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最终结果是我想要在我的操作系统10.7.3上安装Ruby on Rails，但有各种问题。无法构建宝石原生扩展
此外，我从App Store有一个新安装的XCode 4.3。
当我火了终端，然后输入：
sudo gem install rails
，并将其写入了：
Building native extensions. This could take a while...
ERROR: Error installing rails:
ERROR: Failed to build gem native extension.
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby extconf.rb
mkmf.rb can't find header files for ruby at /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/ruby.h
Gem files will remain installed in /Library/Ruby/Gems/1.8/gems/json-1.6.5 for inspection.
Results logged to /Library/Ruby/Gems/1.8/gems/json-1.6.5/ext/json/ext/parser/gem_make.out
在所有我发现了修复的说，安装了XCode，我有并运行得很好。但是，我没有卸载以前版本的XCode来安装最新版本，所以我想知道是否有任何关系。
编辑1： 我遵循Jasdeep建议并安装了RVM。但是，一旦我运行：
sudo rvm install 1.9.3
我得到如下：
Fetching yaml-0.1.4.tar.gz to /Users/xxx/.rvm/archives
Extracting yaml-0.1.4.tar.gz to /Users/xxx/.rvm/src
Configuring yaml in /Users/xxx/.rvm/src/yaml-0.1.4.
Error running ' ./configure --prefix="/Users/xxx/.rvm/usr" ', please read /Users/xxx/.rvm/log/ruby-1.9.3-p0/yaml/configure.log
Compiling yaml in /Users/xxx/.rvm/src/yaml-0.1.4.
Error running 'make ', please read /Users/xxx/.rvm/log/ruby-1.9.3-p0/yaml/make.log
Database file /Users/xxx/.rvm/config/packages does not exist.
gcc-4.2: error trying to exec '/usr/bin/i686-apple-darwin11-gcc-4.2.1': execvp: No such file or directory
Installing Ruby from source to: /Users/xxx/.rvm/rubies/ruby-1.9.3-p0, this may take a while depending on your cpu(s)...
ruby-1.9.3-p0 - #fetching
ruby-1.9.3-p0 - #downloading ruby-1.9.3-p0, this may take a while depending on your connection...
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 9330k 100 9330k 0 0 645k 0 0:00:14 0:00:14 --:--:-- 1260k
ruby-1.9.3-p0 - #extracting ruby-1.9.3-p0 to /Users/xxx/.rvm/src/ruby-1.9.3-p0
ruby-1.9.3-p0 - #extracted to /Users/xxx/.rvm/src/ruby-1.9.3-p0
ruby-1.9.3-p0 - #configuring
Error running ' ./configure --prefix=/Users/xxx/.rvm/rubies/ruby-1.9.3-p0 --enable-shared --disable-install-doc --with-libyaml --with-opt-dir=/Users/xxx/.rvm/usr ', please read /Users/xxx/.rvm/log/ruby-1.9.3-p0/configure.log
There has been an error while running configure. Halting the installation.
于是我抬头一看是什么在日志文件中，..ruby-1.9.3-P0/YAML /配置。日志：
[2012-03-03 22:49:50] ./configure --prefix="/Users/xxx/.rvm/usr"
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for a thread-safe mkdir -p... config/install-sh -c -d
checking for gawk... no
checking for mawk... no
checking for nawk... no
checking for awk... awk
checking whether make sets $(MAKE)... no
checking for gcc... no
checking for cc... no
checking for cl.exe... no
configure: error: in `/Users/xxx/.rvm/src/yaml-0.1.4':
configure: error: no acceptable C compiler found in $PATH
See `config.log' for more details
所以现在出现的错误是：
no acceptable C compiler found in $PATH
编辑2：
我遵循亚光的说明，并能够得到命令行工具安装后（因为我现在有Xcode 4.3）进一步得到。不过，我仍然得到一个错误：
Fetching yaml-0.1.4.tar.gz to /Users/xxx/.rvm/archives
Extracting yaml-0.1.4.tar.gz to /Users/xxx/.rvm/src
Configuring yaml in /Users/xxx/.rvm/src/yaml-0.1.4.
Compiling yaml in /Users/xxx/.rvm/src/yaml-0.1.4.
Installing yaml to /Users/xxx/.rvm/usr
gcc-4.2: error trying to exec '/usr/bin/i686-apple-darwin11-gcc-4.2.1': execvp: No such file or directory
Installing Ruby from source to: /Users/xxx/.rvm/rubies/ruby-1.9.3-p0, this may take a while depending on your cpu(s)...
ruby-1.9.3-p0 - #fetching
ruby-1.9.3-p0 - #extracted to /Users/xxx/.rvm/src/ruby-1.9.3-p0 (already extracted)
ruby-1.9.3-p0 - #configuring
Error running ' ./configure --prefix=/Users/xxx/.rvm/rubies/ruby-1.9.3-p0 --enable-shared --disable-install-doc --with-libyaml --with-opt-dir=/Users/xxx/.rvm/usr ', please read /Users/xxx/.rvm/log/ruby-1.9.3-p0/configure.log
There has been an error while running configure. Halting the installation.
