title: npm install crashing with errors
body: <p>I am working with a Node.js / parse-server project (on Heroku), where it seems like I am having some problem from the beginning. Can anyone let me know if they see something wrong?</p>
  
  <p>This is the package.json file:</p>
  
  <pre><code>{
   "name": "parse-server-example",
   "version": "1.4.0",
   "description": "An example Parse API server using the parse-server module",
   "main": "index.js",
   "repository": {
     "type": "git",
     "url": "https://github.com/ParsePlatform/parse-server-example"
   },
   "license": "MIT",
   "dependencies": {
     "@parse/simple-mailgun-adapter": "^1.0.3",
     "bcryptjs": "^2.4.3",
     "body-parser": "1.19.0",
     "ejs": "^3.0.1",
     "express": "^4.17.1",
     "kerberos": "~0.0.x",
     "parse": "~1.8.0",
     "parse-server": "*"
   },
   "scripts": {
     "start": "node index.js"
   },
   "engines": {
     "node": "&gt;=4.3"
   }
  }
  </code></pre>
  
  <p>And this is how it goes when I try to run <code>npm install</code>:</p>
  
  <pre><code>ShellPrompt$ npm install
  
  &gt; bcrypt@1.0.2 install /Users/me/Documents/Heroku/myap/node_modules/parse-server/node_modules/bcrypt
  &gt; node-pre-gyp install --fallback-to-build
  
