npm install sharp
(sharp@0.16.1)

node -v v6.8.0
node-gyp -v v3.4.0

/bin/sh: readelf: command not found
gyp: Call to 'if readelf -Ws "$(PKG_CONFIG_PATH="/usr/lib/pkgconfig:/usr/local/Homebrew/Library/Homebrew/os/mac/pkgconfig/10.11:$PKG_CONFIG_PATH:/usr/local/lib/pkgconfig:/usr/lib/pkgconfig" pkg-config --libs-only-L vips-cpp | cut -c 3- | sed -e "s/^$//usr/lib/")/libvips-cpp.so" | c++filt | grep -qF __cxx11;then echo "1";else echo "0";fi' returned exit status 0 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 (/usr/local/lib/node_modules/npm/node_modules/node-gyp/lib/configure.js:305:16)
gyp ERR! stack at emitTwo (events.js:106:13)
gyp ERR! stack at ChildProcess.emit (events.js:191:7)
gyp ERR! stack at Process.ChildProcess._handle.onexit (internal/child_process.js:215:12)
gyp ERR! System Darwin 15.6.0
gyp ERR! command "/usr/local/bin/node" "/usr/local/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js" "rebuild"