node.js - can't brew install node

Question

I am trying to upgrade my node via homebrew but ran into a problem because I think I tried to download through the website. I am very new to terminal. I've tried to search for answers but many people say you can just delete the unbrewed header files. I am not sure how to do that. but for some reason when I try to brew install node, it says the brew link step did not complete successfully.

I also tried to brew link node but that doesn't work either. I ran out of options so I came here.

[SICNARF@WOPR ~]$ brew install node
==> Downloading https://homebrew.bintray.com/bottles/node-0.12.7.yosemite.bottle.tar.gz
Already downloaded: /Library/Caches/Homebrew/node-0.12.7.yosemite.bottle.tar.gz
==> Pouring node-0.12.7.yosemite.bottle.tar.gz
==> Caveats
Bash completion has been installed to:
  /usr/local/etc/bash_completion.d
Error: The `brew link` step did not complete successfully
The formula built, but is not symlinked into /usr/local
Could not symlink include/node/android-ifaddrs.h
/usr/local/include/node is not writable.

You can try again using:
  brew link node
Warning: The post-install step did not complete successfully
You can try again using `brew postinstall node`
==> Summary
??  /usr/local/Cellar/node/0.12.7: 2726 files, 31M

this is what happens when i brew doctor

[SICNARF@WOPR ~]$ brew doctor
Please note that these warnings are just used to help the Homebrew maintainers
with debugging if you file an issue. If everything you use Homebrew for is
working fine: please don't worry and just ignore them. Thanks!

Warning: Unbrewed header files were found in /usr/local/include.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae, and may need to be deleted.

