Fallback to \n if os.EOL is not defined

lib/appenders/file.js

@@ -2,7 +2,8 @@ var layouts = require('../layouts')
 , path = require('path')
 , fs = require('fs')
 , streams = require('../streams')
-, os = require('os');
+, os = require('os')
+, eol = os.EOL || '\n';
 
 /**
  * File Appender writing the logs to a text file. Supports rolling of logs by size.
@@ -47,7 +48,7 @@ function fileAppender (file, layout, logSize, numBackups) {
     });
 
     return function(loggingEvent) {
-        logFile.write(layout(loggingEvent)+os.EOL, "utf8");
+        logFile.write(layout(loggingEvent) + eol, "utf8");
     };
 }