我正在尝试使用brew包管理器安装nginx,但无法链接.我怎样才能解决这个问题？
roc-web5537:Downloads cmuench$ brew install nginx
Warning: Your Xcode (4.3.3) is outdated
Please install Xcode 4.5.
==> Installing nginx dependency: pcre
==> Downloading ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/pcre-8.31.tar.bz2
Already downloaded: /Library/Caches/Homebrew/pcre-8.31.tar.bz2
==> ./configure --prefix=/usr/local/Cellar/pcre/8.31 --enable-utf8 --enable-unicode-properties --enable-pcregrep-libz --enable-pcregrep-libbz2
==> make test
==> make install
Warning: Could not link pcre. Unlinking...
Error: The `brew link` step did not complete successfully
The formula built, but is not symlinked into /usr/local
You can try again using `brew link pcre'
==> Summary
/usr/local/Cellar/pcre/8.31: 130 files, 3.2M, built in …homebrew ×1