Unable to build Ruby 2.1.3 on OSX 10.10 GM 3.0 with rbenv

Question

I have found several threads where other users have had similar issues but none of them are seem to be like this.

After issuing the command:

rbenv install 2.1.3

I get the following errors:

Installing ruby-2.1.3...

BUILD FAILED (OS X 10.10 using ruby-build 20140926)

Inspect or clean up the working tree at /var/folders/y_/5mjltxsn35q0n_k5817bszlw0000gn/T/ruby-build.20141010202255.63586
Results logged to /var/folders/y_/5mjltxsn35q0n_k5817bszlw0000gn/T/ruby-build.20141010202255.63586.log

Last 10 log lines:
checking for stdint.h... yes
checking for unistd.h... yes
checking minix/config.h usability... no
checking minix/config.h presence... no
checking for minix/config.h... no
checking whether it is safe to define __EXTENSIONS__... yes
checking for cd using physical directory... cd -P
checking whether CFLAGS is valid... no
configure: error: something wrong with CFLAGS=" -O3 -Wno-error=shorten-64-to-32  "
make: *** No targets specified and no makefile found.  Stop.

Answer 1

The Homebrew package for gcc on Yosemite seems to be broken. That's why it doesn't work.

Had the same issue. Running:

CC=/usr/bin/gcc rbenv install 2.1.3

worked for me.