diff --git a/.gitignore b/.gitignore
index 2ec630f..6e4a9e6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,3 +7,6 @@ advancecomp-1.15.tar.gz
 /advancecomp-1.23.tar.gz
 /advancecomp-2.1.tar.gz
 /advancecomp-2.3.tar.gz
+/advancecomp-2.4.tar.gz
+/advancecomp-2.5.tar.gz
+/advancecomp-2.6.tar.gz
diff --git a/advancecomp.rpmlintrc b/advancecomp.rpmlintrc
new file mode 100644
index 0000000..483f617
--- /dev/null
+++ b/advancecomp.rpmlintrc
@@ -0,0 +1,6 @@
+# Spec file comment shows that exact version is unknown
+addFilter(r" unversioned-explicit-provides bundled\(7zip\)")
+# Not real spelling errors
+addFilter(r" spelling-error \('[Rr]ecompression',")
+addFilter(r" spelling-error \('([pm]ng|gz)',")
+addFilter(r" spelling-error \('adv(zip|[pm]ng|def)',")
diff --git a/advancecomp.spec b/advancecomp.spec
index 5610ada..97e6fca 100644
--- a/advancecomp.spec
+++ b/advancecomp.spec
@@ -1,5 +1,5 @@
 Name:           advancecomp
-Version:        2.3
+Version:        2.6
 Release:        %autorelease
 Summary:        Recompression utilities for .png, .mng, .zip and .gz files
 
@@ -14,15 +14,21 @@ Summary:        Recompression utilities for .png, .mng, .zip and .gz files
 #   of the sources that would be covered by the “unRAR license restriction” or
 #   the BSD-3-Clause license for LZFSE are present in this fork.
 #
-#   Certain build-system files, which do not contribute to the license of the
-#   binary RPM, are under other permissible licenses.
-#
 # However, in version 1.17, the COPYING file was updated to GPLv3, with a
 # changelog message (in HISTORY and elsewhere) of “Changes to GPL3.” We
 # interpret this as an overall license of GPL-3.0-only.
 License:        GPL-3.0-only AND GPL-2.0-or-later AND LGPL-2.1-or-later
+# Additionally, the following bundled libraries are removed in %%prep and do
+# not contribute to the licenses of the binary RPMs:
+#
+# Apache-2.0:
+#   - zopfli/
+# MIT:
+#   - libdeflate/
+SourceLicense:  %{license} AND Apache-2.0 AND MIT
 URL:            https://www.advancemame.it/
-Source0:        https://github.com/amadvance/advancecomp/archive/v%{version}/advancecomp-%{version}.tar.gz
+%global forgeurl https://github.com/amadvance/advancecomp
+Source:         %{forgeurl}/archive/v%{version}/advancecomp-%{version}.tar.gz
 
 BuildRequires:  autoconf
 BuildRequires:  automake
@@ -36,23 +42,13 @@ BuildRequires:  dos2unix
 # System library supported by upstream
 BuildRequires:  zlib-devel
 
-%if 0%{?el7}
-# No libdeflate package in EPEL7
-Provides:       bundled(libdeflate) = 0.6
-%else
 # Unbundled downstream
-BuildRequires:  pkgconfig(libdeflate)
-%endif
-
-%if 0%{?el9} || 0%{?el8} || 0%{?el7}
-# No libzopfli/zopfli-devel in these distributions
-# Version number based on HISTORY, which mentions that upstream commit
-# 6818a0859063b946094fb6f94732836404a0d89a was used from
-# https://github.com/google/zopfli/.
-Provides:       bundled(zopfli) = 1.0.2%{?!el7:^20160527git6818a08}
-%else
+BuildRequires:  pkgconfig(libdeflate) >= 1.19
 BuildRequires:  zopfli-devel
-%endif
+
+# The point of the 2.6 release was to upgrade the bundled libdeflate; enforce
+# this on the unbundled libdeflate.
+Requires:       libdeflate >= 1.19
 
