diff --git a/.gitignore b/.gitignore
index 6199c3a..1e441da 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1 @@
 /v-hacd-4.1.0-filtered.tar.xz
-/v-hacd-4.1.0-filtered.tar.zst
diff --git a/cube.obj b/cube.obj
deleted file mode 100644
index 3f91d36..0000000
--- a/cube.obj
+++ /dev/null
@@ -1,18 +0,0 @@
-# Blender v2.83.4 OBJ File: ''
-# www.blender.org
-o Cube_Cube.001
-v -1.000000 -1.000000 1.000000
-v -1.000000 1.000000 1.000000
-v -1.000000 1.000000 -1.000000
-v -1.000000 -1.000000 -1.000000
-v 1.000000 1.000000 -1.000000
-v 1.000000 -1.000000 -1.000000
-v 1.000000 1.000000 1.000000
-v 1.000000 -1.000000 1.000000
-s off
-f 1 2 3 4
-f 4 3 5 6
-f 6 5 7 8
-f 8 7 2 1
-f 4 6 8 1
-f 5 3 2 7
diff --git a/get_source.sh b/get_source.sh
index cc2fd8f..3902a3e 100755
--- a/get_source.sh
+++ b/get_source.sh
@@ -10,7 +10,7 @@ print_help()
 Usage: $1 VERSION
 
 Generate a source archive for v-hacd with questionably-licensed test/sample
-meshes removed. The result will be named v-hacd-\${VERSION}-filtered.tar.zst
+meshes removed. The result will be named v-hacd-\${VERSION}-filtered.tar.xz
 and will be written into the current working directory.
 EOF
 }
@@ -30,7 +30,7 @@ VERSION="${1}"
 SOURCE0="${FORGEURL}/archive/v${VERSION}/v-hacd-${VERSION}.tar.gz"
 TARNAME="$(basename "${SOURCE0}")"
 TARDIR="$(basename "${SOURCE0}" '.tar.gz')"
-NEWTAR="${TARDIR}-filtered.tar.zst"
+NEWTAR="${TARDIR}-filtered.tar.xz"
 
 SAVEDIR="${PWD}"
 XDIR="$(mktemp -d)"
@@ -39,27 +39,13 @@ trap "rm -rvf '${XDIR}'" INT TERM EXIT
 cd "${XDIR}"
 curl -L -O "${SOURCE0}"
 tar -xzvf "${TARNAME}"
-MTIME="$(stat -c '%Y' "${TARDIR}")"
 rm -rvf "${TARDIR}/app/meshes"
 if [ "$(find . -type f -name '*.obj' | wc -l)" != '0' ]
 then
 	echo 'ERROR: did not properly remove problematic content' 1>&2
 	exit 1
 fi
-# https://www.gnu.org/software/tar/manual/html_section/Reproducibility.html
-# We reset all mtimes to that of the top-level extracted directory; since git
-# archives don’t have meaningful per-file mtimes, nothing useful is lost.
-TZ=UTC LC_ALL=C tar \
-    --create --verbose \
-    --sort=name \
-    --format=posix \
-    --numeric-owner --owner=0 --group=0 \
-    --mode=go+u,go-w \
-    --pax-option='delete=atime,delete=ctime' \
-    --clamp-mtime --mtime="@${MTIME}" \
-    "${TARDIR}/" |
-  zstdmt --ultra -22 > "${NEWTAR}"
-touch -d @"${MTIME}" "${NEWTAR}"
+tar -cv "${TARDIR}/" | xz -9e > "${NEWTAR}"
 
 cd "${SAVEDIR}"
 mv -v "${XDIR}/${NEWTAR}" .
diff --git a/sources b/sources
index 2fb9dea..fe165e6 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (v-hacd-4.1.0-filtered.tar.zst) = 07ae9fcd3759c2f4038392be78faf2f24f0d03931b0e417f450d066dfe3c792b15dd2e5c929974eb93326d954be564a2dc5e3ace909656625e99421cad4e47e7
+SHA512 (v-hacd-4.1.0-filtered.tar.xz) = 9e85aeac1d3e6d3a973da6764452bd2444ee15fcf313f723e4127adb4c79e72a0f40663aee3de167b93ced8bd34c96ea1e9ec621a2704b0c58af9f31cbbee4aa
diff --git a/v-hacd.rpmlintrc b/v-hacd.rpmlintrc
deleted file mode 100644
index ec062ee..0000000
--- a/v-hacd.rpmlintrc
+++ /dev/null
@@ -1,4 +0,0 @@
-# This Source cannot be a URL because we must filter out certain files.
-addFilter(r" invalid-url Source[0-9]+: v-hacd-.*-filtered\.tar\.zst")
-# Bogus; it is a perfectly fine zstandard file.
-addFilter(r" inconsistent-file-extension v-hacd-.*-filtered\.tar\.zst$")
diff --git a/v-hacd.spec b/v-hacd.spec
index 3016be6..1b8cb13 100644
--- a/v-hacd.spec
+++ b/v-hacd.spec
@@ -1,14 +1,16 @@
+%bcond_without tests
+
 Name:           v-hacd
 Version:        4.1.0
 Release:        %autorelease
 Summary:        Decomposes a 3D surface into a set of “near” convex parts
 
