npm install test fails when run in /tmp

[al-k21]

Running this:

wget https://github.com/browserify/browserify/archive/61c19943e78a5d7663603b43ad6c31985c9186cc.tar.gz # latest tar.gz (the one citgm pulls)
tar -xf 61c19943e78a5d7663603b43ad6c31985c9186cc.tar.gz
cd browserify-61c19943e78a5d7663603b43ad6c31985c9186cc
npm it

succeeds when run in /home/.. but fails in /tmp.

console output

test/bare.js ........................................ 12/13
  bare inserts dynamic __filename,__dirname
  not ok should be equivalent
    +++ found                                                                    
    --- wanted                                                                   
     [                                                                           
    -  "/tmp/browserify-test118121-19148-1hneghe.ahkubfyldi"                     
    -  "/tmp/browserify-test118121-19148-1hneghe.ahkubfyldi/dirname-filename.js"
    +  "/browserify-test118121-19148-1hneghe.ahkubfyldi"                         
    +  "/browserify-test118121-19148-1hneghe.ahkubfyldi/dirname-filename.js"     
     ]                                                                           
    at:
      line: 128
      column: 23
      file: test/bare.js
      function: log
    stack: >
      Object.log (test/bare.js:128:23)
    
      Object.<anonymous> (evalmachine.<anonymous>:3:9)
    
      Object.1.path (evalmachine.<anonymous>:8:4)
    
      s (evalmachine.<anonymous>:1:203)
    
      e (evalmachine.<anonymous>:1:374)
    
      evalmachine.<anonymous>:1:403
    
      test/bare.js:123:12
    
      ConcatStream.<anonymous> (node_modules/concat-stream/index.js:36:43)
    
      finishMaybe (node_modules/readable-stream/lib/_stream_writable.js:620:14)
    
      endWritable (node_modules/readable-stream/lib/_stream_writable.js:628:3)
    
      ConcatStream.Writable.end
      (node_modules/readable-stream/lib/_stream_writable.js:584:41)

Do you know why is it failing in /tmp? @substack
I am happy to help with this.

Ref: nodejs/citgm#545