我知道很多人都遇到过类似的问题，并且我已经尝试了许多在 stackoverflow 和其他地方发布的建议（包括：Can't install Ruby under Lion with RVM – GCC issues）。已经很长时间了（我是新手）。
我有 gcc-4.2。我使用 osx-gcc-installer 来获得 4.2。
zach$ find /usr/bin -name "*gcc *"
/usr/bin/gcc
/usr/bin/gcc-4.2
/usr/bin/i686-apple-darwin11-gcc-4.2.1
/usr/bin/i686-apple-darwin11-llvm-gcc-4.2
/usr/bin/llvm-gcc
/usr/bin/llvm-gcc-4.2
我试过了：CC=/usr/local/bin/gcc-4.2 rvm install 1.9.3 --enable-shared和rvm install 1.9.3 --with-gcc=clang。
终端错误信息：
No binary rubies available for: downloads/ruby-1.9.3-p327.
Continuing with compilation. Please read 'rvm mount' to get more information on binary rubies.
Fetching yaml-0.1.4.tar.gz to /Users/zach/.rvm/archives
Extracting yaml to /Users/zach/.rvm/src/yaml-0.1.4
Configuring yaml in /Users/zach/.rvm/src/yaml-0.1.4.
Error running 'env LDFLAGS=-L/opt/sm/pkg/active/lib CFLAGS=-I/opt/sm/pkg/active/include CPATH=/opt/sm/pkg/active/include ./configure --prefix=/Users/zach/.rvm/usr', please read /Users/zach/.rvm/log/ruby-1.9.3-p327/yaml/configure.log
Compiling yaml in /Users/zach/.rvm/src/yaml-0.1.4.
Error running 'make', please read /Users/zach/.rvm/log/ruby-1.9.3-p327/yaml/make.log
Installing Ruby from source to: /Users/zach/.rvm/rubies/ruby-1.9.3-p327, this may take a while depending on your cpu(s)...
ruby-1.9.3-p327 - #downloading ruby-1.9.3-p327, this may take a while depending on your connection...
ruby-1.9.3-p327 - #extracted to /Users/zach/.rvm/src/ruby-1.9.3-p327 (already extracted)
ruby-1.9.3-p327 - #configuring
Error running 'env LDFLAGS=-L/opt/sm/pkg/active/lib CFLAGS=-I/opt/sm/pkg/active/include CPATH=/opt/sm/pkg/active/include ./configure --enable-shared --disable-install-doc -- prefix=/Users/zach/.rvm/rubies/ruby-1.9.3-p327 --with-opt-dir=/Users/zach/.rvm/usr', please read /Users/zach/.rvm/log/ruby-1.9.3-p327/configure.log
There has been an error while running configure. Halting the installation.
配置日志：
[2012-12-05 16:13:05] env LDFLAGS=-L/opt/sm/pkg/active/lib CFLAGS=-I/opt/sm/pkg/active/include CPATH=/opt/sm/pkg/active/include ./configure -- prefix=/Users/zach/.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 $(MAKE)... yes
checking for gcc... gcc-4.2
checking whether the C compiler works... no
configure: error: in `/Users/zach/.rvm/src/yaml-0.1.4':
configure: error: C compiler cannot create executables
有关更多详细信息，请参阅“config.log”
从 config.log：
configure:2947: checking for gcc
configure:2974: result: gcc-4.2
configure:3203: checking for C compiler version
configure:3212: gcc-4.2 --version >&5
i686-apple-darwin11-gcc-4.2.1 (GCC) 4.2.1 (Apple Inc. build 5666) (dot 3)
检查链接：
zach$ ls -la /usr/bin | grep gcc
lrwxr-xr-x 1 root wheel 7 Dec 5 14:24 cc -> gcc-4.2
lrwxr-xr-x 1 root wheel 7 Dec 5 14:15 gcc -> gcc-4.2
-rwxr-xr-x 1 root wheel 113024 May 15 2011 gcc-4.2
-rwxr-xr-x 1 root wheel 562992 May 15 2011 i686-apple-darwin11-gcc-4.2.1
lrwxr-xr-x 1 taylozac85 admin 52 Dec 3 21:44 i686-apple-darwin11-llvm-g++-4.2
-> ../llvm-gcc-4.2/bin/i686-apple-darwin11-llvm-g++-4.2
lrwxr-xr-x 1 taylozac85 admin 52 Dec 3 21:44 i686-apple-darwin11-llvm-gcc-4.2
-> ../llvm-gcc-4.2/bin/i686-apple-darwin11-llvm-gcc-4.2
lrwxr-xr-x 1 taylozac85 admin 32 Dec 3 21:44 llvm-cpp-4.2 -> ../llvm-gcc-
4.2/bin/llvm-cpp-4.2
lrwxr-xr-x 1 taylozac85 admin 32 Dec 3 21:44 llvm-g++ -> ../llvm-gcc-
4.2/bin/llvm-g++-4.2
lrwxr-xr-x 1 taylozac85 admin 32 Dec 3 21:44 llvm-g++-4.2 -> ../llvm-gcc-4.2/bin/llvm-g++-4.2
lrwxr-xr-x 1 taylozac85 admin 32 Dec 3 21:44 llvm-gcc -> ../llvm-gcc-4.2/bin/llvm-gcc-4.2
lrwxr-xr-x 1 taylozac85 admin 32 Dec 3 21:44 llvm-gcc-4.2 -> ../llvm-gcc-4.2/bin/llvm-gcc-4.2
任何建议都非常感谢。谢谢。