+%undefine __cmake_in_source_build
+
 # The entire source is BSD-3-Clause, except:
 #   - app/wavefront.{h,cpp} are MIT
 License:        BSD-3-Clause AND MIT
-# We use an OBJ file from mcut, which is LGPL-3.0-only, for testing: Source3
-SourceLicense:  %{license} AND LGPL-3.0-only
-URL:            https://github.com/kmammou/v-hacd
+URL:            https://github.com/kmammou/%{name}
 # This has the app/meshes/ directory stripped out. The .obj files therein have
 # unclear or unspecified licenses, which makes them unsuitable for Fedora.
 #
@@ -16,21 +18,24 @@ URL:            https://github.com/kmammou/v-hacd
 # README.rst as a sanity check.
 #
 # Generated with ./get_source.sh %%{version}
-Source0:        v-hacd-%{version}-filtered.tar.zst
+Source0:        %{name}-%{version}-filtered.tar.xz
 # Script to generate Source0; see comments above.
 Source1:        get_source.sh
 # Man page hand-written for Fedora in groff_man(7) format based on help output
 # and README.md contents.
 Source2:        TestVHACD.1
-# Very trivial OBJ mesh file from mcut, which is LGPL-3.0-only
-Source3:        https://github.com/cutdigital/mcut/raw/refs/tags/v1.3.0/tutorials/BasicCmdLineApp/data/cube.obj
-
-BuildSystem:    cmake
 
 # https://fedoraproject.org/wiki/Changes/EncourageI686LeafRemoval
 ExcludeArch:    %{ix86}
 
 BuildRequires:  gcc-c++
+BuildRequires:  cmake
+# Our choice; the make backend would work just fine.
+BuildRequires:  ninja-build
+
+%if %{with tests}
+BuildRequires:  vtk-data
+%endif
 
 %global common_description %{expand:
 The V-HACD library decomposes a 3D surface into a set of “near” convex parts.
@@ -66,14 +71,15 @@ Summary:        Development files for V-HACD
 # The MIT-licensed app/wavefront.{h,cpp} do not contribute to this subpackage.
 License:        BSD-3-Clause
 
+
 BuildArch:      noarch
 
 # https://docs.fedoraproject.org/en-US/packaging-guidelines/#_packaging_header_only_libraries
-Provides:       v-hacd-static = %{?epoch:%{epoch}:}%{version}-%{release}
+Provides:       %{name}-static = %{?epoch:%{epoch}:}%{version}-%{release}
 
 %description    devel %{common_description}
 
-The v-hacd-devel package contains the header-only library for developing
+The %{name}-devel package contains the header-only library for developing
 applications that use V-HACD.
 
 
@@ -89,36 +95,45 @@ License:        BSD-3-Clause AND MIT
 
 %description    tools %{common_description}
 
-The v-hacd-tools package contains command-line tools based on the V-HACD
+The %{name}-tools package contains command-line tools based on the V-HACD
 library. Currently, this means TestVHACD; despite the name, this tool has
 general utility beyond testing.
 
 
-%conf -p
-cd app
+%prep
+%autosetup -n %{name}-%{version}
 
 
-%build -p
-cd app
+%build
+%set_build_flags
+pushd app >/dev/null
+%cmake -GNinja
+%cmake_build
+popd >/dev/null
 
 
 %install
-install -D --preserve-timestamps --mode=0644 \
-    --target='%{buildroot}%{_includedir}' 'include/VHACD.h'
-install -D --preserve-timestamps --mode=0644 \
-    --target='%{buildroot}%{_mandir}/man1' '%{SOURCE2}'
-
-cd app
+pushd app >/dev/null
 # There are currently no install targets in app/CMakeLists.txt, so
 # %%cmake_install will not work. We install the executable manually instead.
-install -D --preserve-timestamps \
-    --target='%{buildroot}%{_bindir}' '%{_vpath_builddir}/TestVHACD'
+install -t '%{buildroot}%{_bindir}' -p -D '%{_vpath_builddir}/TestVHACD'
+popd >/dev/null
+
+install -t '%{buildroot}%{_includedir}' -m 0644 -p -D 'include/VHACD.h'
+
+install -t '%{buildroot}%{_mandir}/man1' -m 0644 -p -D '%{SOURCE2}'
 
 
+%if %{with tests}
 %check
 # Use the example from README.md as a sanity check, but use an arbitrary mesh
-# as input since we cannot ship upstream’s sample meshes.
-%{buildroot}%{_bindir}/TestVHACD '%{SOURCE3}' -e 0.01 -d 15 -r 10000000 -r 128
+# from vtk as input since we cannot ship upstream’s sample meshes. Decrease the
+# max recursion depth from 15 to the default (10) so this doesn’t explode on
+# 32-bit ARM in Fedora 36.
+%{buildroot}%{_bindir}/TestVHACD \
+    %{_datadir}/vtkdata/Testing/Data/Viewpoint/cow.obj \
+    -e 0.01 -d 10 -r 10000000 -r 128
+%endif
 
 
 %files devel