hi I am getting this error when i am installing parse server example npm install

[Mohamed Elmi Hassan]

node-pre-gyp ERR! Tried to download(404): https://github.com/kelektiv/node.bcrypt.js/releases/download/v1.0.2/bcrypt_lib-v1.0.2-node-v51-linux-x64.tar.gz
node-pre-gyp ERR! Pre-built binaries not found for bcrypt@1.0.2 and node@7.6.0 (node-v51 ABI) (falling back to source compile with node-gyp)
gyp WARN EACCES user "root" does not have permission to access the dev dir "/root/.node-gyp/7.6.0"
gyp WARN EACCES attempting to reinstall using temporary dev dir "/opt/parse-server-example/node_modules/bcrypt/.node-gyp"
gyp ERR! build error
gyp ERR! stack Error: not found: make
gyp ERR! stack at getNotFoundError (/usr/lib/node_modules/npm/node_modules/which/which.js:13:12)
gyp ERR! stack at F (/usr/lib/node_modules/npm/node_modules/which/which.js:68:19)
gyp ERR! stack at E (/usr/lib/node_modules/npm/node_modules/which/which.js:80:29)
gyp ERR! stack at /usr/lib/node_modules/npm/node_modules/which/which.js:89:16
gyp ERR! stack at /usr/lib/node_modules/npm/node_modules/which/node_modules/isexe/index.js:44:5
gyp ERR! stack at /usr/lib/node_modules/npm/node_modules/which/node_modules/isexe/access.js:8:5
gyp ERR! stack at FSReqWrap.oncomplete (fs.js:114:15)
gyp ERR! System Linux 4.4.0-64-generic
gyp ERR! command "/usr/bin/nodejs" "/usr/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js" "build" "--fallback-to-build" "--module=/opt/parse-server-example/node_modules/bcrypt/lib/binding/bcrypt_lib.node" "--module_name=bcrypt_lib" "--module_path=/opt/parse-server-example/node_modules/bcrypt/lib/binding"
gyp ERR! cwd /opt/parse-server-example/node_modules/bcrypt
gyp ERR! node -v v7.6.0
gyp ERR! node-gyp -v v3.5.0
gyp ERR! not ok

[joycevalencia]

try to run npm install one more time