Adding upstream version 13.15.3.upstream/13.15.3

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

12 files changed, 1388 insertions, 0 deletions

diff --git a/lib/Debian/Debhelper/Buildsystem/ant.pm b/lib/Debian/Debhelper/Buildsystem/ant.pm
new file mode 100644
index 0000000..49aaf1e
--- /dev/null
+++ b/lib/Debian/Debhelper/Buildsystem/ant.pm
@@ -0,0 +1,52 @@
+# A debhelper build system class for handling Ant based projects.
+#
+# Copyright: © 2009 Joey Hess
+# License: GPL-2+
+
+package Debian::Debhelper::Buildsystem::ant;
+
+use strict;
+use warnings;
+use parent qw(Debian::Debhelper::Buildsystem);
+
+sub DESCRIPTION {
+	"Ant (build.xml)"
+}
+
+sub check_auto_buildable {
+	my $this=shift;
+	return (-e $this->get_sourcepath("build.xml")) ? 1 : 0;
+}
+
+sub new {
+	my $class=shift;
+	my $this=$class->SUPER::new(@_);
+	$this->enforce_in_source_building();
+	return $this;
+}
+
+sub build {
+	my $this=shift;
+	my $d_ant_prop = $this->get_sourcepath('debian/ant.properties');
+	my @args;
+	if ( -f $d_ant_prop ) {
+		push(@args, '-propertyfile', $d_ant_prop);
+	}
+
+	# Set the username to improve the reproducibility
+	push(@args, "-Duser.name", "debian");
+
+	$this->doit_in_sourcedir("ant", @args, @_);
+}
+
+sub clean {
+	my $this=shift;
+	my $d_ant_prop = $this->get_sourcepath('debian/ant.properties');
+	my @args;
+	if ( -f $d_ant_prop ) {
+		push(@args, '-propertyfile', $d_ant_prop);
+	}
+	$this->doit_in_sourcedir("ant", @args, "clean", @_);
+}
+
+1
diff --git a/lib/Debian/Debhelper/Buildsystem/autoconf.pm b/lib/Debian/Debhelper/Buildsystem/autoconf.pm
new file mode 100644
index 0000000..8752ea1
--- /dev/null
+++ b/lib/Debian/Debhelper/Buildsystem/autoconf.pm
@@ -0,0 +1,98 @@
+# A debhelper build system class for handling Autoconf based projects
+#
+# Copyright: © 2008 Joey Hess
+#            © 2008-2009 Modestas Vainius
+# License: GPL-2+
+
+package Debian::Debhelper::Buildsystem::autoconf;
+
+use strict;
+use warnings;
+use Debian::Debhelper::Dh_Lib qw(%dh dpkg_architecture_value get_buildoption sourcepackage compat);
+use parent qw(Debian::Debhelper::Buildsystem::makefile);
+
+sub DESCRIPTION {
+	"GNU Autoconf (configure)"
+}
+
+sub check_auto_buildable {
+	my $this=shift;
+	my ($step)=@_;
+
+	return 0 unless -f $this->get_sourcepath("configure") &&
+		-x _;
+
+	# Handle configure explicitly; inherit the rest
+	return 1 if $step eq "configure";
+	return $this->SUPER::check_auto_buildable(@_);
+}
+
+sub configure {
+	my $this=shift;
+
+	# Standard set of options for configure.
+	my @opts;
+	push @opts, "--build=" . dpkg_architecture_value("DEB_BUILD_GNU_TYPE");
+	push @opts, "--prefix=/usr";
+	push @opts, "--includedir=\${prefix}/include";
+	push @opts, "--mandir=\${prefix}/share/man";
+	push @opts, "--infodir=\${prefix}/share/info";
+	push @opts, "--sysconfdir=/etc";
+	push @opts, "--localstatedir=/var";
+	# We pass --disable/enable-* options that might be unknown, so we
+	# should not emit warnings.
+	push @opts, "--disable-option-checking";
+	if ($dh{QUIET}) {
+		push @opts, "--enable-silent-rules";
+	} else {
+		push @opts, "--disable-silent-rules";
+	}
+	my $multiarch=dpkg_architecture_value("DEB_HOST_MULTIARCH");
+	if (! compat(8)) {
+		if (defined $multiarch) {
+			push @opts, "--libdir=\${prefix}/lib/$multiarch";
+			push(@opts, "--libexecdir=\${prefix}/lib/$multiarch") if compat(11);
+		}
+		else {
+			push(@opts, "--libexecdir=\${prefix}/lib") if compat(11);
+		}
+	}
+	else {
+		push @opts, "--libexecdir=\${prefix}/lib/" . sourcepackage();
+	}
+	push @opts, "--runstatedir=/run" if not compat(10);
+	push @opts, "--disable-maintainer-mode";
+	push @opts, "--disable-dependency-tracking";
+	# Provide --host only if different from --build, as recommended in
+	# autotools-dev README.Debian: When provided (even if equal)
+	# autoconf 2.52+ switches to cross-compiling mode.
+	if (dpkg_architecture_value("DEB_BUILD_GNU_TYPE")
+	    ne dpkg_architecture_value("DEB_HOST_GNU_TYPE")) {
+		push @opts, "--host=" . dpkg_architecture_value("DEB_HOST_GNU_TYPE");
+	}
+
+	$this->mkdir_builddir();
+	eval {
+		$this->doit_in_builddir($this->get_source_rel2builddir("configure"), @opts, @_);
+	};
+	if ($@) {
+		if (-e $this->get_buildpath("config.log")) {
+			$this->doit_in_builddir('tail', '-v', '-n', '+0', 'config.log');
+		}
+		die $@;
+	}
+}
+
+sub test {
+	my $this=shift;
+
+	my $parallel = $this->get_parallel();
+	my @autotest;
+	push @autotest, "-j$parallel";
+	push @autotest, "--verbose" if not get_buildoption("terse");
+	$this->make_first_existing_target(['test', 'check'],
+		"TESTSUITEFLAGS=@autotest",
+		"VERBOSE=1", @_);
+}
+
+1
diff --git a/lib/Debian/Debhelper/Buildsystem/cmake.pm b/lib/Debian/Debhelper/Buildsystem/cmake.pm
new file mode 100644
index 0000000..cafc743
--- /dev/null
+++ b/lib/Debian/Debhelper/Buildsystem/cmake.pm
@@ -0,0 +1,217 @@
+# A debhelper build system class for handling CMake based projects.
+# It prefers out of source tree building.
