
+
 dpkg (1.21.1ubuntu2.2) jammy; urgency=medium
 
   * Cherry-pick 940f86c37f9f from dpkg.git (LP: #1960582)
diff -Nru dpkg-1.21.1ubuntu2.2/scripts/Dpkg/BuildProfiles.pm dpkg-1.21.1ubuntu2.3/scripts/Dpkg/BuildProfiles.pm
--- dpkg-1.21.1ubuntu2.2/scripts/Dpkg/BuildProfiles.pm	2022-01-06 07:44:08.000000000 +0000
+++ dpkg-1.21.1ubuntu2.3/scripts/Dpkg/BuildProfiles.pm	2024-02-23 14:53:06.000000000 +0000
@@ -80,6 +80,11 @@
     my (@profiles) = @_;
 
     $cache_profiles = 1;
+    # This is called from dpkg-buildpackage.pl unconditionally. If no profile
+    # was passed from the command line, check the environment variable.
+    if (!@profiles && Dpkg::Build::Env::has('DEB_BUILD_PROFILES')) {
+        @profiles = split ' ', Dpkg::Build::Env::get('DEB_BUILD_PROFILES');
+    }
     @build_profiles = @profiles;
     run_vendor_hook('update-buildprofiles', \@build_profiles);
     Dpkg::Build::Env::set('DEB_BUILD_PROFILES', join ' ', @build_profiles);
diff -Nru dpkg-1.21.1ubuntu2.2/scripts/t/Dpkg_BuildProfiles.t dpkg-1.21.1ubuntu2.3/scripts/t/Dpkg_BuildProfiles.t
--- dpkg-1.21.1ubuntu2.2/scripts/t/Dpkg_BuildProfiles.t	2022-01-06 07:44:08.000000000 +0000
+++ dpkg-1.21.1ubuntu2.3/scripts/t/Dpkg_BuildProfiles.t	2024-02-23 14:53:06.000000000 +0000
@@ -16,7 +16,7 @@
 use strict;
 use warnings;
 
-use Test::More tests => 10;
+use Test::More tests => 11;
 
 BEGIN {
     use_ok('Dpkg::BuildProfiles', qw(parse_build_profiles
@@ -72,5 +72,16 @@
 is_deeply([ get_build_profiles() ], [ qw(nocheck stage1) ],
     'get active build profiles explicitly set');
 
+{
+    local $ENV{DEB_BUILD_PROFILES} = 'cross nodoc profile.name';
+
+    # dpkg-buildpackage.pl calls set_build_profiles with an empty array by
+    # default (unless --build-profiles is used), ensure the env var is still
+    # parsed
+    set_build_profiles(qw());
+    is_deeply([ get_build_profiles() ], [ qw(noudeb cross nodoc profile.name) ],
+        'get active build profiles from environment');
+}
+
 
 1;
File /tmp/tmp7rxurq8a/LbCbow6UBk/dpkg-1.21.1ubuntu2.2/tests/t-unpack-fifo/pkg-fifo/test-fifo is a fifo while file /tmp/tmp7rxurq8a/43xT7t0rtD/dpkg-1.21.1ubuntu2.3/tests/t-unpack-fifo/pkg-fifo/test-fifo is a fifo
File /tmp/tmp7rxurq8a/LbCbow6UBk/dpkg-1.21.1ubuntu2.2/tests/t-unpack-hardlink/pkg-hardlink/test-fifo-link0 is a fifo while file /tmp/tmp7rxurq8a/43xT7t0rtD/dpkg-1.21.1ubuntu2.3/tests/t-unpack-hardlink/pkg-hardlink/test-fifo-link0 is a fifo
File /tmp/tmp7rxurq8a/LbCbow6UBk/dpkg-1.21.1ubuntu2.2/tests/t-unpack-hardlink/pkg-hardlink/test-fifo-link1 is a fifo while file /tmp/tmp7rxurq8a/43xT7t0rtD/dpkg-1.21.1ubuntu2.3/tests/t-unpack-hardlink/pkg-hardlink/test-fifo-link1 is a fifo