diff --git a/debian/.gitignore b/debian/.gitignore
new file mode 100644
index 00000000..cf56f2dd
--- /dev/null
+++ b/debian/.gitignore
@@ -0,0 +1,6 @@
+.debhelper/
+debhelper-build-stamp
+files
+libx11-compat/
+libx11-compat.debhelper.log
+libx11-compat.substvars
diff --git a/debian/changelog b/debian/changelog
new file mode 100644
index 00000000..8a1b938c
--- /dev/null
+++ b/debian/changelog
@@ -0,0 +1,5 @@
+libx11-compat (0.1.0) unstable; urgency=medium
+
+  * Initial packaging.
+
+ -- libx11-compat maintainers <libx11-compat@users.noreply.github.com>  Tue, 04 Aug 2026 17:00:00 +0000
diff --git a/debian/control b/debian/control
new file mode 100644
index 00000000..593afd2b
--- /dev/null
+++ b/debian/control
@@ -0,0 +1,30 @@
+Source: libx11-compat
+Section: libs
+Priority: optional
+Maintainer: libx11-compat maintainers <libx11-compat@users.noreply.github.com>
+Build-Depends: debhelper-compat (= 13),
+               pkgconf,
+               python3,
+               libsdl2-dev,
+               libsdl2-ttf-dev,
+               libpixman-1-dev
+Standards-Version: 4.6.2
+Homepage: https://github.com/sysprog21/libx11-compat
+Vcs-Git: https://github.com/sysprog21/libx11-compat.git
+Vcs-Browser: https://github.com/sysprog21/libx11-compat
+Rules-Requires-Root: no
+
+Package: libx11-compat
+Architecture: any
+Depends: ${shlibs:Depends}, ${misc:Depends}
+Description: in-process Xlib implementation layered on SDL
+ libx11-compat is an in-process implementation of the X Window System
+ client library (Xlib) layered on top of SDL (SDL2 or SDL3), SDL_ttf,
+ and pixman. It lets existing Xlib clients keep their source unchanged
+ while running on platforms where a conventional X server is
+ unavailable or inconvenient: Wayland-only sessions, headless CI, and
+ similar environments.
+ .
+ This package ships the compat shared libraries (libX11-compat.so and
+ friends) with standard-name aliases plus the public X11 API headers,
+ so a downstream build can link against the shim as an ordinary X11.
diff --git a/debian/copyright b/debian/copyright
new file mode 100644
index 00000000..9fe12436
--- /dev/null
+++ b/debian/copyright
@@ -0,0 +1,27 @@
+Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
+Upstream-Name: libx11-compat
+Source: https://github.com/sysprog21/libx11-compat
+
+Files: *
+Copyright: 2016-2019, 2022 Sebastian Scholz
+           2026 National Cheng Kung University, Taiwan
+License: MIT
+
+License: MIT
+ Permission is hereby granted, free of charge, to any person obtaining a copy
+ of this software and associated documentation files (the "Software"), to deal
+ in the Software without restriction, including without limitation the rights
+ to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ copies of the Software, and to permit persons to whom the Software is
+ furnished to do so, subject to the following conditions:
+ .
+ The above copyright notice and this permission notice shall be included in
+ all copies or substantial portions of the Software.
+ .
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ THE SOFTWARE.
diff --git a/debian/rules b/debian/rules
new file mode 100755
index 00000000..e5fadbd5
--- /dev/null
+++ b/debian/rules
@@ -0,0 +1,29 @@
+#!/usr/bin/make -f
+# Note: the build stages pinned upstream Xorg headers via
+# scripts/sync-upstream-headers.py, which downloads sha256-pinned
+# tarballs. For an offline build, place those tarballs in a directory
+# outside the source tree (the clean target wipes the in-tree cache)
+# and export LIBX11_COMPAT_TARBALL_DIR pointing at it; the script then
+# seeds from that directory instead of the network.