+#
+# Copyright: © 2008-2009 Modestas Vainius
+# License: GPL-2+
+
+package Debian::Debhelper::Buildsystem::cmake;
+
+use strict;
+use warnings;
+use Debian::Debhelper::Dh_Lib qw(%dh compat dpkg_architecture_value error is_cross_compiling get_buildoption print_and_doit);
+use parent qw(Debian::Debhelper::Buildsystem);
+
+my @STANDARD_CMAKE_FLAGS = qw(
+  -DCMAKE_INSTALL_PREFIX=/usr
+  -DCMAKE_BUILD_TYPE=None
+  -DCMAKE_INSTALL_SYSCONFDIR=/etc
+  -DCMAKE_INSTALL_LOCALSTATEDIR=/var
+  -DCMAKE_EXPORT_NO_PACKAGE_REGISTRY=ON
+  -DCMAKE_FIND_USE_PACKAGE_REGISTRY=OFF
+  -DCMAKE_FIND_PACKAGE_NO_PACKAGE_REGISTRY=ON
+  -DFETCHCONTENT_FULLY_DISCONNECTED=ON
+);
+
+my %DEB_HOST2CMAKE_SYSTEM = (
+	'linux'    => 'Linux',
+	'kfreebsd' => 'kFreeBSD',
+	'hurd'     => 'GNU',
+);
+
+my %GNU_CPU2SYSTEM_PROCESSOR = (
+	'arm'         => 'armv7l',
+	'mips64el'    => 'mips64',
+	'powerpc64le' => 'ppc64le',
+);
+
+my %TARGET_BUILD_SYSTEM2CMAKE_GENERATOR = (
+	'makefile' => 'Unix Makefiles',
+	'ninja'    => 'Ninja',
+);
+
+sub DESCRIPTION {
+	"CMake (CMakeLists.txt)"
+}
+
+sub IS_GENERATOR_BUILD_SYSTEM {
+	return 1;
+}
+
+sub SUPPORTED_TARGET_BUILD_SYSTEMS {
+	return qw(makefile ninja);
+}
+
+sub check_auto_buildable {
+	my $this=shift;
+	my ($step)=@_;
+	if (-e $this->get_sourcepath("CMakeLists.txt")) {
+		my $ret = ($step eq "configure" && 1) ||
+		          $this->get_targetbuildsystem->check_auto_buildable(@_);
+		if ($this->check_auto_buildable_clean_oos_buildir(@_)) {
+			# Assume that the package can be cleaned (i.e. the build directory can
+			# be removed) as long as it is built out-of-source tree and can be
+			# configured.
+			$ret++ if not $ret;
+		}
+		# Existence of CMakeCache.txt indicates cmake has already
+		# been used by a prior build step, so should be used
+		# instead of the parent makefile class.
+		$ret++ if ($ret && -e $this->get_buildpath("CMakeCache.txt"));
+		return $ret;
+	}
+	return 0;
+}
+
+sub new {
+	my $class=shift;
+	my $this=$class->SUPER::new(@_);
+	$this->prefer_out_of_source_building(@_);
+	return $this;
+}
+
+sub _get_cmake_env {
+	my $update_env = {};
+	$update_env->{DEB_PYTHON_INSTALL_LAYOUT} = 'deb' unless $ENV{DEB_PYTHON_INSTALL_LAYOUT};
+	return $update_env;
+}
+
+sub configure {
+	my $this=shift;
+	# Standard set of cmake flags
+	my @flags = @STANDARD_CMAKE_FLAGS;
+	my $backend = $this->get_targetbuildsystem->NAME;
+
+	push(@flags, '-DCMAKE_INSTALL_RUNSTATEDIR=/run') if not compat(10);
+	# Speed up installation phase a bit.
+	push(@flags, "-DCMAKE_SKIP_INSTALL_ALL_DEPENDENCY=ON") if not compat(12);
+	# Reproducibility #962474 / #1004939
+	push(@flags, '-DCMAKE_BUILD_RPATH_USE_ORIGIN=ON') if not compat(13);
+	if (exists($TARGET_BUILD_SYSTEM2CMAKE_GENERATOR{$backend})) {
+		my $generator = $TARGET_BUILD_SYSTEM2CMAKE_GENERATOR{$backend};
+		push(@flags, "-G${generator}");
+	}
+	if (not $dh{QUIET}) {
+		push(@flags, "-DCMAKE_VERBOSE_MAKEFILE=ON");
+	}
+
+	if ($ENV{CC}) {
+		push @flags, "-DCMAKE_C_COMPILER=" . $ENV{CC};
+	}
+	if ($ENV{CXX}) {
+		push @flags, "-DCMAKE_CXX_COMPILER=" . $ENV{CXX};
+	}
+	if (is_cross_compiling()) {
+		my $deb_host = dpkg_architecture_value("DEB_HOST_ARCH_OS");
+		if (my $cmake_system = $DEB_HOST2CMAKE_SYSTEM{$deb_host}) {
+			push(@flags, "-DCMAKE_SYSTEM_NAME=${cmake_system}");
+		} else {
+			error("Cannot cross-compile - CMAKE_SYSTEM_NAME not known for ${deb_host}");
+		}
+		my $gnu_cpu = dpkg_architecture_value("DEB_HOST_GNU_CPU");
+		if (exists($GNU_CPU2SYSTEM_PROCESSOR{$gnu_cpu})) {
+			push @flags, "-DCMAKE_SYSTEM_PROCESSOR=" . $GNU_CPU2SYSTEM_PROCESSOR{$gnu_cpu};
+		} else {
+			push @flags, "-DCMAKE_SYSTEM_PROCESSOR=${gnu_cpu}";
+		}
+		if (not $ENV{CC}) {
+			push @flags, "-DCMAKE_C_COMPILER=" . dpkg_architecture_value("DEB_HOST_GNU_TYPE") . "-gcc";
+		}
+		if (not $ENV{CXX}) {
+			push @flags, "-DCMAKE_CXX_COMPILER=" . dpkg_architecture_value("DEB_HOST_GNU_TYPE") . "-g++";
+		}
+		push(@flags, "-DPKG_CONFIG_EXECUTABLE=/usr/bin/" . dpkg_architecture_value("DEB_HOST_GNU_TYPE") . "-pkg-config");
+		push(@flags, "-DPKGCONFIG_EXECUTABLE=/usr/bin/" . dpkg_architecture_value("DEB_HOST_GNU_TYPE") . "-pkg-config");
+		push(@flags, "-DQMAKE_EXECUTABLE=/usr/bin/" . dpkg_architecture_value("DEB_HOST_GNU_TYPE") . "-qmake");
+	}
+	push(@flags, "-DCMAKE_INSTALL_LIBDIR=lib/" . dpkg_architecture_value("DEB_HOST_MULTIARCH"));
+
+	# CMake doesn't respect CPPFLAGS, see #653916.
