Mac 安装tmux 报错 C compiler cannot create executables

Question

报错信息
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You may encounter build failures or other breakages.
==> Installing dependencies for tmux: pkg-config, makedepend, libevent
==> Installing tmux dependency: pkg-config
==> Downloading http://pkgconfig.freedesktop....
Already downloaded: /Library/Caches/Homebrew/pkg-config-0.29.tar.gz
==> ./configure --prefix=/usr/local/Cellar/pkg-config/0.29 --disable-host-tool --with-internal-glib --with-pc-path=/usr
Last 15 lines from /Users/yang/Library/Logs/Homebrew/pkg-config/01.configure:
checking for gawk... no
checking for mawk... no
checking for nawk... no
checking for awk... awk
checking whether make sets $(MAKE)... yes
checking whether make supports nested variables... yes
checking build system type... x86_64-apple-darwin17.5.0
checking host system type... x86_64-apple-darwin17.5.0
checking how to print strings... printf
checking for style of include used by make... GNU
checking for gcc... clang
checking whether the C compiler works... no
configure: error: in `/private/tmp/pkg-config20180505-48853-1sfwnzj/pkg-config-0.29':
configure: error: C compiler cannot create executables
See `config.log' for more details
/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require': no implicit conversion of nil into String (TypeError)

from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /usr/local/Library/ENV/4.3/gcc-4.2:4:in `<main>'

READ THIS: https://git.io/brew-troublesh...

/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/open-uri.rb:359:in `open_http': 422 Unprocessable Entity (GitHub::Error)

from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/open-uri.rb:737:in `buffer_open'
from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/open-uri.rb:212:in `block in open_loop'
from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/open-uri.rb:210:in `catch'
from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/open-uri.rb:210:in `open_loop'
from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/open-uri.rb:151:in `open_uri'
from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/open-uri.rb:717:in `open'
from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/open-uri.rb:31:in `open'
from /usr/local/Library/Homebrew/utils.rb:461:in `open'
from /usr/local/Library/Homebrew/utils.rb:491:in `issues_matching'
from /usr/local/Library/Homebrew/utils.rb:523:in `issues_for_formula'
from /usr/local/Library/Homebrew/exceptions.rb:222:in `fetch_issues'
from /usr/local/Library/Homebrew/exceptions.rb:218:in `issues'
from /usr/local/Library/Homebrew/exceptions.rb:261:in `dump'
from /usr/local/Library/brew.rb:195:in `rescue i