 # From 7z/README:
 #
@@ -70,7 +66,7 @@ BuildRequires:  zopfli-devel
 # library, and because the implementation is modified, there is no possibility
 # of unbundling. Note that this was forked from the original 7-Zip, not from
 # p7zip.
-Provides:      bundled(7z)
+Provides:      bundled(7zip)
 
 %description
 AdvanceCOMP contains recompression utilities for your .zip archives,
@@ -88,12 +84,12 @@ This package contains:
 
 
 %prep
-%autosetup -p1
+%autosetup
+
 dos2unix -k doc/*.txt
 
-%if ! 0%{?el7}
 # Patch out bundled libdeflate
-rm -rvf libdeflate
+rm -rv libdeflate
 sed -r -i '/libdeflate[\/_]/d' Makefile.am
 # Fix up #include paths. The find-then-modify pattern keeps us from discarding
 # mtimes on any sources that do not need modification.
@@ -101,11 +97,9 @@ find . -type f -exec gawk \
     '/^[[:blank:]]*#include.*libdeflate/ { print FILENAME; nextfile }' \
     '{}' '+' |
   xargs -r -t sed -r -i 's@^([[:blank:]]*#include.*)libdeflate/@\1@'
-%endif
 
-%if !(0%{?el9} || 0%{?el8} || 0%{?el7})
 # Patch out bundled zopfli
-rm -rvf zopfli
+rm -rv zopfli
 sed -r -i \
     -e '/zopfli[\/_]/d' \
     -e 's/((\(7z_SOURCES\)|WindowOut\.h).*)[[:blank:]]*\\/\1/' \
@@ -116,24 +110,19 @@ find . -type f -exec gawk \
     '/^[[:blank:]]*#include.*zopfli/ { print FILENAME; nextfile }' \
     '{}' '+' |
   xargs -r -t sed -r -i -e 's@^([[:blank:]]*#include.*)zopfli/@\1@'
-%endif
 
 
 %build
 %set_build_flags
 autoreconf --force --install --verbose
 
-%if ! 0%{?el7}
 # Link against system libdeflate
 export CFLAGS="$(pkgconf --cflags libdeflate) ${CFLAGS-}"
 export CXXFLAGS="$(pkgconf --cflags libdeflate) ${CXXFLAGS-}"
 export LDFLAGS="$(pkgconf --libs libdeflate) ${LDFLAGS-}"
-%endif
 
-%if !(0%{?el9} || 0%{?el8} || 0%{?el7})
 # Link against system zopfli
 export LDFLAGS="-lzopfli ${LDFLAGS-}"
-%endif
 
 %configure
 %make_build
@@ -143,13 +132,20 @@ export LDFLAGS="-lzopfli ${LDFLAGS-}"
 %make_install
 
 
+# We don’t run upstream tests (%%make_build check) because they are too
+# brittle, expecting recompressed outputs to be identical. Across platforms,
+# compilers, and unbundled library versions, this doesn’t hold up.
+
+
 %files
 %license COPYING
-%doc AUTHORS HISTORY README
-%doc doc/adv*.txt
+%doc AUTHORS
+%doc HISTORY
+%doc README
+%doc doc/adv{def,mng,png,zip}.txt
 
-%{_bindir}/*
-%{_mandir}/man1/*
+%{_bindir}/adv{def,mng,png,zip}
+%{_mandir}/man1/adv{def,mng,png,zip}.1*
 
 
 %changelog
diff --git a/sources b/sources
index 59b074f..a8812ed 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (advancecomp-2.3.tar.gz) = 129bb820a044b03b94d9980c7fc675ee5c273ba8ba84f1fdd341c6b2d9847c3f379cc21e64bb75c0a3c5a45a3df9e560d92143728adb4e8834ae0525ff7d5d1c
+SHA512 (advancecomp-2.6.tar.gz) = 63cbb0578f96fd3f55ccb49e31bfe945649d36a11558aa482332440943d6d347f161de797b8d4469562b1d551b274c22fe08818179926d56aa4746581d3926dd