+	if ($ENV{CPPFLAGS} && ! compat(8)) {
+		$ENV{CFLAGS}   .= ' ' . $ENV{CPPFLAGS};
+		$ENV{CXXFLAGS} .= ' ' . $ENV{CPPFLAGS};
+	}
+	$ENV{ASMFLAGS} = $ENV{ASFLAGS} if exists($ENV{ASFLAGS}) and not exists($ENV{ASMFLAGS}) and not compat(13);
+
+	if (get_buildoption("nocheck")) {
+		push(@flags, "-DBUILD_TESTING:BOOL=OFF");
+	}
+
+	$this->mkdir_builddir();
+	eval { 
+		my %options = (
+			update_env => _get_cmake_env(),
+		);
+		$this->doit_in_builddir(\%options, "cmake", @flags, @_, $this->get_source_rel2builddir());
+	};
+	if (my $err = $@) {
+		if (-e $this->get_buildpath("CMakeCache.txt")) {
+			$this->doit_in_builddir('tail', '-v', '-n', '+0', 'CMakeCache.txt');
+		}
+		if (-e $this->get_buildpath('CMakeFiles/CMakeOutput.log')) {
+			$this->doit_in_builddir('tail', '-v', '-n', '+0', 'CMakeFiles/CMakeOutput.log');
+		}
+		if (-e $this->get_buildpath('CMakeFiles/CMakeError.log')) {
+			$this->doit_in_builddir('tail', '-v', '-n', '+0', 'CMakeFiles/CMakeError.log');
+		}
+		die $err;
+	}
+}
+
+sub build {
+	my $this=shift;
+	my $target = $this->get_targetbuildsystem;
+	if ($target->NAME eq 'makefile') {
+		# Add VERBOSE=1 for #973029 when not asked to be quiet/terse.
+		push(@_, "VERBOSE=1") if not $dh{QUIET};
+	}
+	return $this->SUPER::build(@_);
+}
+
+sub test {
+	my $this=shift;
+	my $target = $this->get_targetbuildsystem;
+	$ENV{CTEST_OUTPUT_ON_FAILURE} = 1;
+	if ($target->NAME eq 'makefile') {
+		# Unlike make, CTest does not have "unlimited parallel" setting (-j implies
+		# -j1). So in order to simulate unlimited parallel, allow to fork a huge
+		# number of threads instead.
+		my $parallel = ($this->get_parallel() > 0) ? $this->get_parallel() : 999;
+		unshift(@_, "ARGS+=-j$parallel");
+		unshift(@_, "ARGS+=--verbose") if not get_buildoption("terse");
+	}
+	return $this->SUPER::test(@_);
+}
+
+sub install {
+	my $this = shift;
+	my $target = $this->get_targetbuildsystem;
+
+	if (compat(13)) {
+		$target->install(@_);
+	} else {
+		# In compat 14 `cmake --install` is preferred to `make install`,
+		# see https://bugs.debian.org/1020732
+		my $destdir = shift;
+		my %options = (
+			update_env => {
+				'LC_ALL'  => 'C.UTF-8',
+				'DESTDIR' => $destdir,
+				%{ _get_cmake_env() },
+			}
+		);
+		print_and_doit(\%options, 'cmake', '--install', $this->get_buildpath, @_);
+	}
+	return 1;
+}
+
+1
diff --git a/lib/Debian/Debhelper/Buildsystem/makefile.pm b/lib/Debian/Debhelper/Buildsystem/makefile.pm
new file mode 100644
index 0000000..856a6dd
--- /dev/null
+++ b/lib/Debian/Debhelper/Buildsystem/makefile.pm
@@ -0,0 +1,204 @@
+# A debhelper build system class for handling simple Makefile based projects.
+#
+# Copyright: © 2008 Joey Hess
+#            © 2008-2009 Modestas Vainius
+# License: GPL-2+
+
+package Debian::Debhelper::Buildsystem::makefile;
+
+use strict;
+use warnings;
+use Debian::Debhelper::Dh_Lib qw(dpkg_architecture_value escape_shell clean_jobserver_makeflags is_cross_compiling compat
+	should_use_root gain_root_cmd error);
+use parent qw(Debian::Debhelper::Buildsystem);
+
+my %DEB_DEFAULT_TOOLS = (
+	'CC'		=> 'gcc',
+	'CXX'		=> 'g++',
+	'PKG_CONFIG'	=> 'pkg-config',
+);
+
+# make makes things difficult by not providing a simple way to test
+# whether a Makefile target exists. Using -n and checking for a nonzero
+# exit status is not good enough, because even with -n, make will
+# run commands needed to eg, generate include files -- and those commands
+# could fail even though the target exists -- and we should let the target
+# run and propagate any failure.
+#
+# Using -n and checking for at least one line of output is better.
+# That will indicate make either wants to run one command, or
+# has output a "nothing to be done" message if the target exists but is a
+# noop.
+#
+# However, that heuristic is also not good enough, because a Makefile
+# could run code that outputs something, even though the -n is asking
+# it not to run anything. (Again, done for includes.) To detect this false
+# positive, there is unfortunately only one approach left: To
+# look for the error message printed by make when a target does not exist.
+#
+# This could break if make's output changes. It would only break a minority
+# of packages where this latter test is needed. The best way to avoid that
+# problem would be to fix make to have this simple and highly useful
+# missing feature.
+#
+# A final option would be to use -p and parse the output data base.
+# It's more practical for dh to use that method, since it operates on
+# only special debian/rules files, and not arbitrary Makefiles which
+# can be arbitrarily complicated, use implicit targets, and so on.
+sub exists_make_target {
+	my $this=shift;
+	my $target=shift;
+
+	my @opts=("-s", "-n", "--no-print-directory");
+	my $buildpath = $this->get_buildpath();
+	unshift @opts, "-C", $buildpath if $buildpath ne ".";
+
+	my $pid = open(MAKE, "-|");
+	defined($pid) || error("fork failed: $!");
+	if (! $pid) {
+		open(STDERR, ">&STDOUT");
+		$ENV{LC_ALL}='C';
+		exec($this->{makecmd}, @opts, $target, @_);
+		exit(1);
+	}
+
+	local $/=undef;
+	my $output=<MAKE>;
+	chomp $output;
+	close MAKE;
+
+	return defined $output
+		&& length $output
+		&& $output !~ /\*\*\* No rule to make target (`|')\Q$target\E'/;
+}
+
+sub do_make {
+	my $this=shift;
+
+	# Avoid possible warnings about unavailable jobserver,
+	# and force make to start a new jobserver.
+	clean_jobserver_makeflags();
+
+	# Note that this will override any -j settings in MAKEFLAGS.
