Install node modules of mongo-express error of kerbros
<p>I'm trying to install node modules of mongoexpress module. while running <code>sudo npm install</code> I get the following warning message. Though it is a warning message i wanted to understand what cause this warning and how to avoid it. I am using Ubuntu 14.04, Node 0.12.0, MongoExpress 0.21.0</p>

<p>Thanks in advance</p>

<pre><code>sathish@sathish-Vostro-1540:~/Documents/mongo-express$ npm install
npm WARN deprecated graceful-fs@2.0.3: graceful-fs version 3 and before will fail on newer node releases. Please update to graceful-fs@^4.0.0 as soon as possible

&gt; kerberos@0.0.19 install /home/sathish/Documents/mongo-express/node_modules/kerberos
&gt; (node-gyp rebuild) || (exit 0)

child_process: customFds option is deprecated, use stdio instead.
make: Entering directory `/home/sathish/Documents/mongo-express/node_modules/kerberos/build'
  CXX(target) Release/obj.target/kerberos/lib/kerberos.o
  CXX(target) Release/obj.target/kerberos/lib/worker.o
  CC(target) Release/obj.target/kerberos/lib/kerberosgss.o
../lib/kerberosgss.c:36:0: warning: ignoring #pragma clang diagnostic [-Wunknown-pragmas]
 #pragma clang diagnostic push
 ^
../lib/kerberosgss.c:37:0: warning: ignoring #pragma clang diagnostic [-Wunknown-pragmas]
 #pragma clang diagnostic ignored "-Wdeprecated-declarations"
 ^
../lib/kerberosgss.c: In function ‘authenticate_gss_client_wrap’:
../lib/kerberosgss.c:377:19: warning: variable ‘server_conf_flags’ set but not used [-Wunused-but-set-variable]
   char buf[4096], server_conf_flags;
                   ^
../lib/kerberosgss.c: At top level:
../lib/kerberosgss.c:945:0: warning: ignoring #pragma clang diagnostic [-Wunknown-pragmas]
 #pragma clang diagnostic pop
 ^
  CC(target) Release/obj.target/kerberos/lib/base64.o
  CXX(target) Release/obj.target/kerberos/lib/kerberos_context.o
  SOLINK_MODULE(target) Release/obj.target/kerberos.node
  SOLINK_MODULE(target) Release/obj.target/kerberos.node: Finished
  COPY Release/kerberos.node
make: Leaving directory `/home/sathish/Documents/mongo-express/node_modules/kerberos/build'
basic-auth-connect@1.0.0 node_modules/basic-auth-connect

consolidate@0.12.1 node_modules/consolidate

underscore@1.6.0 node_modules/underscore

async@0.8.0 node_modules/async

serve-favicon@2.3.0 node_modules/serve-favicon
├── fresh@0.3.0
├── parseurl@1.3.1
├── etag@1.7.0
└── ms@0.7.1
</code></pre>