HomeBrew and PostgreSQL. Illegal instruction: 4

brew_config.sh

$ brew config
HOMEBREW_VERSION: 0.9.5
ORIGIN: https://github.com/Homebrew/homebrew
HEAD: dcb3cf09cba68f891bb8eda4b1735b50996a85b9
Last commit: 6 hours ago
HOMEBREW_PREFIX: /usr/local
HOMEBREW_REPOSITORY: /usr/local
HOMEBREW_CELLAR: /usr/local/Cellar
HOMEBREW_BOTTLE_DOMAIN: https://homebrew.bintray.com
CPU: quad-core 64-bit ivybridge
OS X: 10.11.2-x86_64
Xcode: 7.2
CLT: 7.2.0.0.1.1447826929
Clang: 7.0 build 700
X11: N/A
System Ruby: 2.0.0-p645
Perl: /usr/bin/perl
Python: /usr/local/bin/python => /usr/local/Cellar/python/2.7.11/Frameworks/Python.framework/Versions/2.7/bin/python2.7
Ruby: /usr/bin/ruby => /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby
Java: N/A

brew_doctor.sh

$ 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Warning: Your XQuartz (2.7.6) is outdated
Please install XQuartz 2.7.8:
  https://xquartz.macosforge.org

gist_logs.sh

$ brew gist-logs postgresql
Error: No logs.