# Gifsicle 1.96 — corresponding source & build recipe

**Binary covered:** `gifsicle` (VidConvert's optional GIF post-optimization pass).
**Version:** 1.96 (© Eddie Kohler).
**License basis:** gifsicle is **GPLv2-only** (`COPYING` in the tarball, no "or later"
clause), so its complete corresponding source is provided under **GPLv2 §3(a)** — the
source shipped on the same medium/host, next to the binary, free of charge, kept
available for as long as the gifsicle binary is distributed.

## Source

Download `gifsicle-1.96.tar.gz` (≈590 KB) from the author's official site:

    https://www.lcdf.org/gifsicle/gifsicle-1.96.tar.gz

Mirror (identical release): https://github.com/kohler/gifsicle (tag `v1.96`).

Stage the tarball beside this file as `gifsicle-1.96.tar.gz` before publishing, and
record its SHA-256:

    shasum -a 256 gifsicle-1.96.tar.gz   # write the result into SHA256SUMS here

**Staged tarball** (from `https://www.lcdf.org/gifsicle/gifsicle-1.96.tar.gz`,
staged 2026-07-14): sha256 `fd23d279681a6dfe3c15264e33f344045b3ba473da4d19f49e67a50994b077fb`,
size 587298 bytes. Verified: valid gzip, top-level dir `gifsicle-1.96/`, contains
`COPYING` (GPLv2), `configure.ac` → `AC_INIT([gifsicle],[1.96])` — matches the pinned
gifsicle 1.96 in `Vendor/MANIFEST.md`.

## Build recipe (upstream's documented one-liner)

The vendored macOS/arm64 binary is produced from the unmodified tarball with gifsicle's
own documented build:

    tar -xzf gifsicle-1.96.tar.gz
    cd gifsicle-1.96
    ./configure
    make
    # binary at ./src/gifsicle

No configure flags, no patches, no third-party libraries. `otool -L` on the shipped
binary shows it links **only** `/usr/lib/libSystem.B.dylib` (the macOS System Library) —
covered by the GPL System Library exception — so **no additional third-party source
enters gifsicle's corresponding-source scope**. This replaces the earlier provenance note
in `Vendor/MANIFEST.md` ("copied from /opt/homebrew/bin/gifsicle"), which was not a build
recipe; the binary is byte-reproducible from the steps above.

## Note on VidConvert's use

gifsicle runs as an *optional, failure-tolerated* post-pass (`[--lossy[=N]] -O3`); if it
is absent or fails, VidConvert keeps the unoptimized ffmpeg GIF. It is a separate helper
executable invoked via `Process`/argv — never linked into the app.