brew doctor --debug

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Checking check_access_cache
Checking check_access_cellar
Checking check_access_homebrew_repository
Checking check_access_lock_dir
Checking check_access_logs
Checking check_access_prefix_directories
Checking check_access_site_packages
Checking check_clt_minimum_version
Checking check_clt_up_to_date
Checking check_dyld_vars
Checking check_filesystem_case_sensitive
Checking check_for_anaconda
Checking check_for_bad_curl
Checking check_for_bad_install_name_tool
Checking check_for_bad_python_symlink
Checking check_for_beta_xquartz
Checking check_for_config_scripts
Checking check_for_enthought_python
Checking check_for_external_cmd_name_conflict
Checking check_for_gettext
Checking check_for_git
Checking check_for_iconv
Checking check_for_installed_developer_tools
Checking check_for_latest_xquartz
Checking check_for_library_python
Checking check_for_multiple_volumes
Checking check_for_non_prefixed_coreutils
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::FormulaLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/coreutils.rb
Checking check_for_non_prefixed_findutils
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::FormulaLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/findutils.rb
Checking check_for_old_env_vars
Checking check_for_old_homebrew_share_python_in_path
Checking check_for_osx_gcc_installer
Checking check_for_other_frameworks
Checking check_for_other_package_managers
Checking check_for_pth_support
Checking check_for_pydistutils_cfg_in_home
Checking check_for_stray_developer_directory
Checking check_for_stray_dylibs
Checking check_for_stray_headers
Checking check_for_stray_las
Checking check_for_stray_pcs
Checking check_for_stray_static_libs
Checking check_for_symlinked_cellar
Checking check_for_tap_ruby_files_locations
Checking check_for_unlinked_but_not_keg_only
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/gettext.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/icu4c.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/jpeg-turbo.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/libffi.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/openssl.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/readline.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/rpcgen.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/sqlite.rb
Checking check_for_unsupported_curl_vars
Checking check_for_unsupported_macos
Checking check_git_newline_settings
Checking check_git_origin
Checking check_git_status
Checking check_git_version
Checking check_homebrew_prefix
Checking check_multiple_cellars
Checking check_path_for_trailing_slashes
Checking check_ruby_version
Checking check_ssl_cert_file
Checking check_tmpdir
Checking check_tmpdir_sticky_bit
Checking check_user_curlrc
Checking check_user_path_1
Checking check_user_path_2
Checking check_user_path_3
Checking check_which_pkg_config
Checking check_xcode_8_without_clt_on_el_capitan
Checking check_xcode_license_approved
Checking check_xcode_minimum_version
Checking check_xcode_prefix
Checking check_xcode_prefix_exists
Checking check_xcode_select_path
Checking check_xcode_up_to_date
Checking check_for_broken_symlinks
Checking check_missing_deps
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/atk.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/autoconf.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/automake.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/bsdmake.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/cairo.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/cppi.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/dhcping.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/ffmpeg.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/fltk.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/fontconfig.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/freetype.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/fribidi.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/gdbm.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/gdk-pixbuf.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/gist.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/git.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/glib.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/gmp.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/gnutls.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/gobject-introspection.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/gsasl.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/gtk+.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/harfbuzz.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/hicolor-icon-theme.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/ipcalc.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/jpeg.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/lame.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/libass.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/libevent.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/libgcrypt.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/libgpg-error.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/libpng.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/libtasn1.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/libtiff.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/libtool.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/libvirt.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/libyaml.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/little-cms2.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/lua.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/mpv.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/nettle.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/pango.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/pcre.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/perl.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/pixman.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/pkg-config.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/python.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/qemu.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/ruby.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/sdl.rb
/usr/local/Homebrew/Library/Homebrew/brew.rb (Formulary::TapLoader): loading /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/shared-mime-info.rb
Error: stack level too deep
Please report this bug:
  http://docs.brew.sh/Troubleshooting.html
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/pathname.rb:48