$ brew install vim
==> Installing dependencies for vim: python and ruby
==> Installing vim dependency: 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/3.7.2/Python-3.7.2.tgz
Already downloaded: /Users/ishii/Library/Caches/Homebrew/downloads/c0a14628b5078ca696f1e18227df67d9c5fbe04462c041d9252709c120ea3e1a--Python-3.7.2.tgz
==> ./configure --prefix=/usr/local/Cellar/python/3.7.2_2 --enable-ipv6 --datarootdir=/usr/local/Cellar/python/3.7.2_2/share --datadir=/usr/local/Cellar/python/3.7.2_2/share --enable-framework=/usr/local/Cellar/python/3.7.2_2/Frameworks -
Last 15 lines from /Users/ishii/Library/Logs/Homebrew/python/01.configure:
checking for size_t... yes
checking for uid_t in sys/types.h... yes
checking for ssize_t... yes
checking for __uint128_t... yes
checking size of int... 0
checking size of long... 0
checking size of long long... 0
checking size of void *... 0
checking size of short... 0
checking size of float... 0
checking size of double... 0
checking size of fpos_t... 0
checking size of size_t... configure: error: in `/private/tmp/python-20190305-37442-u0c38a/Python-3.7.2':

$ 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/3.7.2/Python-3.7.2.tgz
Already downloaded: /Users/ishii/Library/Caches/Homebrew/downloads/c0a14628b5078ca696f1e18227df67d9c5fbe04462c041d9252709c120ea3e1a--Python-3.7.2.tgz
==> ./configure --prefix=/usr/local/Cellar/python/3.7.2_2 --enable-ipv6 --datarootdir=/usr/local/Cellar/python/3.7.2_2/share --datadir=/usr/local/Cellar/python/3.7.2_2/share --enable-framework=/usr/local/Cellar/python/3.7.2_2/Frameworks -
Last 15 lines from /Users/ishii/Library/Logs/Homebrew/python/01.configure:
checking for size_t... yes
checking for uid_t in sys/types.h... yes
checking for ssize_t... yes
checking for __uint128_t... yes
checking size of int... 0
checking size of long... 0
checking size of long long... 0
checking size of void *... 0
checking size of short... 0
checking size of float... 0
checking size of double... 0
checking size of fpos_t... 0
checking size of size_t... configure: error: in `/private/tmp/python-20190305-41841-p17rug/Python-3.7.2':
configure: error: cannot compute sizeof (size_t)

xcode-select --install