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我正在尝试从约翰斯霍普金斯大学的Ruby课程课程。 Mac OSX设置说明要求我下载自制软件，然后安装rbenv。我已经用我已经做了很长时间的东西来安装brew了，所以也许这个问题是因为我很久以前搞糟了安装ruby/brew。使用Brew安装rbenv
这里是一个的给我发出命令：brew install rbenv ruby-build 我得到的回应是这样的：
Warning: rbenv-0.4.0 already installed, it's just not linked
==> Installing dependencies for ruby-build: pkg-config, openssl
Error: Cannot link pkg-config
Another version is already linked: /usr/local/Cellar/pkg-config/0.28
更新：下面是运行brew doctor之后所出现：
Warning: /usr/local/bin isn't writable.
This can happen if you "sudo make install" software that isn't managed
by Homebrew. If a formula tries to write a file to this directory, the
install will fail during the link step.
You should probably change the ownership and permissions of /usr/local/bin
back to your user account.
sudo chown -R $(whoami) /usr/local/bin
Warning: /usr/local/share isn't writable.
This can happen if you "sudo make install" software that isn't managed
by Homebrew. If a formula tries to write a file to this directory, the
install will fail during the link step.
You should probably change the ownership and permissions of /usr/local/share
back to your user account.
sudo chown -R $(whoami) /usr/local/share
Warning: Some directories in /usr/local/share/man aren't writable.
This can happen if you "sudo make install" software that isn't managed
by Homebrew. If a brew tries to add locale information to one of these
directories, then the install will fail during the link step.
You should probably `sudo chown -R $(whoami)` them:
/usr/local/share/man
/usr/local/share/man/man1
/usr/local/share/man/man5
/usr/local/share/man/mann
Warning: Broken symlinks were found. Remove them with `brew prune`:
/usr/local/bin/2to3-3.3
/usr/local/bin/apm
/usr/local/bin/atom
/usr/local/bin/idle3.3
/usr/local/bin/python3.3-32
/usr/local/bin/pythonw3
/usr/local/bin/pythonw3-32
/usr/local/bin/pythonw3.3
/usr/local/bin/pythonw3.3-32
/usr/local/bin/pyvenv-3.3
/usr/local/bin/subl
Warning: Python is installed at /Library/Frameworks/Python.framework
Homebrew only supports building against the System-provided Python or a
brewed Python. In particular, Pythons installed to /Library can interfere
with other software installs.
Warning: Unbrewed dylibs were found in /usr/local/lib.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae, and may need to be deleted.
Unexpected dylibs:
/usr/local/lib/libMonoPosixHelper.dylib
/usr/local/lib/libSFFileMonitor.32.dylib
/usr/local/lib/libSFIPC.32.dylib
/usr/local/lib/libSFIPC.I.dylib
/usr/local/lib/libSFsqlite3.7.4.dylib
/usr/local/lib/libSFSyncEngine.I.dylib
/usr/local/lib/libtcl8.6.dylib
/usr/local/lib/libtk8.6.dylib
Warning: Unbrewed header files were found in /usr/local/include.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae, and may need to be deleted.