+	my $parallel = $this->get_parallel();
+	if ($parallel == 0 or $parallel > 1) {
+		# We have to use the empty string for "unlimited"
+		$parallel = '' if $parallel == 0;
+		unshift(@_, "-j${parallel}");
+	} else {
+		unshift(@_, '-j1');
+	}
+
+	my @root_cmd;
+	if (exists($this->{_run_make_as_root}) and $this->{_run_make_as_root}) {
+		@root_cmd = gain_root_cmd();
+	}
+	$this->doit_in_builddir(@root_cmd, $this->{makecmd}, @_);
+}
+
+sub make_first_existing_target {
+	my $this=shift;
+	my $targets=shift;
+
+	foreach my $target (@$targets) {
+		if ($this->exists_make_target($target, @_)) {
+			$this->do_make($target, @_);
+			return $target;
+		}
+	}
+	return undef;
+}
+
+sub DESCRIPTION {
+	"simple Makefile"
+}
+
+sub new {
+	my $class=shift;
+	my $this=$class->SUPER::new(@_);
+	$this->{makecmd} = (exists $ENV{MAKE}) ? $ENV{MAKE} : "make";
+	return $this;
+}
+
+sub check_auto_buildable {
+	my $this=shift;
+	my ($step) = @_;
+
+	if (-e $this->get_buildpath("Makefile") ||
+	    -e $this->get_buildpath("makefile") ||
+	    -e $this->get_buildpath("GNUmakefile"))
+	{
+		# This is always called in the source directory, but generally
+		# Makefiles are created (or live) in the build directory.
+		return 1;
+	} elsif ($this->check_auto_buildable_clean_oos_buildir(@_)
+			 and $this->check_auto_buildable('configure')) {
+		# Assume that the package can be cleaned (i.e. the build directory can
+		# be removed) as long as it is built out-of-source tree and can be
+		# configured. This is useful for derivative buildsystems which
+		# generate Makefiles.
+		return 1;
+	}
+	return 0;
+}
+
+sub _should_inject_cross_build_tools {
+	my ($this) = @_;
+	return ref($this) eq 'Debian::Debhelper::Buildsystem::makefile';
+}
+
+
+sub build {
+	my $this=shift;
+	if (not $this->_is_targetbuildsystem
+			and is_cross_compiling()
+			and $this->_should_inject_cross_build_tools) {
+		# Only inject build tools variables during cross-compile when
+		# makefile is the explicit *main* build system.
+		for my $var (sort(keys(%DEB_DEFAULT_TOOLS))) {
+			my $tool = $DEB_DEFAULT_TOOLS{$var};
+			if ($ENV{$var}) {
+				unshift @_, $var . "=" . $ENV{$var};
+			} else {
+				unshift @_, $var . "=" . dpkg_architecture_value("DEB_HOST_GNU_TYPE") . "-" . $tool;
+			}
+		}
+	}
+	if (ref($this) eq 'Debian::Debhelper::Buildsystem::makefile' and not compat(10)) {
+		unshift @_, "INSTALL=install --strip-program=true";
+	}
+	$this->do_make(@_);
+}
+
+sub test {
+	my $this=shift;
+	$this->make_first_existing_target(['test', 'check'], @_);
+}
+
+sub install {
+	my $this=shift;
+	my $destdir=shift;
+	if (ref($this) eq 'Debian::Debhelper::Buildsystem::makefile' and not compat(10)) {
+		unshift @_, "INSTALL=install --strip-program=true";
+	}
+	if ( -f $this->get_buildpath('libtool')) {
+		$this->disable_parallel();
+	}
+
+	if (should_use_root('debhelper/upstream-make-install') and $< != 0) {
+		$this->{_run_make_as_root} = 1;
+	}
+
+	$this->make_first_existing_target(['install'],
+		"DESTDIR=$destdir",
+		"AM_UPDATE_INFO_DIR=no", @_);
+}
+
+sub clean {
+	my $this=shift;
+	if (!$this->rmdir_builddir()) {
+		$this->make_first_existing_target(['distclean', 'realclean', 'clean'], @_);
+	}
+}
+
+1
diff --git a/lib/Debian/Debhelper/Buildsystem/meson.pm b/lib/Debian/Debhelper/Buildsystem/meson.pm
new file mode 100644
index 0000000..a695445
--- /dev/null
+++ b/lib/Debian/Debhelper/Buildsystem/meson.pm
@@ -0,0 +1,175 @@
+# A debhelper build system class for handling Meson based projects.
+#
+# Copyright: © 2017 Michael Biebl
+# License: GPL-2+
+
+package Debian::Debhelper::Buildsystem::meson;
+
+use strict;
+use warnings;
+use Debian::Debhelper::Dh_Lib qw(compat dpkg_architecture_value is_cross_compiling doit warning error generated_file qx_cmd);
+use parent qw(Debian::Debhelper::Buildsystem);
+
+sub DESCRIPTION {
+	"Meson (meson.build)"
+}
+
+sub IS_GENERATOR_BUILD_SYSTEM {
+	return 1;
+}
+
+sub SUPPORTED_TARGET_BUILD_SYSTEMS {
+	return qw(ninja);
+}
+
+
+sub check_auto_buildable {
+	my $this=shift;
+	my ($step)=@_;
+
+	return 0 unless -e $this->get_sourcepath("meson.build");
+
+	# Handle configure explicitly; inherit the rest
+	return 1 if $step eq "configure";
+	my $ret = $this->get_targetbuildsystem->check_auto_buildable(@_);
+	if ($ret == 0 and $this->check_auto_buildable_clean_oos_buildir(@_)) {
+		# Assume that the package can be cleaned (i.e. the build directory can
+		# be removed) as long as it is built out-of-source tree and can be
+		# configured.
+		$ret++;
+	}
+	return $ret;
+}
+
+sub new {
+	my $class=shift;
+	my $this=$class->SUPER::new(@_);
+	$this->prefer_out_of_source_building(@_);
+	return $this;
+}
+
+sub _get_meson_env {
+	my $update_env = {
+		LC_ALL => 'C.UTF-8',
+	};
+	$update_env->{DEB_PYTHON_INSTALL_LAYOUT} = 'deb' unless $ENV{DEB_PYTHON_INSTALL_LAYOUT};
+	return $update_env;
+}
+
+sub configure {
+	my $this=shift;
+
+	eval { require Dpkg::Version; };
+	error($@) if $@;
+
+	my $output = qx_cmd('meson', '--version');
+	chomp $output;
+	my $version = Dpkg::Version->new($output);
+
+	# Standard set of options for meson.
+	my @opts = (
+		'--wrap-mode=nodownload',
+	);
+	push @opts, "--buildtype=plain";
+	push @opts, "--prefix=/usr";
+	push @opts, "--sysconfdir=/etc";
+	push @opts, "--localstatedir=/var";
+	my $multiarch=dpkg_architecture_value("DEB_HOST_MULTIARCH");
+	push @opts, "--libdir=lib/$multiarch";
+	push(@opts, "--libexecdir=lib/$multiarch") if compat(11);
+	# There was a behaviour change in Meson 1.2.0: previously
+	# byte-compilation wasn't supported, but since 1.2.0 it is on by
+	# default. We can only use this option to turn it off in versions
+	# where the option exists.
