Unable to build sharp on node@9

We’ve enabled node@9 on our travis build and it failed while trying to install sharp:

https://travis-ci.org/piobyte/flamingo/jobs/295751049#L5352-L5409

relevant error log:

gyp info spawn /opt/pyenv/shims/python2
gyp info spawn args [ '/home/travis/.nvm/versions/node/v9.0.0/lib/node_modules/npm/node_modules/node-gyp/gyp/gyp_main.py',
gyp info spawn args   'binding.gyp',
gyp info spawn args   '-f',
gyp info spawn args   'make',
gyp info spawn args   '-I',
gyp info spawn args   '/home/travis/build/piobyte/flamingo/node_modules/sharp/build/config.gypi',
gyp info spawn args   '-I',
gyp info spawn args   '/home/travis/.nvm/versions/node/v9.0.0/lib/node_modules/npm/node_modules/node-gyp/addon.gypi',
gyp info spawn args   '-I',
gyp info spawn args   '/home/travis/.node-gyp/9.0.0/include/node/common.gypi',
gyp info spawn args   '-Dlibrary=shared_library',
gyp info spawn args   '-Dvisibility=default',
gyp info spawn args   '-Dnode_root_dir=/home/travis/.node-gyp/9.0.0',
gyp info spawn args   '-Dnode_gyp_dir=/home/travis/.nvm/versions/node/v9.0.0/lib/node_modules/npm/node_modules/node-gyp',
gyp info spawn args   '-Dnode_lib_file=/home/travis/.node-gyp/9.0.0/<(target_arch)/node.lib',
gyp info spawn args   '-Dmodule_root_dir=/home/travis/build/piobyte/flamingo/node_modules/sharp',
gyp info spawn args   '-Dnode_engine=v8',
gyp info spawn args   '--depth=.',
gyp info spawn args   '--no-parallel',
gyp info spawn args   '--generator-output',
gyp info spawn args   'build',
gyp info spawn args   '-Goutput_dir=.' ]
/home/travis/.nvm/versions/node/v9.0.0/bin/node[6641]: ../src/node_zlib.cc:430:static void node::{anonymous}::ZCtx::Init(const v8::FunctionCallbackInfo<v8::Value>&): Assertion `args.Length() == 7 && "init(windowBits, level, memLevel, strategy, writeResult, writeCallback," " dictionary)"' failed.
 1: node::Abort() [node]
 2: node::Assert(char const* const (*) [4]) [node]
 3: 0x1251ea1 [node]
 4: v8::internal::FunctionCallbackArguments::Call(void (*)(v8::FunctionCallbackInfo<v8::Value> const&)) [node]
 5: 0xb74c3c [node]
 6: v8::internal::Builtin_HandleApiCall(int, v8::internal::Object**, v8::internal::Isolate*) [node]
 7: 0x157404e842fd
Aborted (core dumped)
gyp: Call to 'node -e "require('./binding').download_vips()"' returned exit status 134 while in binding.gyp. while trying to load binding.gyp
gyp ERR! configure error 
gyp ERR! stack Error: `gyp` failed with exit code: 1
gyp ERR! stack     at ChildProcess.onCpExit (/home/travis/.nvm/versions/node/v9.0.0/lib/node_modules/npm/node_modules/node-gyp/lib/configure.js:336:16)
gyp ERR! stack     at emitTwo (events.js:135:13)
gyp ERR! stack     at ChildProcess.emit (events.js:224:7)
gyp ERR! stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:209:12)
gyp ERR! System Linux 4.4.0-93-generic
gyp ERR! command "/home/travis/.nvm/versions/node/v9.0.0/bin/node" "/home/travis/.nvm/versions/node/v9.0.0/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js" "rebuild"
gyp ERR! cwd /home/travis/build/piobyte/flamingo/node_modules/sharp
gyp ERR! node -v v9.0.0
gyp ERR! node-gyp -v v3.6.2
gyp ERR! not ok

[lovell]

The packaging scripts have been updated to include the Rust toolchain and the latest librsvg - see https://github.com/lovell/sharp-libvips/commit/d4d2019a7d9ed7a0adea036d19a4816de02c5da7 - so you can expect v0.19.0 within the next day or so.

[lovell]

@ram-you When libvips v8.6.0 is released the prebuilt binaries can be created and some final leak testing will be carried out. This issue is tagged as v0.19.0 so you will be alerted when it is published.