can't install ruby-enterprise-1.8.7-2011.12...

I have xcode Version 4.2.1 installed (and working in development of
several apps) ...   Yet I get this:

Checking for required software...

 * Non-broken C compiler... not found
 * Non-broken C++ compiler... not found
 * The 'make' tool... found at /usr/bin/make
 * The 'patch' tool... found at /usr/bin/patch
 * Zlib development headers... found
 * OpenSSL development headers... found
 * GNU Readline development headers... found

Some required software is not installed.
But don't worry, this installer will tell you how to install them.
Press Enter to continue, or Ctrl-C to abort.

--------------------------------------------
Installation instructions for required software

 * To install Non-broken C compiler:
   Please install the Apple Development Tools: http://developer.apple.com/tools/;
Please note that since Xcode 4, Apple uses llvm-gcc as its default
compiler, which is known to contain bugs. Some of these bugs caused
Ruby Enterprise Edition to be incorrectly compiled, causing crashes.
If you have the Development Tools installed then it means that this
installer failed to find the non-llvm version of the compiler. In that
case, please tell us about this problem.

 * To install Non-broken C++ compiler:
   Please install the Apple Development Tools: http://developer.apple.com/tools/;
Please note that since Xcode 4, Apple uses llvm-gcc as its default
compiler, which is known to contain bugs. Some of these bugs caused
Ruby Enterprise Edition to be incorrectly compiled, causing crashes.
If you have the Development Tools installed then it means that this
installer failed to find the non-llvm version of the compiler. In that
case, please tell us about this problem.

ls /usr/bin/*gcc*

--
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Here's the output from ls -la /usr/bin/*gcc*
lrwxr-xr-x  1 root  wheel  12 Jan 12 11:40 /usr/bin/gcc -> llvm-
gcc-4.2
lrwxr-xr-x  1 root  admin  52 Jan 12 11:40 /usr/bin/i686-apple-
darwin11-llvm-gcc-4.2 -> ../llvm-gcc-4.2/bin/i686-apple-darwin11-llvm-
gcc-4.2
lrwxr-xr-x  1 root  admin  32 Jan 12 11:40 /usr/bin/llvm-gcc -> ../
llvm-gcc-4.2/bin/llvm-gcc-4.2
lrwxr-xr-x  1 root  admin  32 Jan 12 11:40 /usr/bin/llvm-gcc-4.2 -> ../
llvm-gcc-4.2/bin/llvm-gcc-4.2

I'm running Mac OS X 10.7.2 (Lion) with Xcode 4.2.1

My understanding from blog posts like these (http://caiustheory.com/
install-gcc-421-apple-build-56663-with-xcode-42) is that Xcode no
longer installs non-llvm versions of the gcc.  This is causing a lot
of problems.  The blog post I linked to suggests a few ways to install
your own copies of the gcc compilers, but personally I'm hesitant to
go mucking about like that.

Hope this information helps.  Please let me know if there's any other
information I can provide.

Thanks!

On Jan 10, 5:59 am, Hongli Lai <hon...@phusion.nl> wrote: