[Mac]brew install Nginx, what happens to compile errors?

The error is as follows:

==> Downloading http://nginx.org/download/nginx-1.6.2.tar.gz

already downloaded:/library/caches/homebrew/nginx-1.6.2.tar.gz
==>./configure--prefix=/usr/local/cellar/nginx/1.6.2--with-http_ssl_module--with-pcre--with-ipv6--sbin-path =/usr/local/cel
+ Darwin 14.0.0 x86_64
Checking for C compiler ... not found

./configure:error:c compiler clang is not found

Google, one article mentions, this is because Xcode did not install command line tools caused by, but, I on another machine on the same homebrew installed nginx There is no problem, check the two sides of the Xcode version, Found 6.0.1 have problems, the latest 6.1.1 is OK, so upgraded Xcode, re-run the Brew install Nginx, OK

[Mac]brew install Nginx, what happens to compile errors?