+
+export DEB_BUILD_MAINT_OPTIONS = hardening=+all
+
+%:
+	dh $@
+
+
+# Install into a private prefix: the shipped headers (X11/, GL/, ...)
+# and libX11.so aliases would otherwise clash with the real X11 dev
+# packages. Downstreams point their build at this tree, e.g.
+# ./configure --with-libx11-compat=/usr/lib/libx11-compat
+override_dh_auto_install:
+	dh_auto_install -- PREFIX=/usr/lib/libx11-compat
+
+override_dh_auto_test:
+	# The full check suite needs a display and optional workloads;
+	# skip it during package builds.
+
+# The compat libraries deliberately carry unversioned sonames
+# (libX11-compat.so, ...); skip symbols/shlibs generation.
+override_dh_makeshlibs:
+	dh_makeshlibs -n
diff --git a/debian/source/format b/debian/source/format
new file mode 100644
index 00000000..89ae9db8
--- /dev/null
+++ b/debian/source/format
@@ -0,0 +1 @@
+3.0 (native)
diff --git a/packaging/README.md b/packaging/README.md
new file mode 100644
index 00000000..cbedf467
--- /dev/null
+++ b/packaging/README.md
@@ -0,0 +1,52 @@
+# Packaging recipes
+
+Distribution packaging recipes for libx11-compat. Each recipe builds the
+compat shared libraries with standard-name aliases plus the public X11
+API headers via `make install` (see `mk/install.mk`), into the private
+prefix `/usr/lib/libx11-compat` (`%{_libdir}/libx11-compat` on RPM
+distros): the shipped headers (`X11/`, `GL/`, ...) and `libX11.so`
+aliases would clash with the real X11 dev packages under `/usr`.
+Downstreams point their build at this tree, e.g.
+`./configure --with-libx11-compat=/usr/lib/libx11-compat`.
+
+Note for all recipes: the build stages pinned upstream Xorg headers via
+`scripts/sync-upstream-headers.py`, which downloads sha256-pinned
+tarballs. For offline builds (sbuild, mock/koji, or a clean chroot
+without network), the script seeds those tarballs from the directory
+named by `LIBX11_COMPAT_TARBALL_DIR` instead of the network, verifying
+the pinned sha256 either way. The RPM spec declares the tarballs as
+`Source1:`..`Source6:` and points the variable at `%{_sourcedir}`; the
+PKGBUILD lists them in `source=()` (checksummed by makepkg) and points
+the variable at `$srcdir`; for Debian, place the tarballs in a directory
+outside the source tree (the clean target wipes the in-tree cache) and
+export the variable before a direct `dpkg-buildpackage`. Under sbuild
+the build runs in a clean chroot where the caller's environment does
+not reach the inner make, so inject both the tarballs and the variable
+into the chroot explicitly (e.g. copy the tarballs in with
+`--chroot-setup-commands` or a bind mount, and pass the variable via
+`$build_environment` in `.sbuildrc`).
+
+## Debian / Ubuntu / Pardus (`../debian/`)
+
+debhelper-13 packaging at the repository root. Build with:
+
+```sh
+dpkg-buildpackage -us -uc -b
+```
+
+The changelog targets `unstable`; retarget the distribution field when
+uploading to a specific distro.
