diff --git a/.gitignore b/.gitignore
index bba3f77..21f69e7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,7 +7,3 @@
 /pyMapVBVD-test-data.tar.xz
 /pyMapVBVD-0.5.6.tar.gz
 /pyMapVBVD-0.5.7.tar.gz
-/pyMapVBVD-test-data.tar.zst
-/pymapvbvd-0.6.0.tar.gz
-/pymapvbvd-test-data.tar.zst
-/pymapvbvd-0.6.1.tar.gz
diff --git a/get_test_data.sh b/get_test_data.sh
index 395006a..a43c1ee 100755
--- a/get_test_data.sh
+++ b/get_test_data.sh
@@ -11,13 +11,13 @@ Usage: $1 VERSION
 
 Generate a source archive containing the test data files for pyMapVBVD that are
 tracked in git LFS and are not included in the default source archive. The
-result will be named pymapvbvd-test-data.tar.zst and will be written
+result will be named pyMapVBVD-test-data.tar.xz and will be written
 into the current working directory.
 
 The script attempts to produce a reproducible archive to avoid uploading
 near-duplicate archives to the lookaside cache when the test data does not
 change from one version to the next. Accordingly, the top-level directory
-pymapvbvd-\${VERSION}/ is omitted from the archived paths.
+pyMapVBVD-\${VERSION}/ is omitted from the archived paths.
 EOF
 }
 
@@ -45,8 +45,8 @@ GITDIR="$(echo "${FORGEURL}" | sed -r 's@.*/@@')"
 
 #SOURCE0="${FORGEURL}/archive/${VERSION}/pdfminer.six-${VERSION}.tar.gz"
 #TARNAME="$(basename "${SOURCE0}")"
-TARDIR="pymapvbvd-${VERSION}"
-NEWTAR='pymapvbvd-test-data.tar.zst'
+TARDIR="pyMapVBVD-${VERSION}"
+NEWTAR='pyMapVBVD-test-data.tar.xz'
 
 SAVEDIR="${PWD}"
 XDIR="$(mktemp -d)"
@@ -79,7 +79,7 @@ TZ=UTC LC_ALL=C tar \
 		--pax-option='delete=atime,delete=ctime' \
 		--clamp-mtime --mtime='@0' \
 		. |
-	zstdmt --ultra -22 > "${XDIR}/${NEWTAR}"
+	xz -9e > "${XDIR}/${NEWTAR}"
 
 cd "${SAVEDIR}"
 mv -v "${XDIR}/${NEWTAR}" .
diff --git a/python-pymapvbvd.rpmlintrc b/python-pymapvbvd.rpmlintrc
deleted file mode 100644
index bab460e..0000000
--- a/python-pymapvbvd.rpmlintrc
+++ /dev/null
@@ -1,9 +0,0 @@
-# Not real spelling errors.
-# - "dat" is from the extension ".dat"
-# - "twix" is a data format
-addFilter(r" spelling-error \('(dat|twix)',")
-# This source cannot be a URL because we must use a script to download its
-# contents from git-lfs.
-addFilter(r" invalid-url Source[0-9]+: pymapvbvd-test-data\.tar\.zst$")
-# Bogus; it is a perfectly fine zstandard file.
-addFilter(r" inconsistent-file-extension pymapvbvd-test-data\.tar\.zst$")
diff --git a/python-pymapvbvd.spec b/python-pymapvbvd.spec
index fbb7b36..cfc0fcb 100644
--- a/python-pymapvbvd.spec
+++ b/python-pymapvbvd.spec
@@ -1,28 +1,25 @@
 Name:           python-pymapvbvd
-Version:        0.6.1
+Version:        0.5.7
 Release:        %autorelease
 Summary:        Python twix file reader
 