+	push(@opts, "-Dpython.bytecompile=-1") if $version >= '1.2.0';
+	push(@opts, '--auto-features=enabled') if not compat(13);
+
+	if (is_cross_compiling()) {
+		# http://mesonbuild.com/Cross-compilation.html
+		my $cross_file = $ENV{'DH_MESON_CROSS_FILE'};
+		if (not $cross_file) {
+			my $debcrossgen = '/usr/share/meson/debcrossgen';
+			if (not -x $debcrossgen) {
+				warning("Missing debcrossgen (${debcrossgen}) cannot generate a meson cross file and non was provided");
+				error("Cannot cross-compile: Please use meson (>= 0.42.1) or provide a cross file via DH_MESON_CROSS_FILE");
+			}
+			my $filename = generated_file('_source', 'meson-cross-file.conf');
+			my %options = (
+				stdout => '/dev/null',
+				update_env => { LC_ALL => 'C.UTF-8'},
+			);
+			doit(\%options, $debcrossgen, "-o${filename}");
+			$cross_file = $filename;
+		}
+		if ($cross_file !~ m{^/}) {
+			# Make the file name absolute as meson will be called from the build dir.
+			require Cwd;
+			$cross_file =~ s{^\./}{};
+			$cross_file = Cwd::getcwd() . "/${cross_file}";
+		}
+		push(@opts, '--cross-file', $cross_file);
+	}
+
+	$this->mkdir_builddir();
+	eval {
+		my %options = (
+			update_env => _get_meson_env(),
+		);
+		$this->doit_in_builddir(\%options, "meson", "setup", $this->get_source_rel2builddir(), @opts, @_);
+	};
+	if ($@) {
+		if (-e $this->get_buildpath("meson-logs/meson-log.txt")) {
+			$this->doit_in_builddir('tail', '-v', '-n', '+0', 'meson-logs/meson-log.txt');
+		}
+		die $@;
+	}
+}
+
+sub test {
+	my $this = shift;
+	my $target = $this->get_targetbuildsystem;
+
+	eval {
+		if (compat(12) or $target->NAME ne 'ninja') {
+			$target->test(@_);
+		} else {
+			# In compat 13 with meson+ninja, we prefer using "meson test"
+			# over "ninja test"
+			my %options = (
+				update_env => _get_meson_env(),
+			);
+			if ($this->get_parallel() > 0) {
+				$options{update_env}{MESON_TESTTHREADS} = $this->get_parallel();
+			}
+			$this->doit_in_builddir(\%options, 'meson', 'test', @_);
+		}
+	};
+	if (my $err = $@) {
+		if (-e $this->get_buildpath("meson-logs/testlog.txt")) {
+			$this->doit_in_builddir('tail', '-v', '-n', '+0', 'meson-logs/testlog.txt');
+		}
+		die $err;
+	}
+	return 1;
+}
+
+sub install {
+	my ($this, $destdir, @args) = @_;
+	my $target = $this->get_targetbuildsystem;
+
+	if (compat(13) or $target->NAME ne 'ninja') {
+		$target->install($destdir, @args);
+	} else {
+		# In compat 14 with meson+ninja, we prefer using "meson install"
+		# over "ninja install"
+		my %options = (
+			update_env => _get_meson_env(),
+		);
+		$this->doit_in_builddir(\%options, 'meson', 'install', '--destdir', $destdir, @args);
+	}
+	return 1;
+}
+
+
+
+1
diff --git a/lib/Debian/Debhelper/Buildsystem/ninja.pm b/lib/Debian/Debhelper/Buildsystem/ninja.pm
new file mode 100644
index 0000000..c08ff16
--- /dev/null
+++ b/lib/Debian/Debhelper/Buildsystem/ninja.pm
@@ -0,0 +1,90 @@
+# A debhelper build system class for handling ninja based projects.
+#
+# Copyright: © 2017 Michael Biebl
+# License: GPL-2+
+
+package Debian::Debhelper::Buildsystem::ninja;
+
+use strict;
+use warnings;
+use Debian::Debhelper::Dh_Lib qw(%dh dpkg_architecture_value);
+use parent qw(Debian::Debhelper::Buildsystem);
+
+sub DESCRIPTION {
+	"Ninja (build.ninja)"
+}
+
+sub new {
+	my $class=shift;
+	my $this=$class->SUPER::new(@_);
+	$this->{buildcmd} = "ninja";
+	return $this;
+}
+
+sub check_auto_buildable {
+	my $this=shift;
+	my ($step) = @_;
+
+	if (-e $this->get_buildpath("build.ninja"))
+	{
+		# This is always called in the source directory, but generally
+		# Ninja files are created (or live) in the build directory.
+		return 1;
+	}
+	return 0;
+}
+
+sub build {
+	my $this=shift;
+	my %options = (
+		update_env => {
+			'LC_ALL' => 'C.UTF-8',
+		}
+	);
+	if (!$dh{QUIET}) {
+		unshift @_, "-v";
+	}
+	if ($this->get_parallel() > 0) {
+		unshift @_, "-j" . $this->get_parallel();
+	}
+	$this->doit_in_builddir(\%options, $this->{buildcmd}, @_);
+}
+
+sub test {
+	my $this=shift;
+	my %options = (
+		update_env => {
+			'LC_ALL' => 'C.UTF-8',
+		}
+	);
+	if ($this->get_parallel() > 0) {
+		$options{update_env}{MESON_TESTTHREADS} = $this->get_parallel();
+	}
+	$this->doit_in_builddir(\%options, $this->{buildcmd}, "test", @_);
+}
+
+sub install {
+	my $this=shift;
+	my $destdir=shift;
+	my %options = (
+		update_env => {
+			'LC_ALL'  => 'C.UTF-8',
+			'DESTDIR' => $destdir,
+		}
+	);
+	$this->doit_in_builddir(\%options, $this->{buildcmd}, "install", @_);
+}
+
+sub clean {
+	my $this=shift;
+	if (!$this->rmdir_builddir()) {
+		my %options = (
+			update_env => {
+				'LC_ALL'  => 'C.UTF-8',
+			}
+		);
+		$this->doit_in_builddir(\%options, $this->{buildcmd}, "clean", @_);
+	}
+}
+
+1
diff --git a/lib/Debian/Debhelper/Buildsystem/perl_build.pm b/lib/Debian/Debhelper/Buildsystem/perl_build.pm
new file mode 100644
index 0000000..8752905
--- /dev/null
+++ b/lib/Debian/Debhelper/Buildsystem/perl_build.pm
@@ -0,0 +1,97 @@
+# A build system class for handling Perl Build based projects.
