由于符号链接错误，无法在Mac OSX 10.8.1中安装ruby-1.9.2

Question

首先，我尝试了普通的rvm安装。

rvm安装1.9.2

但是，显示了以下错误：

The provided compiler '/usr/bin/gcc' is LLVM based, it is not yet fully supported by ruby and gems, please read `rvm requirements`.

然后我跑

rvm requirements

并发现下面这些输出部分很有用

Right now Ruby requires gcc to compile, but Xcode 4.2 and later no longer ship with gcc. Instead they ship with llvm-gcc (to which gcc is a symlink) and clang, neither of which are supported for building Ruby. Xcode 4.1 was the last version to ship gcc, which was /usr/bin/gcc-4.2.

Xcode 4.1 and earlier:
- Ruby will build fine.

Xcode 4.2 and later (including Command Line Tools for Xcode):
- If you have gcc-4.2 (and friends) from an earlier Xcode version, Ruby will build fine.
- If you don't have gcc-4.2, you have two options to get it:
 * Install apple-gcc42 from Homebrew
 * Install osx-gcc-installer

Homebrew:
If you are using Homebrew, you can install the apple-gcc42 and required libraries from homebrew/dupes:
 brew update
 brew tap homebrew/dupes
 brew install autoconf automake apple-gcc42 
 rvm pkg install openssl

This can live side by side with an existing Xcode 4.2+ install or Command Line Tools for Xcode.

所以我试着：

brew update
brew tap homebrew/dupes
brew install autoconf automake apple-gcc42 

但是，我得到了以下错误

Warning: Could not link apple-gcc42. 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 apple-gcc42'
==> Summary
/usr/local/Cellar/apple-gcc42/4.2.1-5666.3: 104 files, 75M, built in 23 seconds
kanitw:shell.venturelab.com kanitw$ brew link apple-gcc42
Linking /usr/local/Cellar/apple-gcc42/4.2.1-5666.3... Warning: Could not link apple-gcc42. Unlinking...
Error: Could not symlink file: /usr/local/Cellar/apple-gcc42/4.2.1-5666.3/include/gcc
/usr/local/include is not writable. You should change its permissions.

我最好的解决方案是什么？我记得在某个地方我不应该在brew中使用sudo，因为我会搞砸整个安装。

Answer 1

您可以更改/usr/local目录所有者

sudo chown -R `whoami` /usr/local

但是，如果您安装了mysql，则必须修复其所有者

sudo chown -R mysql:mysql /usr/local/mysql

Answer 2

您应该运行brew doctor，然后相应地更改权限。可能还有其他问题。

Answer 3

请更改/usr/local目录的权限，然后重试。