下面是configure.log（对不起这个职位越来越那么长，但希望它可以帮助别人太）：
[2012-03-04 09:29:35] ./configure --prefix="/Users/xxx/.rvm/usr"
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for a thread-safe mkdir -p... config/install-sh -c -d
checking for gawk... no
checking for mawk... no
checking for nawk... no
checking for awk... awk
checking whether make sets $(MAKE)... yes
checking for gcc... gcc
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables...
checking whether we are cross compiling... no
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ISO C89... none needed
checking for style of include used by make... GNU
checking dependency style of gcc... gcc3
checking how to run the C preprocessor... gcc -E
checking whether ln -s works... yes
checking whether make sets $(MAKE)... (cached) yes
checking build system type... x86_64-apple-darwin11.3.0
checking host system type... x86_64-apple-darwin11.3.0
checking for a sed that does not truncate output... /usr/bin/sed
checking for grep that handles long lines and -e... /usr/bin/grep
checking for egrep... /usr/bin/grep -E
checking for fgrep... /usr/bin/grep -F
checking for ld used by gcc... /usr/llvm-gcc-4.2/libexec/gcc/i686-apple-darwin11/4.2.1/ld
checking if the linker (/usr/llvm-gcc-4.2/libexec/gcc/i686-apple-darwin11/4.2.1/ld) is GNU ld... no
checking for BSD- or MS-compatible name lister (nm)... /usr/bin/nm
checking the name lister (/usr/bin/nm) interface... BSD nm
checking the maximum length of command line arguments... 196608
checking whether the shell understands some XSI constructs... yes
checking whether the shell understands "+="... yes
checking for /usr/llvm-gcc-4.2/libexec/gcc/i686-apple-darwin11/4.2.1/ld option to reload object files... -r
checking for objdump... no
checking how to recognize dependent libraries... pass_all
checking for ar... ar
checking for strip... strip
checking for ranlib... ranlib
checking command to parse /usr/bin/nm output from gcc object... ok
checking for dsymutil... dsymutil
checking for nmedit... nmedit
checking for lipo... lipo
checking for otool... otool
checking for otool64... no
checking for -single_module linker flag... yes
checking for -exported_symbols_list linker flag... yes
checking for ANSI C header files... yes
checking for sys/types.h... yes
checking for sys/stat.h... yes
checking for stdlib.h... yes
checking for string.h... yes
checking for memory.h... yes
checking for strings.h... yes
checking for inttypes.h... yes
checking for stdint.h... yes
checking for unistd.h... yes
checking for dlfcn.h... yes
checking for objdir... .libs
checking if gcc supports -fno-rtti -fno-exceptions... no
checking for gcc option to produce PIC... -fno-common -DPIC
checking if gcc PIC flag -fno-common -DPIC works... yes
checking if gcc static flag -static works... no
checking if gcc supports -c -o file.o... yes
checking if gcc supports -c -o file.o... (cached) yes
checking whether the gcc linker (/usr/llvm-gcc-4.2/libexec/gcc/i686-apple-darwin11/4.2.1/ld) supports shared libraries... yes
checking dynamic linker characteristics... darwin11.3.0 dyld
checking how to hardcode library paths into programs... immediate
checking whether stripping libraries is possible... yes
checking if libtool supports shared libraries... yes
checking whether to build shared libraries... yes
checking whether to build static libraries... yes
checking for doxygen... false
checking for ANSI C header files... (cached) yes
checking for stdlib.h... (cached) yes
checking for an ANSI C-conforming const... yes
checking for size_t... yes
configure: creating ./config.status
config.status: creating yaml-0.1.pc
config.status: creating include/Makefile
config.status: creating src/Makefile
config.status: creating Makefile
config.status: creating tests/Makefile
config.status: creating win32/Makefile
config.status: creating config.h
config.status: config.h is unchanged
config.status: executing depfiles commands
config.status: executing libtool commands
您应该安装RVM，使生活更轻松，这也给你一个机会，维护各种Ruby版本用于开发。安装就像这样简单http://beginrescueend.com/rvm/install/ – 2012-03-04 04:29:53
尝试在安装RVM之后安装ruby 1.9.2，你应该能够安装Rails就好了。 – 2012-03-04 04:30:50
当我安装rails时出现这个错误信息，问题是'rvm list'是空的。我试图在ruby之前安装rails。所以请确保你没有这样的问题。 – FedericoCapaldo 2017-02-03 08:18:39