python3-homebrew-install-fail.txt

gistfile1.txt

$ brew install python
Warning: Building python from source:
  The bottle needs the Apple Command Line Tools to be installed.
  You can install them, if desired, with:
    xcode-select --install

==> Downloading https://www.python.org/ftp/python/3.7.0/Python-3.7.0.tar.xz
Already downloaded: /Users/martijnv/Library/Caches/Homebrew/downloads/f87e3a4f88925ead242c820be2fef7aa64d70507a5c4f8e544e666263a881f41--Python-3.7.0.tar.xz
==> ./configure --prefix=/usr/local/Cellar/python/3.7.0 --enable-ipv6 --dataroot
==> make
==> make install PYTHONAPPSDIR=/usr/local/Cellar/python/3.7.0
Last 15 lines from /Users/martijnv/Library/Logs/Homebrew/python/03.make:
NS_DEPRECATED_MAC(10_8, API_TO_BE_DEPRECATED, "All NSUserNotifications API should be replaced with UserNotifications.frameworks API")
                        ^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSUserNotification.h:102:26: error: expected a version of the form 'major[.minor[.subminor]]'
NS_DEPRECATED_MAC(10_10, API_TO_BE_DEPRECATED, "All NSUserNotifications API should be replaced with UserNotifications.frameworks API")
                         ^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSUserNotification.h:115:95: error: expected a version of the form 'major[.minor[.subminor]]'
FOUNDATION_EXPORT NSString * const NSUserNotificationDefaultSoundName NS_DEPRECATED_MAC(10_8, API_TO_BE_DEPRECATED, "All NSUserNotifications API should be replaced with UserNotifications.frameworks API") API_UNAVAILABLE(ios, watchos, tvos);
                                                                                              ^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSUserNotification.h:117:25: error: expected a version of the form 'major[.minor[.subminor]]'
NS_DEPRECATED_MAC(10_8, API_TO_BE_DEPRECATED, "All NSUserNotifications API should be replaced with UserNotifications.frameworks API")
                        ^
6 errors generated.
make[2]: *** [FileSettings.o] Error 1
make[1]: *** [install_PythonLauncher] Error 2
make: *** [frameworkinstallapps] Error 2
/usr/local/Homebrew/Library/Homebrew/utils/fork.rb:49:in `write': Broken pipe (Errno::EPIPE)
	from /usr/local/Homebrew/Library/Homebrew/utils/fork.rb:49:in `puts'
	from /usr/local/Homebrew/Library/Homebrew/utils/fork.rb:49:in `rescue in block (3 levels) in safe_fork'
	from /usr/local/Homebrew/Library/Homebrew/utils/fork.rb:31:in `block (3 levels) in safe_fork'
	from /usr/local/Homebrew/Library/Homebrew/utils/fork.rb:30:in `fork'
	from /usr/local/Homebrew/Library/Homebrew/utils/fork.rb:30:in `block (2 levels) in safe_fork'
	from /usr/local/Homebrew/Library/Homebrew/utils/fork.rb:27:in `open'
	from /usr/local/Homebrew/Library/Homebrew/utils/fork.rb:27:in `block in safe_fork'
	from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/tmpdir.rb:89:in `mktmpdir'
	from /usr/local/Homebrew/Library/Homebrew/utils/fork.rb:26:in `safe_fork'
	from /usr/local/Homebrew/Library/Homebrew/formula_installer.rb:719:in `build'
	from /usr/local/Homebrew/Library/Homebrew/formula_installer.rb:311:in `install'
	from /usr/local/Homebrew/Library/Homebrew/cmd/install.rb:321:in `install_formula'
	from /usr/local/Homebrew/Library/Homebrew/cmd/install.rb:253:in `block in install'
	from /usr/local/Homebrew/Library/Homebrew/cmd/install.rb:251:in `each'
	from /usr/local/Homebrew/Library/Homebrew/cmd/install.rb:251:in `install'
	from /usr/local/Homebrew/Library/Homebrew/brew.rb:89:in `<main>'

READ THIS: https://docs.brew.sh/Troubleshooting

These open issues may also help:
pipenv cannot easily manage multiple python versions https://github.com/Homebrew/homebrew-core/issues/31487
WeeChat fails to build --with-python https://github.com/Homebrew/homebrew-core/issues/30509
Python fails to build on macOS 10.13.6, with MacOSX10.14.sdk command line tools. https://github.com/Homebrew/homebrew-core/issues/31679
Jupyter notebook is launched with PYTHONPATH, modifies sys.path in Python kernels https://github.com/Homebrew/homebrew-core/issues/31325
`vim` fails to build from source with option `--with-client-server` when python is installed with '--with-tcl-tk' https://github.com/Homebrew/homebrew-core/issues/30949
$ which ruby
/usr/bin/ruby

It looks like homebrew's python package implicitly relies on its own ruby to be installed, even if it is not listed as a dependency.

I solved this issue by brew install ruby and brew install python again.

Root cause turned out to be something else. I had XCode 10 installed on High Sierra (10.13). XCode 10 installs 10.14 CLT, so after removing XCode 10 and the CLT, downloading XCode 9.x, and re-doing xcode-select --install things were fine.

Note, I did also try the separate 10.13 CLT installer, which failed with an unhelpful error message.