+
+## RPM (Fedora / RHEL / openSUSE) (`rpm/libx11-compat.spec`)
+
+```sh
+rpmbuild -ba packaging/rpm/libx11-compat.spec
+```
+
+## Arch Linux (AUR) (`aur/PKGBUILD`)
+
+A `-git` package tracking the main branch:
+
+```sh
+cd packaging/aur && makepkg -si
+```
diff --git a/packaging/aur/PKGBUILD b/packaging/aur/PKGBUILD
new file mode 100644
index 00000000..0e9c7ae7
--- /dev/null
+++ b/packaging/aur/PKGBUILD
@@ -0,0 +1,58 @@
+# Maintainer: libx11-compat maintainers <libx11-compat@users.noreply.github.com>
+pkgname=libx11-compat-git
+pkgver=r1.0000000
+pkgrel=1
+pkgdesc="In-process Xlib implementation layered on SDL (SDL2/SDL3), SDL_ttf, and pixman"
+arch=('x86_64' 'aarch64')
+url="https://github.com/sysprog21/libx11-compat"
+license=('MIT')
+depends=('sdl2' 'sdl2_ttf' 'pixman')
+makedepends=('git' 'python' 'pkgconf')
+provides=('libx11-compat')
+conflicts=('libx11-compat')
+# The pinned upstream Xorg tarballs the build stages headers/sources
+# from are declared as sources so makepkg downloads and checksums them;
+# scripts/sync-upstream-headers.py seeds them from $srcdir via
+# LIBX11_COMPAT_TARBALL_DIR (re-verifying the pinned sha256) instead of
+# fetching over the network mid-build.
+source=("libx11-compat::git+$url.git"
+        'https://xorg.freedesktop.org/archive/individual/lib/libX11-1.8.13.tar.xz'
+        'https://xorg.freedesktop.org/archive/individual/proto/xorgproto-2025.1.tar.xz'
+        'https://xorg.freedesktop.org/archive/individual/lib/libXt-1.3.1.tar.xz'
+        'https://xorg.freedesktop.org/archive/individual/lib/libXpm-3.5.19.tar.xz'
+        'https://xorg.freedesktop.org/archive/individual/lib/libXmu-1.3.1.tar.xz'
+        'https://xorg.freedesktop.org/archive/individual/lib/libXaw-1.0.16.tar.xz')
+noextract=('libX11-1.8.13.tar.xz'
+           'xorgproto-2025.1.tar.xz'
+           'libXt-1.3.1.tar.xz'
+           'libXpm-3.5.19.tar.xz'
+           'libXmu-1.3.1.tar.xz'
+           'libXaw-1.0.16.tar.xz')
+sha256sums=('SKIP'
+            '69606f485c2c07c14ef64f75b7bb326d48587af33795d9ab3e607c0b5f94f11c'
+            '56898c716c0578df8a2d828c9c3e5c528277705c0484381a81960fe1a67668e8'
+            'e0a774b33324f4d4c05b199ea45050f87206586d81655f8bef4dba434d931288'
+            'ad3576d689221a39dc728f0e0dc02ca7bb6a0d724c9a77fd1bfa1e9af83be900'
+            '81a99e94c4501e81c427cbaa4a11748b584933e94b7a156830c3621256857bc4'
+            '731d572b54c708f81e197a6afa8016918e2e06dfd3025e066ca642a5b8c39c8f')
+
+pkgver() {
+  cd libx11-compat
+  printf "r%s.%s" "$(git rev-list --count HEAD)" "$(git rev-parse --short HEAD)"
+}
+
+build() {
+  cd libx11-compat
+  LIBX11_COMPAT_TARBALL_DIR="$srcdir" make
+}
+
+package() {
+  cd libx11-compat
+  # Install into a private prefix: the shipped headers (X11/, GL/, ...)
+  # and libX11.so aliases would otherwise clash with the real X11 dev
+  # packages. Downstreams point their build at this tree, e.g.
+  # ./configure --with-libx11-compat=/usr/lib/libx11-compat
+  make install PREFIX=/usr/lib/libx11-compat DESTDIR="$pkgdir"
+  install -Dm644 LICENSE "$pkgdir/usr/share/licenses/$pkgname/LICENSE"
+  install -Dm644 README.md "$pkgdir/usr/share/doc/$pkgname/README.md"
+}
diff --git a/packaging/rpm/libx11-compat.spec b/packaging/rpm/libx11-compat.spec
new file mode 100644
index 00000000..bf30b009
--- /dev/null
+++ b/packaging/rpm/libx11-compat.spec
@@ -0,0 +1,70 @@
+# Pin the source to a fixed commit so the NEVRA always maps to the same
+# code; bump %%commit (and Version/Release) when updating the package.
