This took me WAY too long to figure out, but it seems like a LOT of people have trouble installing ruby-2.0.0 on OSX.
I assumed installing 2.0.0-rc2 would be easy using rbenv:
rbenv install 2.0.0-rc2
But it didn’t turn out that easy:
Inspect or clean up the working tree at /var/folders/cy/yn06vn5j6psfz7y2q83xqd7c0000gn/T/ruby-build.20130212134232.22481
Results logged to /var/folders/cy/yn06vn5j6psfz7y2q83xqd7c0000gn/T/ruby-build.20130212134232.22481.log
Last 10 log lines:
/var/folders/cy/yn06vn5j6psfz7y2q83xqd7c0000gn/T/ruby-build.20130212134232.22481/openssl-1.0.1e /var/folders/cy/yn06vn5j6psfz7y2q83xqd7c0000gn/T/ruby-build.20130212134232.22481 ~
Operating system: i686-apple-darwinDarwin Kernel Version 12.2.0: Sat Aug 25 00:48:52 PDT 2012; root:xnu-2050.18.24~1/RELEASE_X86_64
Configuring for darwin64-x86_64-cc
Usage: Configure [no-<cipher> ...][enable-<cipher> ...][experimental-<cipher> ...][-Dxxx][-lxxx][-Lxxx][-fxxx][-Kxxx][no-hw-xxx|no-hw][[no-]threads][[no-]shared][[no-]zlib|zlib-dynamic][no-asm][no-dso][no-krb5][sctp][--prefix=DIR][--openssldir=OPENSSLDIR][--with-xxx[=vvv]][--test-sanity] os/compiler[:flags]
AFTER I had used brew to install/upgrade the newest version of OpenSSL. NOTHING WORKED. SAME ERROR.
Problem? It seemed to be an issue with the most current version of rbenv/ruby-build used with brew. So I had to uninstall both from brew and use the git-clone method instead, giving me the newest version.