+#
+# Copyright: © 2008-2009 Joey Hess
+#            © 2008-2009 Modestas Vainius
+# License: GPL-2+
+
+package Debian::Debhelper::Buildsystem::perl_build;
+
+use strict;
+use warnings;
+use Debian::Debhelper::Dh_Lib qw(compat is_cross_compiling perl_cross_incdir warning);
+use parent qw(Debian::Debhelper::Buildsystem);
+use Config;
+
+sub DESCRIPTION {
+	"Perl Module::Build (Build.PL)"
+}
+
+sub check_auto_buildable {
+	my ($this, $step) = @_;
+
+	# Handles everything
+	my $ret = -e $this->get_sourcepath("Build.PL");
+	if ($step ne "configure") {
+		$ret &&= -e $this->get_sourcepath("Build");
+	}
+	return $ret ? 1 : 0;
+}
+
+sub do_perl {
+	my $this=shift;
+	my %options;
+	if (is_cross_compiling()) {
+		my $cross_incdir = perl_cross_incdir();
+		if (defined $cross_incdir) {
+			my $perl5lib = $cross_incdir;
+			$perl5lib .= $Config{path_sep} . $ENV{PERL5LIB}
+				if defined $ENV{PERL5LIB};
+			$options{update_env} = { PERL5LIB => $perl5lib };
+		} else {
+			warning("cross Config.pm does not exist (missing build dependency on perl-xs-dev?)");
+		}
+	}
+	$this->doit_in_sourcedir(\%options, $^X, @_);
+}
+
+sub new {
+	my $class=shift;
+	my $this= $class->SUPER::new(@_);
+	$this->enforce_in_source_building();
+	return $this;
+}
+
+sub configure {
+	my $this=shift;
+	my (@flags, @perl_flags);
+	$ENV{PERL_MM_USE_DEFAULT}=1;
+	if ($ENV{CFLAGS} && ! compat(8)) {
+		push @flags, "--config", "optimize=$ENV{CFLAGS} $ENV{CPPFLAGS}";
+	}
+	if ($ENV{LDFLAGS} && ! compat(8)) {
+		my $ld = $Config{ld};
+		if (is_cross_compiling()) {
+			my $incdir = perl_cross_incdir();
+			$ld = qx/perl -I$incdir -MConfig -e 'print \$Config{ld}'/
+				if defined $incdir;
+		}
+		push @flags, "--config", "ld=$ld $ENV{CFLAGS} $ENV{LDFLAGS}";
+	}
+	push(@perl_flags, '-I.') if compat(10);
+	$this->do_perl(@perl_flags, "Build.PL", "--installdirs", "vendor", @flags, @_);
+}
+
+sub build {
+	my $this=shift;
+	$this->do_perl("Build", @_);
+}
+
+sub test {
+	my $this=shift;
+	$this->do_perl("Build", "test", "--verbose", 1, @_);
+}
+
+sub install {
+	my $this=shift;
+	my $destdir=shift;
+	$this->do_perl("Build", "install", "--destdir", "$destdir", "--create_packlist", 0, @_);
+}
+
+sub clean {
+	my $this=shift;
+	if (-e $this->get_sourcepath("Build")) {
+		$this->do_perl("Build", "realclean", "--allow_mb_mismatch", 1, @_);
+	}
+}
+
+1
diff --git a/lib/Debian/Debhelper/Buildsystem/perl_makemaker.pm b/lib/Debian/Debhelper/Buildsystem/perl_makemaker.pm
new file mode 100644
index 0000000..881f1ec
--- /dev/null
+++ b/lib/Debian/Debhelper/Buildsystem/perl_makemaker.pm
@@ -0,0 +1,104 @@
+# A debhelper build system class for handling Perl MakeMaker based projects.
+#
+# Copyright: © 2008-2009 Joey Hess
+#            © 2008-2009 Modestas Vainius
+# License: GPL-2+
+
+package Debian::Debhelper::Buildsystem::perl_makemaker;
+
+use strict;
+use warnings;
+use Debian::Debhelper::Dh_Lib qw(compat is_cross_compiling perl_cross_incdir warning);
+use parent qw(Debian::Debhelper::Buildsystem::makefile);
+use Config;
+
+sub DESCRIPTION {
+	"Perl ExtUtils::MakeMaker (Makefile.PL)"
+}
+
+sub check_auto_buildable {
+	my $this=shift;
+	my ($step)=@_;
+
+	# Handles everything if Makefile.PL exists. Otherwise - next class.
+	if (-e $this->get_sourcepath("Makefile.PL")) {
+		if ($step eq "configure") {
+			return 1;
+		}
+		else {
+			return $this->SUPER::check_auto_buildable(@_);
+		}
+	}
+	return 0;
+}
+
+sub new {
+	my $class=shift;
+	my $this=$class->SUPER::new(@_);
+	$this->enforce_in_source_building();
+	return $this;
+}
+
+sub configure {
+	my $this=shift;
+	my (@flags, @perl_flags);
+	# If set to a true value then MakeMaker's prompt function will
+	# # always return the default without waiting for user input.
+	$ENV{PERL_MM_USE_DEFAULT}=1;
+	# This prevents  Module::Install from interactive behavior.
+	$ENV{PERL_AUTOINSTALL}="--skipdeps";
+
+	if ($ENV{CFLAGS} && ! compat(8)) {
+		push @flags, "OPTIMIZE=$ENV{CFLAGS} $ENV{CPPFLAGS}";
+	}
+	my $cross_flag;
+	if (is_cross_compiling()) {
+		my $incdir = perl_cross_incdir();
+		if (defined $incdir) {
+			$cross_flag = "-I$incdir";
+		} else {
+			warning("cross Config.pm does not exist (missing build dependency on perl-xs-dev?)");
+		}
+	}
+	if ($ENV{LDFLAGS} && ! compat(8)) {
+		my $ld = $Config{ld};
+		$ld = qx/perl $cross_flag -MConfig -e 'print \$Config{ld}'/
+			if is_cross_compiling() and defined $cross_flag;
+		push @flags, "LD=$ld $ENV{CFLAGS} $ENV{LDFLAGS}";
+	}
+
+	push(@perl_flags, '-I.') if compat(10);
+
+	push @perl_flags, $cross_flag
+		if is_cross_compiling() and defined $cross_flag;
+
+	$this->doit_in_sourcedir($^X, @perl_flags, "Makefile.PL", "INSTALLDIRS=vendor",
+		# if perl_build is not tested first, need to pass packlist
+		# option to handle fallthrough case
+		(compat(7) ? "create_packlist=0" : ()),
+		@flags, @_);
+}
+
+sub test {
+	my $this=shift;
+	# Make tests verbose
+	$this->SUPER::test("TEST_VERBOSE=1", @_);
+}
+
+sub install {
+	my $this=shift;
+	my $destdir=shift;
+
+	# Special case for Makefile.PL that uses
+	# Module::Build::Compat. PREFIX should not be passed
+	# for those; it already installs into /usr by default.
