In 2026, many OpenClaw operators still reach fornpm install -gfirst—and then watch the terminal freeze onsharp, a native image stack that compiles against libvips. On lab laptops the problem hides behind cached binaries; on freshMac mini M4cloud hosts inSingapore, Tokyo, Seoul, Hong Kong, US East, or US West, it becomes your onboarding gate. This page explains when to lean onSHARP_IGNORE_GLOBAL_LIBVIPS, how to choose between upstreaminstall.sh,install-cli.sh, and an npm prefix spine without mixing them, and how to close the loop with a singleopenclaw doctoracceptance sheet before you scale gateways across regions.
1. Why npm global appears to “hang” on sharp
sharpships prebuilt binaries for common macOS and Node combinations, but the postinstall step still has to pick a strategy: download a matching tarball, or compile from source. The slow path appears whennetwork egress is throttled, when the detected ABI does not match any published asset, or when aHomebrew libvipsinstall on the host makes sharp prefer linking against system headers—triggering a long compile. On unattended SSH sessions you only see silence until either success or a wall of compiler errors. Treat “stuck” as “busy”: inspect CPU withtop, confirm outbound HTTPS is allowed, and keep logs withnpm_config_loglevel=verboseso your automation can fail fast instead of timing out blindly.
On Apple Silicon cloud Macs, also watch for accidentalx86_64 Nodeunder Rosetta: sharp’s prebuild selector keys off architecture, so alignnode -p process.archwith your golden image before you blame sharp. If proxies rewrite TLS, fix trust bundles early—otherwise downloads retry until your pipeline timeout fires.
2. SHARP_IGNORE_GLOBAL_LIBVIPS: when it saves the day
If operators previously ranbrew install vipson a shared image, sharp may try to bind against that tree. SettingSHARP_IGNORE_GLOBAL_LIBVIPS=1for the install window tells sharp toignore the globally detected libvipsand fall back to its vendored route—often the difference between minutes of compilation and a quick unpack. Export it in the same shell profile your CI user loads for non-interactive SSH, not only in an interactive zsh session. After the install completes, document whether you keep the variable for runtime as well; some teams unset it once the correct binary is on disk to avoid masking future packaging bugs.
3. install.sh vs install-cli.sh vs npm prefix: pick one spine
The upstream project typically offers a fullinstall.shthat lays down the supported layout and a slimmerinstall-cli.shwhen you only need the CLI on an already curated host. Both are attractive when npm globals fight your security baselines. Conversely, an explicit npm global under adedicated prefixowned by the service user keeps upgrades inside your existing semver policy. The anti-pattern isdouble routing: half the fleet installed via script into/usr/local, the other half vianpm prefix=$HOME/.openclaw-npm, with launchd inheriting whichever PATH was narrower during bootstrap. Pick one channel per cohort, codify it in Terraform or your golden image, and never “just npm on this one host” during an incident. For the broader install-vs-npm decision matrix and daemon onboarding, pair this note withLearn more: headless install, onboard daemon, and doctor-led triage.
4. Six metros, one frozen posture
When you run parallel gateways acrossSingapore, Tokyo, Seoul, Hong Kong, US East, and US West, sharp issues become regional noise unless every VM or bare-metal slice shares the same compiler toolchain, Xcode CLT presence, and brew footprint. Bake sharp-friendly defaults into asingle golden imageper tier (for example Mac mini M4 16GB/256 versus 24GB/512), snapshot it, and promote changes as a unit. Operators sitting in Tokyo should not chase a different sharp flag than the cohort in Virginia. If you are still sizing how long a PoC should rent hardware before committing, useLearn more: six-region PoC provisioning and phased rental FAQto align disk and RAM bumps with real compile concurrency.
5. openclaw doctor: one-page acceptance FAQ
After sharp finishes, your real gate is whether the gateway binaries, config paths, and network checks agree. Runopenclaw doctorimmediately and capture stdout with the npm log bundle—redact tokens, includeuname -aandnode -v, and fix TLS or clock skew before re-running npm so you do not oscillate between “sharp works” and “gateway cannot pair.”
Use the checklist below as the FAQ you attach to the change ticket.
- Q: Doctor says healthy but the daemon never binds?Compare the PATH inside launchd with your SSH shell; reinstall using the same spine you documented.
- Q: sharp installed yet thumbnails still fail?Confirm the runtime user can read the cache directory and that Rosetta is not accidentally mixed into an arm64-only Node.
- Q: Only one region shows elevated sharp rebuilds?Diff brew manifests and CLT versions before blaming the network—regional mirrors should not diverge if images are frozen.
- Q: Should SHARP_IGNORE_GLOBAL_LIBVIPS stay forever?Unset after you remove stray brew vips, unless policy requires ignoring globals indefinitely.
All of this is easier on dedicated cloud Mac mini
Sharp headaches are worst onmutable shared imageswhere every engineer leaves a different brew trail. vpszap gives youphysical Mac mini M4hosts—not virtualized slices—with predictable disks, aboutfive-minute activation, andSSH plus VNCtogether so you can watch a GUI installer when policy demands it. Billing runs by theday, week, month, or quarterwithno long-term contract, and six global metros let you place gateways next to operators or upstream APIs without improvising per region.
If you want the lowest-friction place to freeze an OpenClaw-friendly image before production traffic,vpszap cloud Mac miniis the closest match to owning racks without owning racks.