Unexpected header files:
/usr/local/include/fakemysql.h
/usr/local/include/fakepq.h
/usr/local/include/fakesql.h
/usr/local/include/itcl.h
/usr/local/include/itcl2TclOO.h
/usr/local/include/itclDecls.h
/usr/local/include/itclInt.h
/usr/local/include/itclIntDecls.h
/usr/local/include/itclMigrate2TclCore.h
/usr/local/include/itclTclIntStubsFcn.h
/usr/local/include/mysqlStubs.h
/usr/local/include/node/ares.h
/usr/local/include/node/ares_version.h
/usr/local/include/node/nameser.h
/usr/local/include/node/node.h
/usr/local/include/node/node_buffer.h
/usr/local/include/node/node_internals.h
/usr/local/include/node/node_object_wrap.h
/usr/local/include/node/node_version.h
/usr/local/include/node/openssl/opensslconf.h
/usr/local/include/node/uv-private/ngx-queue.h
/usr/local/include/node/uv-private/stdint-msvc2008.h
/usr/local/include/node/uv-private/tree.h
/usr/local/include/node/uv-private/uv-bsd.h
/usr/local/include/node/uv-private/uv-darwin.h
/usr/local/include/node/uv-private/uv-linux.h
/usr/local/include/node/uv-private/uv-sunos.h
/usr/local/include/node/uv-private/uv-unix.h
/usr/local/include/node/uv-private/uv-win.h
/usr/local/include/node/uv.h
/usr/local/include/node/v8-debug.h
/usr/local/include/node/v8-preparser.h
/usr/local/include/node/v8-profiler.h
/usr/local/include/node/v8-testing.h
/usr/local/include/node/v8.h
/usr/local/include/node/v8stdint.h
/usr/local/include/node/zconf.h
/usr/local/include/node/zlib.h
/usr/local/include/odbcStubs.h
/usr/local/include/pqStubs.h
/usr/local/include/tcl.h
/usr/local/include/tclDecls.h
/usr/local/include/tclOO.h
/usr/local/include/tclOODecls.h
/usr/local/include/tclPlatDecls.h
/usr/local/include/tclThread.h
/usr/local/include/tclTomMath.h
/usr/local/include/tclTomMathDecls.h
/usr/local/include/tdbc.h
/usr/local/include/tdbcDecls.h
/usr/local/include/tdbcInt.h
/usr/local/include/tk.h
/usr/local/include/tkDecls.h
/usr/local/include/tkPlatDecls.h
Warning: Unbrewed .pc files were found in /usr/local/lib/pkgconfig.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae, and may need to be deleted.
Unexpected .pc files:
/usr/local/lib/pkgconfig/tcl.pc
/usr/local/lib/pkgconfig/tk.pc
Warning: Unbrewed static libraries were found in /usr/local/lib.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae, and may need to be deleted.
Unexpected static libraries:
/usr/local/lib/libtclstub8.6.a
/usr/local/lib/libtkstub8.6.a
Warning: You have unlinked kegs in your Cellar
Leaving kegs unlinked can lead to build-trouble and cause brews that depend on
those kegs to fail to run properly once built. Run `brew link` on these:
rbenv
Warning: You have uncommitted modifications to Homebrew
If this is a surprise to you, then you should stash these modifications.
Stashing returns Homebrew to a pristine state but can be undone
should you later need to do so for some reason.
cd /usr/local/Library && git stash && git clean -d -f
Warning: /usr/bin occurs before /usr/local/bin
This means that system-provided programs will be used instead of those
provided by Homebrew. The following tools exist at both paths:
2to3
2to3-2.7
easy_install
easy_install-2.7
idle
idle2.7
info
infokey
install-info
makeinfo
pydoc
pydoc2.7
python
python-config
python2.7
python2.7-config
pythonw
pythonw2.7
smtpd.py
smtpd2.7.py
tclsh
tclsh8.5
texi2dvi
texi2pdf
texindex
wish
wish8.5
Consider setting your PATH so that /usr/local/bin
occurs before /usr/bin. Here is a one-liner:
echo 'export PATH="/usr/local/bin:$PATH"' >> ~/.bash_profile`
新更新： 我做brew prune，更改了它建议的文件的所有权（其中一些找不到）。最后，当我运行brew install rbenv ruby-build我得到以下错误：
Warning: rbenv-0.4.0 already installed, it's just not linked
Warning: ruby-build-20151028 already installed
下一步是做rbenv install 2.2.3，但rbenv命令没有找到。似乎以某种方式安装失败。 which rbenv也没有输出。
尝试运行'brew doctor'并让我们知道输出。应该帮助确定你的问题。 – tombeynon