+	my $makefile=$this->get_sourcepath("Makefile");
+	if (system(qq{grep -q "generated automatically by MakeMaker" $makefile}) != 0) {
+		$this->SUPER::install($destdir, @_);
+	}
+	else {
+		$this->SUPER::install($destdir, "PREFIX=/usr", @_);
+	}
+}
+
+1
diff --git a/lib/Debian/Debhelper/Buildsystem/python_distutils.pm b/lib/Debian/Debhelper/Buildsystem/python_distutils.pm
new file mode 100644
index 0000000..e5fe7ed
--- /dev/null
+++ b/lib/Debian/Debhelper/Buildsystem/python_distutils.pm
@@ -0,0 +1,214 @@
+# A debhelper build system class for building Python Distutils based
+# projects. It prefers out of source tree building.
+#
+# Copyright: © 2008 Joey Hess
+#            © 2008-2009 Modestas Vainius
+# License: GPL-2+
+
+package Debian::Debhelper::Buildsystem::python_distutils;
+
+use strict;
+use warnings;
+use Cwd ();
+use Debian::Debhelper::Dh_Lib qw(error deprecated_functionality);
+use parent qw(Debian::Debhelper::Buildsystem);
+
+sub DESCRIPTION {
+	"Python Distutils (setup.py) [DEPRECATED]"
+}
+
+sub DEFAULT_BUILD_DIRECTORY {
+	my $this=shift;
+	return $this->canonpath($this->get_sourcepath("build"));
+}
+
+sub new {
+	my $class=shift;
+	my $this=$class->SUPER::new(@_);
+	# Out of source tree building is preferred.
+	$this->prefer_out_of_source_building(@_);
+	return $this;
+}
+
+sub check_auto_buildable {
+	my $this=shift;
+	return -e $this->get_sourcepath("setup.py") ? 1 : 0;
+}
+
+sub not_our_cfg {
+	my $this=shift;
+	my $ret;
+	if (open(my $cfg, '<', $this->get_buildpath(".pydistutils.cfg"))) {
+		$ret = not "# Created by dh_auto\n" eq <$cfg>;
+		close $cfg;
+	}
+	return $ret;
+}
+
+sub create_cfg {
+	my $this=shift;
+	if (open(my $cfg, ">", $this->get_buildpath(".pydistutils.cfg"))) {
+		print $cfg "# Created by dh_auto", "\n";
+		print $cfg "[build]\nbuild-base=", $this->get_build_rel2sourcedir(), "\n";
+		close $cfg;
+		return 1;
+	}
+	return 0;
+}
+
+sub pre_building_step {
+	my $this=shift;
+	my $step=shift;
+
+	deprecated_functionality('Please use the third-party "pybuild" build system instead of python-distutils',
+		12);
+
+	return unless grep /$step/, qw(build install clean);
+
+	if ($this->get_buildpath() ne $this->DEFAULT_BUILD_DIRECTORY()) {
+		# --build-base can only be passed to the build command. However,
+		# it is always read from the config file (really weird design).
+		# Therefore create such a cfg config file.
+		# See http://bugs.python.org/issue818201
+		#     http://bugs.python.org/issue1011113
+		not $this->not_our_cfg() or
+		    error("cannot set custom build directory: .pydistutils.cfg is in use");
+		$this->mkdir_builddir();
+		$this->create_cfg() or
+		    error("cannot set custom build directory: unwritable .pydistutils.cfg");
+		# Distutils reads $HOME/.pydistutils.cfg
+		$ENV{HOME} = Cwd::abs_path($this->get_buildpath());
+	}
+
+	$this->SUPER::pre_building_step($step);
+}
+
+sub dbg_build_needed {
+	my $this=shift;
+	my $act=shift;
+
+	# Return a list of python-dbg package which are listed
+	# in the build-dependencies. This is kinda ugly, but building
+	# dbg extensions without checking if they're supposed to be
+	# built may result in various FTBFS if the package is not
+	# built in a clean chroot.
+
+	my @dbg;
+	open (my $fd, '<', 'debian/control') ||
+		error("cannot read debian/control: $!\n");
+	foreach my $builddeps (join('', <$fd>) =~
+			/^Build-Depends[^:]*:.*\n(?:^[^\w\n].*\n)*/gmi) {
+		while ($builddeps =~ /(python[^, ]*-dbg)/g) {
+			push @dbg, $1;
+		}
+	}
+
+	close($fd);
+	return @dbg;
+
+}
+
+sub setup_py {
+	my $this=shift;
+	my $act=shift;
+
+	# We need to run setup.py with the default python last
+	# as distutils/setuptools modifies the shebang lines of scripts.
+	# This ensures that #!/usr/bin/python is installed last and
+	# not pythonX.Y
+	# Take into account that the default Python must not be in
+	# the requested Python versions.
+	# Then, run setup.py with each available python, to build
+	# extensions for each.
+
+	my $python_default = `pyversions -d`;
+	if ($? == -1) {
+		error("failed to run pyversions")
+	}
+	my $ecode = $? >> 8;
+	if ($ecode != 0) {
+		error("pyversions -d failed [$ecode]")
+	}
+	$python_default =~ s/^\s+//;
+	$python_default =~ s/\s+$//;
+	my @python_requested = split ' ', `pyversions -r`;
+	if ($? == -1) {
+		error("failed to run pyversions")
+	}
+	$ecode = $? >> 8;
+	if ($ecode != 0) {
+		error("pyversions -r failed [$ecode]")
+	}
+	if (grep /^\Q$python_default\E/, @python_requested) {
+		@python_requested = (
+			grep(!/^\Q$python_default\E/, @python_requested),
+			"python",
+		);
+	}
+
+	my @python_dbg;
+	my @dbg_build_needed = $this->dbg_build_needed();
+	foreach my $python (map { $_."-dbg" } @python_requested) {
+		if (grep /^(python-all-dbg|\Q$python\E)/, @dbg_build_needed) {
+			push @python_dbg, $python;
+		}
+		elsif (($python eq "python-dbg")
+		       and (grep /^\Q$python_default\E/, @dbg_build_needed)) {
+			push @python_dbg, $python_default."-dbg";
+		}
+	}
+
+	foreach my $python (@python_dbg, @python_requested) {
+		if (-x "/usr/bin/".$python) {
+			# To allow backports of debhelper we don't pass
+			# --install-layout=deb to 'setup.py install` for
+			# those Python versions where the option is
+			# ignored by distutils/setuptools.
