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+# megasync-bin SlackBuild — Design
+
+Date: 2026-07-06
+Package: `megasync-bin`
+Target: personal SBo-compatible repo (not SBo submission — binary repack)
+Arch: x86_64 only (upstream ships no 32-bit)
+
+## Goal
+
+Package MEGA's official desktop client (MEGAsync) for Slackware by repacking
+the upstream prebuilt Debian package, plus the dolphin and thunar file-manager
+integration plugins, into a single Slackware package.
+
+Building from source is impractical: upstream uses CMake + Qt5.15 + a MEGA SDK
+git submodule + Microsoft vcpkg, which fetches and compiles ~30 deps at build
+time (network-heavy, offline-illegal, hours-long Qt/C++ compile). MEGA ships
+prebuilt binaries for deb/rpm distros; the binary links against system Qt5 and
+bundles its own ffmpeg, so it drops cleanly onto stock Slackware.
+
+## Naming
+
+- `PRGNAM=megasync-bin` — avoids clash with the old SBo source `megasync`
+  (SBo still has 4.5.3.0, last touched 2021). The `-bin` suffix follows the
+  repo's existing pattern (claude-code-bin, kitty-bin, opencode-bin).
+- Installed binary stays `/usr/bin/megasync` (upstream name preserved).
+
+## Source
+
+Versionless Debian 13 URLs (always serve latest; MD5SUM drifts by design,
+re-checksum on nvchecker alert):
+
+```
+https://mega.nz/linux/repo/Debian_13/amd64/megasync-Debian_13_amd64.deb
+https://mega.nz/linux/repo/Debian_13/amd64/dolphin-megasync-Debian_13_amd64.deb
+https://mega.nz/linux/repo/Debian_13/amd64/thunar-megasync-Debian_13_amd64.deb
+```
+
+`.info` DOWNLOAD lists all three (space/backslash-separated), with three
+matching MD5SUM entries in the same order. Current checksums:
+
+```
+megasync-Debian_13_amd64.deb          c2f596ea2043da9613104a47934957d8
+dolphin-megasync-Debian_13_amd64.deb  0917cb242b0f388f1ab01f6d44b76891
+thunar-megasync-Debian_13_amd64.deb   5270041c4b5b23990d522390fafa551e
+```
+
+VERSION = `6.4.0.2` (upstream release tag `v6.4.0.2_Linux`; the repo package
+metadata calls it 6.4.0, the integration plugins lag at 6.2.0 — VERSION tracks
+the main app).
+
+## Dependencies
+
+`REQUIRES=""`. Verified on stock Slackware (this machine, Qt5 5.15.19):
+
+- Main binary: links system Qt5 (Core/Widgets/Quick/Gui/Qml/Network/Svg/DBus/
+  QuickWidgets/X11Extras), libxcb; bundles ffmpeg in `/opt/megasync/lib`
+  (RUNPATH). All QtQuick QML runtime modules present. `ldd` fully resolves.
+- dolphin plugin: needs KF5 (libKF5ConfigCore/CoreAddons/KIOCore/KIOWidgets/
+  WidgetsAddons) — present in stock Slackware. Loads only when dolphin runs.
+- thunar plugin: needs thunarx-3 + glib — present in stock Slackware. Loads
+  only when Thunar runs.
+
+Plugins for an absent file manager are dead `.so` files: harmless, unused,
+never loaded by megasync itself. So bundling all three in one package is safe
+regardless of which file managers the user has installed.
+
+## Package layout (from main deb, paths as-is unless noted)
+
+```
+/usr/bin/megasync
+/usr/bin/mega-desktop-app-gfxworker
+/opt/megasync/lib/libav*.so.*  libsw*.so.*      # bundled ffmpeg, keep RUNPATH
+/usr/share/megasync/resources/*.rcc
+/usr/share/applications/megasync.desktop         # upstream ships it
+/usr/share/icons/hicolor/**/apps/mega.png
+/usr/share/icons/hicolor/scalable/status/*.svg
+/usr/share/icons/ubuntu-mono-dark/status/24/*.svg
+/etc/sysctl.d/99-megasync-inotify-limit.conf     # ship as .new
+/etc/udev/rules.d/99-megasync-udev.rules         # ship as .new
+```
+
+Integration plugins — remap Debian multiarch libdir to Slackware `/usr/lib64`:
+
+```
+dolphin:
+  /usr/lib/x86_64-linux-gnu/qt5/plugins/kf5/overlayicon/megasync-overlay-plugin.so
+  /usr/lib/x86_64-linux-gnu/qt5/plugins/kf5/kfileitemaction/megasync-plugin.so
+    -> /usr/lib64/qt5/plugins/kf5/...
+  /usr/share/icons/hicolor/**/emblems/mega-dolphin-*.png
+thunar:
+  /usr/lib/x86_64-linux-gnu/thunarx-3/libMEGAShellExtThunar.so
+    -> /usr/lib64/thunarx-3/libMEGAShellExtThunar.so
+```
+
+## SlackBuild flow
+
+1. Standard SBo header: set `PRGNAM=megasync-bin`, `SRCNAM=megasync`,
+   `VERSION`, `ARCH`/`SLKCFLAGS`/`LIBDIRSUFFIX` detection (x86_64 only —
+   `exit 1` on other arch).
+2. Extract each of the three debs: `ar x <deb>` then `tar xf data.tar.*`
+   into `$PKG` (or a staging dir then copy). Debs have no versioned top dir.
+3. Relocate integration plugin `.so` files from
+   `usr/lib/x86_64-linux-gnu/` to `usr/lib${LIBDIRSUFFIX}/`.
+4. Rename the two `/etc` config files to `.new`.
+5. Strip binaries and bundled libs (upstream does not discourage it).
+   Preserve the `/opt/megasync/lib` RUNPATH on the main binary.
+6. Install docs to `/usr/doc/$PRGNAM-$VERSION/` (README, plus upstream
+   copyright). Drop the Debian `changelog.Debian.gz` and `copyright`
+   from `/usr/share/doc/megasync`.
+7. `slack-desc` (11-line), `$PKG/install/slack-desc`.
+8. `find -L . ... chown/chmod` cleanup block.
+9. `makepkg -l y -c n`.
+
+## Repo integration
+
+- `nvchecker.toml`: track the GitHub release tag.
+  Tags look like `v6.4.0.2_Linux`; strip the `v` prefix and `_Linux`
+  suffix to get `6.4.0.2` with a regex transform:
+  ```toml
+  [megasync-bin]
+  source = "github"
+  github = "meganz/MEGAsync"
+  use_max_tag = true
+  prefix = "v"
+  from_pattern = '_Linux$'
+  to_pattern = ''
+  ```
+  (Verify against `nvchecker` output when wiring it up; adjust the pattern
+  if upstream tag format differs.)
+- README version table: add a `megasync-bin` row.
+
+## Testing
+
+1. `sbolint` clean.
+2. `sbodl` verifies all three MD5SUMs (will pass only until MEGA rebuilds).
+3. Build with the SlackBuild; `sbopkglint` clean.
+4. Install; run `megasync --version` / launch; confirm binary resolves
+   (`ldd`), tray app starts.
+5. Confirmed against -current (VM) and 15.0 as usual.
+
+## Known gotchas
+
+- Versionless download URL means MD5SUM goes stale on every upstream
+  rebuild, not just version bumps. Expected for this `-bin`; re-checksum
+  when nvchecker flags a new tag.
+- Integration plugins version-lag (6.2.0) behind the main app (6.4.0) in
+  upstream's repo; nothing we control.
+- Not SBo-submittable (binary repack + versionless rolling source).