Unexpected header files:
    /usr/local/include/node/ares.h
    /usr/local/include/node/ares_version.h
    /usr/local/include/node/libplatform/libplatform.h
    /usr/local/include/node/nameser.h
    /usr/local/include/node/node.h
    /usr/local/include/node/node_buffer.h
    /usr/local/include/node/node_internals.h
    /usr/local/include/node/node_object_wrap.h
    /usr/local/include/node/node_version.h
    /usr/local/include/node/openssl/aes.h
    /usr/local/include/node/openssl/asn1.h
    /usr/local/include/node/openssl/asn1_mac.h
    /usr/local/include/node/openssl/asn1t.h
    /usr/local/include/node/openssl/bio.h
    /usr/local/include/node/openssl/blowfish.h
    /usr/local/include/node/openssl/bn.h
    /usr/local/include/node/openssl/buffer.h
    /usr/local/include/node/openssl/camellia.h
    /usr/local/include/node/openssl/cast.h
    /usr/local/include/node/openssl/cmac.h
    /usr/local/include/node/openssl/cms.h
    /usr/local/include/node/openssl/comp.h
    /usr/local/include/node/openssl/conf.h
    /usr/local/include/node/openssl/conf_api.h
    /usr/local/include/node/openssl/crypto.h
    /usr/local/include/node/openssl/des.h
    /usr/local/include/node/openssl/des_old.h
    /usr/local/include/node/openssl/dh.h
    /usr/local/include/node/openssl/dsa.h
    /usr/local/include/node/openssl/dso.h
    /usr/local/include/node/openssl/dtls1.h
    /usr/local/include/node/openssl/e_os2.h
    /usr/local/include/node/openssl/ebcdic.h
    /usr/local/include/node/openssl/ec.h
    /usr/local/include/node/openssl/ecdh.h
    /usr/local/include/node/openssl/ecdsa.h
    /usr/local/include/node/openssl/engine.h
    /usr/local/include/node/openssl/err.h
    /usr/local/include/node/openssl/evp.h
    /usr/local/include/node/openssl/hmac.h
    /usr/local/include/node/openssl/idea.h
    /usr/local/include/node/openssl/krb5_asn.h
    /usr/local/include/node/openssl/kssl.h
    /usr/local/include/node/openssl/lhash.h
    /usr/local/include/node/openssl/md4.h
    /usr/local/include/node/openssl/md5.h
    /usr/local/include/node/openssl/mdc2.h
    /usr/local/include/node/openssl/modes.h
    /usr/local/include/node/openssl/obj_mac.h
    /usr/local/include/node/openssl/objects.h
    /usr/local/include/node/openssl/ocsp.h
    /usr/local/include/node/openssl/opensslconf.h
    /usr/local/include/node/openssl/opensslv.h
    /usr/local/include/node/openssl/ossl_typ.h
    /usr/local/include/node/openssl/pem.h
    /usr/local/include/node/openssl/pem2.h
    /usr/local/include/node/openssl/pkcs12.h
    /usr/local/include/node/openssl/pkcs7.h
    /usr/local/include/node/openssl/pqueue.h
    /usr/local/include/node/openssl/rand.h
    /usr/local/include/node/openssl/rc2.h
    /usr/local/include/node/openssl/rc4.h
    /usr/local/include/node/openssl/ripemd.h
    /usr/local/include/node/openssl/rsa.h
    /usr/local/include/node/openssl/safestack.h
    /usr/local/include/node/openssl/seed.h
    /usr/local/include/node/openssl/sha.h
    /usr/local/include/node/openssl/srp.h
    /usr/local/include/node/openssl/srtp.h
    /usr/local/include/node/openssl/ssl.h
    /usr/local/include/node/openssl/ssl2.h
    /usr/local/include/node/openssl/ssl23.h
    /usr/local/include/node/openssl/ssl3.h
    /usr/local/include/node/openssl/stack.h
    /usr/local/include/node/openssl/symhacks.h
    /usr/local/include/node/openssl/tls1.h
    /usr/local/include/node/openssl/ts.h
    /usr/local/include/node/openssl/txt_db.h
    /usr/local/include/node/openssl/ui.h
    /usr/local/include/node/openssl/ui_compat.h
    /usr/local/include/node/openssl/whrlpool.h
    /usr/local/include/node/openssl/x509.h
    /usr/local/include/node/openssl/x509_vfy.h
    /usr/local/include/node/openssl/x509v3.h
    /usr/local/include/node/pthread-fixes.h
    /usr/local/include/node/smalloc.h
    /usr/local/include/node/stdint-msvc2008.h
    /usr/local/include/node/tree.h
    /usr/local/include/node/uv-aix.h
    /usr/local/include/node/uv-bsd.h
    /usr/local/include/node/uv-darwin.h
    /usr/local/include/node/uv-errno.h
    /usr/local/include/node/uv-linux.h
    /usr/local/include/node/uv-sunos.h
    /usr/local/include/node/uv-threadpool.h
    /usr/local/include/node/uv-unix.h
    /usr/local/include/node/uv-version.h
    /usr/local/include/node/uv-win.h
    /usr/local/include/node/uv.h
    /usr/local/include/node/v8-debug.h
    /usr/local/include/node/v8-platform.h
    /usr/local/include/node/v8-profiler.h
    /usr/local/include/node/v8-testing.h
    /usr/local/include/node/v8-util.h
    /usr/local/include/node/v8.h
    /usr/local/include/node/v8config.h
    /usr/local/include/node/v8stdint.h
    /usr/local/include/node/zconf.h
    /usr/local/include/node/zlib.h

Warning: You have unlinked kegs in your Cellar
Leaving kegs unlinked can lead to build-trouble and cause brews that depend on
those kegs to fail to run properly once built. Run `brew link` on these:

    node
[SICNARF@WOPR ~]$ brew link
This command requires a keg argument
[SICNARF@WOPR ~]$ brew link node
Linking /usr/local/Cellar/node/0.12.7... 
Error: Could not symlink include/node/android-ifaddrs.h
/usr/local/include/node is not writable.

Answer 1

There are two steps involved.

1. Simply run these four commands:

    sudo chown -R `whoami`:admin /usr/local/include/node
    sudo chown -R `whoami`:admin /usr/local/bin
    sudo chown -R `whoami`:admin /usr/local/share
    sudo chown -R `whoami`:admin /usr/local/lib/dtrace 

2. Finally, run the overwrite command:

    brew link --overwrite node