brew doctor && brew --config && brew cask doctor

cask_doctor.out

==> OS X Version:
10.9.2
==> Hardware Architecture:
intel-64
==> Ruby Version:
1.8.7-p358
==> Ruby Path:
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby
==> Homebrew Version:
0.9.5
==> Homebrew Executable Path:
/usr/local/bin/brew
==> Homebrew Cellar Path:
/usr/local/Cellar
==> Homebrew-cask Version:
0.32.0
==> Contents of $LOAD_PATH:
/usr/local/Cellar/brew-cask/0.32.0/rubylib
/usr/local/Library/Homebrew
/usr/local/Library/Homebrew/vendor
/Library/Ruby/Site/1.8
/Library/Ruby/Site/1.8/powerpc-darwin13.0
/Library/Ruby/Site/1.8/universal-darwin13.0
/Library/Ruby/Site
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/vendor_ruby/1.8
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/vendor_ruby/1.8/universal-darwin13.0
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/vendor_ruby
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/powerpc-darwin13.0
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/universal-darwin13.0
.
==> Contents of $RUBYLIB Environment Variable:
nil
==> Contents of $RUBYOPT Environment Variable:
nil
==> Contents of $RUBYPATH Environment Variable:
nil
==> Contents of $RBENV_VERSION Environment Variable:
nil
==> Contents of $GEM_HOME Environment Variable:
nil
==> Contents of $GEM_PATH Environment Variable:
nil
==> Contents of $BUNDLE_PATH Environment Variable:
nil
==> Running As Privileged User:
No

config.out

HOMEBREW_VERSION: 0.9.5
ORIGIN: https://github.com/Homebrew/homebrew.git
HEAD: a5e73d44cba09a13e7536c0c665bf2a041410d88
HOMEBREW_PREFIX: /usr/local
HOMEBREW_CELLAR: /usr/local/Cellar
CPU: 8-core 64-bit ivybridge
OS X: 10.9.2-x86_64
Xcode: 5.1.1
CLT: 5.1.0.0.1.1396320587
Clang: 5.1 build 503
X11: 2.7.5 => /opt/X11
System Ruby: 1.8.7-358
Perl: /usr/bin/perl
Python: /usr/local/opt/pyenv/shims/python => /usr/local/Cellar/pyenv/20140404/shims/python
Ruby: /usr/bin/ruby => /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby

doctor.out

Warning: "config" scripts exist outside your system or Homebrew directories.
`./configure` scripts often look for *-config scripts to determine if
software packages are installed, and what additional flags to use when
compiling and linking.

Having additional scripts in your path can confuse software installed via
Homebrew if the config script overrides a system or Homebrew provided
script of the same name. We found the following "config" scripts:

    /usr/local/opt/pyenv/shims/python-config
    /usr/local/opt/pyenv/shims/python2.6-config
    /usr/local/opt/pyenv/shims/python3-config
    /usr/local/opt/pyenv/shims/python3.3-config
    /usr/local/opt/pyenv/shims/python3.3m-config
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:

    gnupg2
    gpg-agent
    osxfuse
    sshfs