Added warning text to the check_reqs.js log when running under OS X 1…

…0.11 El Capitan

src/scripts/check_reqs.js

@@ -36,6 +36,17 @@ xcode_version.on('close', function (code) {
 		if (ver < XCODEBUILD_MIN_VERSION) {
 		    console.log(util.format('%s : %s. (you have version %s)', TOOL, XCODEBUILD_NOT_FOUND_MESSAGE, ver));
 		}
+
+		if (os.release() >= '15.0.0') { // print the El Capitan warning
+			console.log('!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!');
+			console.log('!!!! WARNING: You are on OS X 10.11 El Capitan, you may need to add the');
+			console.log('!!!! WARNING:   `--unsafe-perm=true` flag when running `npm install`');
+			console.log('!!!! WARNING:   or else it will fail.');
+			console.log('!!!! WARNING: link:');
+			console.log('!!!! WARNING:   https://github.com/phonegap/ios-deploy#os-x-1011-el-capitan');
+			console.log('!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!');
+		}
+
 	}
 	process.exit(code);
 });