+%global commit 93e0505ce8880115187b32d80d25535f1cc66fe2
+%global shortcommit %(c=%{commit}; echo ${c:0:7})
+
+# Install into a private prefix: the shipped headers (X11/, GL/, ...)
+# and libX11.so aliases would otherwise clash with the real X11 dev
+# packages. Downstreams point their build at this tree, e.g.
+# ./configure --with-libx11-compat=%%{_libdir}/libx11-compat
+%global compat_prefix %{_libdir}/libx11-compat
+
+Name:           libx11-compat
+Version:        0.1.0
+Release:        1.20260804git%{shortcommit}%{?dist}
+Summary:        In-process Xlib implementation layered on SDL
+
+License:        MIT
+URL:            https://github.com/sysprog21/libx11-compat
+Source0:        %{url}/archive/%{commit}/%{name}-%{shortcommit}.tar.gz
+# Pinned upstream Xorg tarballs the build stages headers/sources from
+# (see scripts/sync-upstream-headers.py, which verifies their sha256).
+# Declaring them as sources keeps the build fully offline in mock/koji.
+Source1:        https://xorg.freedesktop.org/archive/individual/lib/libX11-1.8.13.tar.xz
+Source2:        https://xorg.freedesktop.org/archive/individual/proto/xorgproto-2025.1.tar.xz
+Source3:        https://xorg.freedesktop.org/archive/individual/lib/libXt-1.3.1.tar.xz
+Source4:        https://xorg.freedesktop.org/archive/individual/lib/libXpm-3.5.19.tar.xz
+Source5:        https://xorg.freedesktop.org/archive/individual/lib/libXmu-1.3.1.tar.xz
+Source6:        https://xorg.freedesktop.org/archive/individual/lib/libXaw-1.0.16.tar.xz
+
+BuildRequires:  gcc
+BuildRequires:  make
+BuildRequires:  pkgconfig
+BuildRequires:  python3
+BuildRequires:  pkgconfig(sdl2)
+BuildRequires:  pkgconfig(SDL2_ttf)
+BuildRequires:  pkgconfig(pixman-1)
+
+%description
+libx11-compat is an in-process implementation of the X Window System
+client library (Xlib) layered on top of SDL (SDL2 or SDL3), SDL_ttf,
+and pixman. It lets existing Xlib clients keep their source unchanged
+while running on platforms where a conventional X server is
+unavailable or inconvenient: Wayland-only sessions, headless CI, and
+similar environments.
+
+This package ships the compat shared libraries (libX11-compat.so and
+friends) with standard-name aliases plus the public X11 API headers,
+so a downstream build can link against the shim as an ordinary X11.
+
+%prep
+%autosetup -n %{name}-%{commit}
+
+# The staging script seeds the pinned upstream tarballs from
+# LIBX11_COMPAT_TARBALL_DIR (sha256-verified) instead of the network,
+# so the build works in an offline mock/koji chroot.
+%build
+export LIBX11_COMPAT_TARBALL_DIR=%{_sourcedir}
+%make_build
+
+%install
+%make_install PREFIX=%{compat_prefix}
+
+%files
+%license LICENSE
+%doc README.md
+%{compat_prefix}/
+
+%changelog
+* Tue Aug 04 2026 libx11-compat maintainers <libx11-compat@users.noreply.github.com> - 0.1.0-1.20260804git93e0505
+- Initial packaging.
diff --git a/scripts/sync-upstream-headers.py b/scripts/sync-upstream-headers.py
index 77dcb953..e4b49c82 100644
--- a/scripts/sync-upstream-headers.py
+++ b/scripts/sync-upstream-headers.py
@@ -12,7 +12,10 @@
 ``fetch DEST [--force]``
     Download (cached) tarballs and extract headers into ``DEST/X11/`` and
     the whitelisted libX11 ``src/`` files into ``DEST/../src/``. Idempotent
-    through ``DEST/.upstream-stamp``.