 # The entire source is MIT, except:
-#   - The file pymapvbvd/_version.py, which is generated by python-versioneer,
-#     shares its license (Unlicense, for recent versions of Versioneer); see
-#     also versioneer.py (which is removed in %%prep)
+#   - The script versioneer.py and the file pymapvbvd/_version.py, which was
+#     generated by it, are both Unlicense.
 License:        MIT AND Unlicense
 URL:            https://github.com/wtclarke/pymapvbvd
-Source0:        %{pypi_source pymapvbvd}
+Source0:        %{pypi_source pyMapVBVD}
 # Generated with Source2: ./get_test_data.sh %%{version}
-Source1:        pymapvbvd-test-data.tar.zst
+Source1:        pyMapVBVD-test-data.tar.xz
 Source2:        get_test_data.sh
 
-BuildSystem:            pyproject
-BuildOption(generate_buildrequires): -x tests
-BuildOption(install):   -l mapvbvd
-
 BuildArch:      noarch
 # PyMapVBVD assumes the platform is little-endian
 # https://bugzilla.redhat.com/show_bug.cgi?id=2225518
 ExcludeArch:    s390x
 
+BuildRequires:  python3-devel
+
 %global common_description %{expand:
 Python port of the Matlab mapVBVD tool for reading Siemens raw data 'twix'
 (.dat) files.}
@@ -39,27 +36,41 @@ Summary:        %{summary}
 
 # The generated _version.py has the same license as python3dist(versioneer),
 # but we do not consider it to be bundled from Versioneer.
+#
+# The system versioneer is too old for the generated _version.py to have the
+# get_version() function, and too old for the License tag to be accurate. We
+# must use the bundled, amalgamated versioneer.py to generate _version.py.
+#
+# While versioneer.py is a bundled copy of python3dist(versioneer) = 0.28, it
+# is not included in the binary RPMs, so we still do not treat it as bundled,
+# and there is no corresponding virtual Provides.
 
 %description -n python3-pymapvbvd %{common_description}
 
 
 %prep
-%autosetup -n pymapvbvd-%{version} -p1
-%setup -q -T -D -a 1 -c -n pymapvbvd-%{version}
-# We can use the system versioneer to generate _version.py, and can remove the
-# bundled, amaglamated versioneer.py to indicate we aren’t using it.
-rm -v versioneer.py
+%autosetup -n pyMapVBVD-%{version} -p1
+%setup -q -T -D -a 1 -c -n pyMapVBVD-%{version}
 
 
-%generate_buildrequires -p
+%generate_buildrequires
 export SETUPTOOLS_SCM_PRETEND_VERSION='%{version}'
+export PYTHONPATH="${PWD}"
+%pyproject_buildrequires -x tests
 
 
-%build -p
+%build
 export SETUPTOOLS_SCM_PRETEND_VERSION='%{version}'
+export PYTHONPATH="${PWD}"
+%pyproject_wheel
 
 
-%check -a
+%install
+%pyproject_install
+%pyproject_save_files -l mapvbvd
+
+
+%check
 %pytest -v
 
 
diff --git a/sources b/sources
index 8624192..2cc74d1 100644
--- a/sources
+++ b/sources
@@ -1,2 +1,2 @@
-SHA512 (pymapvbvd-0.6.1.tar.gz) = b1c12e8f4c261522858feea9c66b5c174b37203a73a54aac8e2bbfb3ab7b1933ba44c9c172aa9cf7a97dba0c4554d99042c042fef9b42f73e912f747ceac1d55
-SHA512 (pymapvbvd-test-data.tar.zst) = 638be0a8ad0e0876b13948d657bcf921e18938e964215c0c61b9deb6eb5f3abee449a0391238e8e60ffef55c4ca3b9c2906f4c4fd3655e23eed3567279e72323
+SHA512 (pyMapVBVD-0.5.7.tar.gz) = 0efd2d12ec48ae7f825095edf440d14064cf0f1690ab7dee63f247a923d359f633d057086a1d3defd2bd1606dbba0d1fabe2f6360f3658d04c78f347b61771ce
+SHA512 (pyMapVBVD-test-data.tar.xz) = e082c5c296c67d62dbfaa631a8507427ac74375902b2038bf5de58aed39f3ce71dd013318cb262d66bc3ab7bb0c560ea7228b52da09ed7361a0396b16e71b974