rebuild: Can't rebuild nslog on windows

I’m running electron-rebuild on an Appveyor machine and cannot rebuild the nslog module. I’ve tried a seemingly endless combination of node, npm, python, and visual studio versions to no avail. Here’s the log, any ideas?

C:\projects\my-app\app\node_modules\nslog>if not defined npm_config_node_gyp (node "C:\projects\my-app\app\node_modules\npm\bin\node-gyp-bin\\..\..\node_modules\node-gyp\bin\node-gyp.js" rebuild )  else (node  rebuild ) 

npm WARN prefer global coffee-script@1.9.3 should be installed with -g
gyp ERR! clean error 
gyp ERR! stack Error: EPERM, unlink 'C:\projects\my-app\app\node_modules\nslog\build\Release\nslog.node'
gyp ERR! stack     at Error (native)
gyp ERR! System Windows_NT 6.3.9600
gyp ERR! command "node" "C:\\projects\\my-app\\app\\node_modules\\npm\\node_modules\\node-gyp\\bin\\node-gyp.js" "rebuild"
gyp ERR! cwd C:\projects\my-app\app\node_modules\nslog
gyp ERR! node -v v0.12.7
gyp ERR! node-gyp -v v2.0.2
gyp ERR! not ok 

npm ERR! Windows_NT 6.3.9600
npm ERR! argv "node" "C:\\projects\\mavensmate-app\\app\\node_modules\\npm\\bin\\npm-cli.js" "rebuild" "--target=0.30.2" "--arch=ia32"
npm ERR! node v0.12.7
npm ERR! npm  v3.2.1
npm ERR! code ELIFECYCLE
npm ERR! nslog@2.0.0 install: `node-gyp rebuild`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the nslog@2.0.0 install script 'node-gyp rebuild'.
npm ERR! This is most likely a problem with the nslog package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     node-gyp rebuild
npm ERR! You can get their info via:
npm ERR!     npm owner ls nslog
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR!     C:\projects\my-app\app\node_modules\npm-debug.log

Process exited with code: 1

Please note npm install nslog works fine.