+    through ``DEST/.upstream-stamp``. For offline builds, set
+    ``LIBX11_COMPAT_TARBALL_DIR`` to a directory holding the pinned
+    tarballs; entries whose sha256 matches the pin are used instead of
+    downloading.
 
 ``diff``
     Compare local ``include/X11/`` to upstream and classify each path as
@@ -478,6 +481,23 @@ def download(url: str, expected_sha: str) -> Path:
                 file=sys.stderr,
             )
             dest.unlink(missing_ok=True)
+    # Offline builds (distro packaging, network-restricted chroots) can drop
+    # the pinned tarballs into a directory and point this variable at it; a
+    # tarball whose sha256 matches the pin is used instead of the network.
+    # The cache under build/ does not survive `make distclean`, so the seed
+    # directory should live outside the build tree.
+    seed_dir = os.environ.get("LIBX11_COMPAT_TARBALL_DIR")
+    if seed_dir:
+        candidate = Path(seed_dir) / dest.name
+        if candidate.is_file():
+            if sha256_of(candidate) == expected_sha:
+                print(f"  SEED    {candidate}", file=sys.stderr)
+                shutil.copyfile(candidate, dest)
+                return dest
+            print(
+                f"  WARN    seed {candidate} has unexpected sha256; ignoring",
+                file=sys.stderr,
+            )
     print(f"  FETCH   {url}", file=sys.stderr)
     tmp_fd, tmp_name = tempfile.mkstemp(dir=CACHE_DIR, prefix=".dl-")
     os.close(tmp_fd)
@@ -509,8 +529,8 @@ def download(url: str, expected_sha: str) -> Path:
         if last_exc is not None:
             raise SystemExit(
                 f"failed to download {url} after {attempts} attempts: {last_exc}\n"
-                f"  pre-seed the cache at {CACHE_DIR}/{dest.name} "
-                f"to build offline"
+                f"  to build offline, place {dest.name} in a directory and\n"
+                f"  set LIBX11_COMPAT_TARBALL_DIR to that directory"
             ) from last_exc
         actual = sha256_of(tmp_path)
         if actual != expected_sha:
diff --git a/src/wrapper/sdl-ttf-wrapper.c b/src/wrapper/sdl-ttf-wrapper.c
index 9cae2119..2f9d1693 100644
--- a/src/wrapper/sdl-ttf-wrapper.c
+++ b/src/wrapper/sdl-ttf-wrapper.c
@@ -57,20 +57,9 @@ TTF_WRAP(char *, TTF_FontFaceFamilyName, (const TTF_Font *font), (font))
 TTF_WRAP(int, TTF_FontFaceIsFixedWidth, (const TTF_Font *font), (font))
 TTF_WRAP(const char *, TTF_GetError, (void), ())
 TTF_WRAP(int, TTF_GetFontStyle, (const TTF_Font *font), (font))
-#if SDL_TTF_VERSION_ATLEAST(2, 20, 0)
 TTF_WRAP(int, TTF_GlyphIsProvided, (TTF_Font * font, Uint16 ch), (font, ch))
-TTF_WRAP(int, TTF_GlyphIsProvided32, (TTF_Font * font, Uint32 ch), (font, ch))
-#else
-TTF_WRAP(int,
-         TTF_GlyphIsProvided,
-         (const TTF_Font *font, Uint16 ch),
-         (font, ch))
 #if SDL_TTF_VERSION_ATLEAST(2, 0, 18)
-TTF_WRAP(int,
-         TTF_GlyphIsProvided32,
-         (const TTF_Font *font, Uint32 ch),
-         (font, ch))
-#endif
+TTF_WRAP(int, TTF_GlyphIsProvided32, (TTF_Font * font, Uint32 ch), (font, ch))
 #endif
 TTF_WRAP(int,
          TTF_GlyphMetrics,