  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-v72-darwin-x64.tar.gz 
  node-pre-gyp ERR! Pre-built binaries not found for bcrypt@1.0.2 and node@12.16.0 (node-v72 ABI) (falling back to source compile with node-gyp) 
  node-pre-gyp ERR! Tried to download(undefined): https://github.com/kelektiv/node.bcrypt.js/releases/download/v1.0.2/bcrypt_lib-v1.0.2-node-v72-darwin-x64.tar.gz 
  node-pre-gyp ERR! Pre-built binaries not found for bcrypt@1.0.2 and node@12.16.0 (node-v72 ABI) (falling back to source compile with node-gyp) 
    CXX(target) Release/obj.target/bcrypt_lib/src/blowfish.o
    CXX(target) Release/obj.target/bcrypt_lib/src/blowfish.o
  rm: ./Release/.deps/Release/obj.target/bcrypt_lib/src/blowfish.o.d.raw: No such file or directory
  make: *** [Release/obj.target/bcrypt_lib/src/blowfish.o] Error 1
  gyp  CXX(target) Release/obj.target/bcrypt_lib/src/bcrypt.o
   ERR! build error 
  gyp ERR! stack Error: `make` failed with exit code: 2
  gyp ERR! stack     at ChildProcess.onExit (/usr/local/lib/node_modules/npm/node_modules/node-gyp/lib/build.js:194:23)
  gyp ERR! stack     at ChildProcess.emit (events.js:321:20)
  gyp ERR! stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:275:12)
  gyp ERR! System Darwin 18.7.0
  gyp ERR! command "/usr/local/bin/node" "/usr/local/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js" "build" "--fallback-to-build" "--module=/Users/me/Documents/Heroku/myap/node_modules/parse-server/node_modules/bcrypt/lib/binding/bcrypt_lib.node" "--module_name=bcrypt_lib" "--module_path=/Users/me/Documents/Heroku/myap/node_modules/parse-server/node_modules/bcrypt/lib/binding"
  gyp ERR! cwd /Users/me/Documents/Heroku/myap/node_modules/parse-server/node_modules/bcrypt
  gyp ERR! node -v v12.16.0
  gyp ERR! node-gyp -v v5.0.5
  gyp ERR! not ok 
  node-pre-gyp ERR! build error 
  node-pre-gyp ERR! stack Error: Failed to execute '/usr/local/bin/node /usr/local/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js build --fallback-to-build --module=/Users/me/Documents/Heroku/myap/node_modules/parse-server/node_modules/bcrypt/lib/binding/bcrypt_lib.node --module_name=bcrypt_lib --module_path=/Users/me/Documents/Heroku/myap/node_modules/parse-server/node_modules/bcrypt/lib/binding' (1)
  node-pre-gyp ERR! stack     at ChildProcess.&lt;anonymous&gt; (/Users/me/Documents/Heroku/myap/node_modules/parse-server/node_modules/node-pre-gyp/lib/util/compile.js:83:29)
  node-pre-gyp ERR! stack     at ChildProcess.emit (events.js:321:20)
  node-pre-gyp ERR! stack     at maybeClose (internal/child_process.js:1021:16)
  node-pre-gyp ERR! stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:286:5)
  node-pre-gyp ERR! System Darwin 18.7.0
  node-pre-gyp ERR! command "/usr/local/bin/node" "/Users/me/Documents/Heroku/myap/node_modules/parse-server/node_modules/.bin/node-pre-gyp" "install" "--fallback-to-build"
  node-pre-gyp ERR! cwd /Users/me/Documents/Heroku/myap/node_modules/parse-server/node_modules/bcrypt
  node-pre-gyp ERR! node -v v12.16.0
  node-pre-gyp ERR! node-pre-gyp -v v0.6.32
  node-pre-gyp ERR! not ok 
  Failed to execute '/usr/local/bin/node /usr/local/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js build --fallback-to-build --module=/Users/me/Documents/Heroku/myap/node_modules/parse-server/node_modules/bcrypt/lib/binding/bcrypt_lib.node --module_name=bcrypt_lib --module_path=/Users/me/Documents/Heroku/myap/node_modules/parse-server/node_modules/bcrypt/lib/binding' (1)
  ../src/bcrypt.cc:52:10: fatal error: 'node_blf.h' file not found4
  #include "node_blf.h"
           ^~~~~~~~~~~~
  1 error generated.
  make: *** [Release/obj.target/bcrypt_lib/src/bcrypt.o] Error 1
  gyp ERR! build error 
  gyp ERR! stack Error: `make` failed with exit code: 2
  gyp ERR! stack     at ChildProcess.onExit (/usr/local/lib/node_modules/npm/node_modules/node-gyp/lib/build.js:194:23)
  gyp ERR! stack     at ChildProcess.emit (events.js:321:20)
  gyp ERR! stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:275:12)
  gyp ERR! System Darwin 18.7.0
  gyp ERR! command "/usr/local/bin/node" "/usr/local/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js" "build" "--fallback-to-build" "--module=/Users/me/Documents/Heroku/myap/node_modules/parse-server/node_modules/bcrypt/lib/binding/bcrypt_lib.node" "--module_name=bcrypt_lib" "--module_path=/Users/me/Documents/Heroku/myap/node_modules/parse-server/node_modules/bcrypt/lib/binding"
  gyp ERR! cwd /Users/me/Documents/Heroku/myap/node_modules/parse-server/node_modules/bcrypt
  gyp ERR! node -v v12.16.0
  gyp ERR! node-gyp -v v5.0.5
  gyp ERR! not ok 
  npm WARN optional SKIPPING OPTIONAL DEPENDENCY: bcrypt@1.0.2 (node_modules/parse-server/node_modules/bcrypt):
  npm WARN optional SKIPPING OPTIONAL DEPENDENCY: bcrypt@1.0.2 install: `node-pre-gyp install --fallback-to-build`
  npm WARN optional SKIPPING OPTIONAL DEPENDENCY: Exit status 1
  
  audited 1129 packages in 7.152s
  
  1 package is looking for funding
    run `npm fund` for details
  
  found 108 vulnerabilities (25 low, 49 moderate, 34 high)
    run `npm audit fix` to fix them, or `npm audit` for details
  ShellPrompt$ 
  </code></pre>
  
  <p>I have tried to get rid of this line, in package.json:</p>
  
  <pre><code>"bcryptjs": "^2.4.3",
  </code></pre>
  
  <p>But in either case I run into the same kind of trouble.</p>