+			if ( $act eq "install" and not
+			     ( ($python =~ /^python(?:-dbg)?$/
+			         and $python_default =~ /^python2\.[2345]$/)
+			      or $python =~ /^python2\.[2345](?:-dbg)?$/ )) {
+				$this->doit_in_sourcedir($python, "setup.py",
+						$act, @_, "--install-layout=deb");
+			}
+			else {
+				$this->doit_in_sourcedir($python, "setup.py",
+						$act, @_);
+			}
+		}
+	}
+}
+
+sub build {
+	my $this=shift;
+	$this->setup_py("build",
+		"--force",
+		@_);
+}
+
+sub install {
+	my $this=shift;
+	my $destdir=shift;
+	$this->setup_py("install",
+		"--force",
+		"--root=$destdir",
+		"--no-compile",
+		"-O0",
+		@_);
+}
+
+sub clean {
+	my $this=shift;
+	$this->setup_py("clean", "-a", @_);
+
+	# Config file will remain if it was created by us
+	if (!$this->not_our_cfg()) {
+		unlink($this->get_buildpath(".pydistutils.cfg"));
+		$this->rmdir_builddir(1); # only if empty
+	}
+	# The setup.py might import files, leading to python creating pyc
+	# files.
+	$this->doit_in_sourcedir('find', '.', '-name', '*.pyc', '-exec', 'rm', '{}', '+');
+}
+
+1
diff --git a/lib/Debian/Debhelper/Buildsystem/qmake.pm b/lib/Debian/Debhelper/Buildsystem/qmake.pm
new file mode 100644
index 0000000..18b896d
--- /dev/null
+++ b/lib/Debian/Debhelper/Buildsystem/qmake.pm
@@ -0,0 +1,103 @@
+# A debhelper build system class for Qt projects
+# (based on the makefile class).
+#
+# Copyright: © 2010 Kelvin Modderman
+# License: GPL-2+
+
+package Debian::Debhelper::Buildsystem::qmake;
+
+use strict;
+use warnings;
+use Debian::Debhelper::Dh_Lib qw(dpkg_architecture_value error is_cross_compiling);
+use parent qw(Debian::Debhelper::Buildsystem::makefile);
+
+my %OS_MKSPEC_MAPPING = (
+	'linux'    => 'linux-g++',
+	'kfreebsd' => 'gnukfreebsd-g++',
+	'hurd'     => 'hurd-g++',
+);
+
+sub DESCRIPTION {
+	"qmake (*.pro)";
+}
+
+sub check_auto_buildable {
+	my $this=shift;
+	my @projects=glob($this->get_sourcepath('*.pro'));
+	my $ret=0;
+
+	if (@projects > 0) {
+		$ret=1;
+		# Existence of a Makefile generated by qmake indicates qmake
+		# class has already been used by a prior build step, so should
+		# be used instead of the parent makefile class.
+		my $mf=$this->get_buildpath("Makefile");
+		if (-e $mf) {
+			$ret = $this->SUPER::check_auto_buildable(@_);
+			open(my $fh, '<', $mf)
+				or error("unable to open Makefile: $mf");
+			while(<$fh>) {
+				if (m/^# Generated by qmake/i) {
+					$ret++;
+					last;
+				}
+			}
+			close($fh);
+		}
+	}
+
+	return $ret;
+}
+
+sub configure {
+	my $this=shift;
+	my @options;
+	my @flags;
+
+	push @options, '-makefile';
+	if (is_cross_compiling()) {
+		my $host_os = dpkg_architecture_value("DEB_HOST_ARCH_OS");
+
+		if (defined(my $spec = $OS_MKSPEC_MAPPING{$host_os})) {
+			push(@options, "-spec", $spec);
+		} else {
+			error("Cannot cross-compile: Missing entry for HOST OS ${host_os} for qmake's -spec option");
+		}
+	}
+
+	if ($ENV{CFLAGS}) {
+		push @flags, "QMAKE_CFLAGS_RELEASE=$ENV{CFLAGS} $ENV{CPPFLAGS}";
+		push @flags, "QMAKE_CFLAGS_DEBUG=$ENV{CFLAGS} $ENV{CPPFLAGS}";
+	}
+	if ($ENV{CXXFLAGS}) {
+		push @flags, "QMAKE_CXXFLAGS_RELEASE=$ENV{CXXFLAGS} $ENV{CPPFLAGS}";
+		push @flags, "QMAKE_CXXFLAGS_DEBUG=$ENV{CXXFLAGS} $ENV{CPPFLAGS}";
+	}
+	if ($ENV{LDFLAGS}) {
+		push @flags, "QMAKE_LFLAGS_RELEASE=$ENV{LDFLAGS}";
+		push @flags, "QMAKE_LFLAGS_DEBUG=$ENV{LDFLAGS}";
+	}
+	push @flags, "QMAKE_STRIP=:";
+	push @flags, "PREFIX=/usr";
+
+	$this->mkdir_builddir();
+	$this->doit_in_builddir($this->_qmake(), @options, @flags, @_);
+}
+
+sub install {
+	my $this=shift;
+	my $destdir=shift;
+
+	# qmake generated Makefiles use INSTALL_ROOT in install target
+	# where one would expect DESTDIR to be used.
+	$this->SUPER::install($destdir, "INSTALL_ROOT=$destdir", @_);
+}
+
+sub _qmake {
+	if (is_cross_compiling()) {
+		return dpkg_architecture_value("DEB_HOST_GNU_TYPE") . "-qmake";
+	}
+	return 'qmake';
+}
+
+1
diff --git a/lib/Debian/Debhelper/Buildsystem/qmake6.pm b/lib/Debian/Debhelper/Buildsystem/qmake6.pm
new file mode 100644
index 0000000..e2c3294
--- /dev/null
+++ b/lib/Debian/Debhelper/Buildsystem/qmake6.pm
@@ -0,0 +1,19 @@
+package Debian::Debhelper::Buildsystem::qmake6;
+
+use strict;
+use warnings;
+use parent qw(Debian::Debhelper::Buildsystem::qmake);
+use Debian::Debhelper::Dh_Lib qw(is_cross_compiling dpkg_architecture_value);
+
+sub DESCRIPTION {
+	"qmake for QT 6 (*.pro)";
+}
+
+sub _qmake {
+	if (is_cross_compiling()) {
+		return dpkg_architecture_value("DEB_HOST_GNU_TYPE") . '-qmake6';
+	}
+	return 'qmake6';
+}
+
+1
diff --git a/lib/Debian/Debhelper/Buildsystem/qmake_qt4.pm b/lib/Debian/Debhelper/Buildsystem/qmake_qt4.pm
new file mode 100644
index 0000000..60d9084
--- /dev/null
+++ b/lib/Debian/Debhelper/Buildsystem/qmake_qt4.pm
@@ -0,0 +1,15 @@
+package Debian::Debhelper::Buildsystem::qmake_qt4;
+
+use strict;
+use warnings;
+use parent qw(Debian::Debhelper::Buildsystem::qmake);
+
+sub DESCRIPTION {
+	"qmake for QT 4 (*.pro)";
+}
+
+sub _qmake {
+	return 'qmake-qt4';
+}
+
+1