https://github.com/wayneeseguin/rvm/issues/1121

gistfile1.txt

(Lines prefixed with *** are colored red or looked suspicious to me)

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[davidf /Users/davidf]$ rvm get head && rvm reinstall 1.9.3

  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 10956  100 10956    0     0   8842      0  0:00:01  0:00:01 --:--:-- 10.4M
Downloading RVM from wayneeseguin branch master
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 1435k  100 1435k    0     0   306k      0  0:00:04  0:00:04 --:--:--  393k

Upgrading the RVM installation in /Users/davidf/.rvm/
    RVM PATH line found in /Users/davidf/.bashrc /Users/davidf/.zshrc.
    RVM sourcing line found in /Users/davidf/.bash_profile /Users/davidf/.zlogin.

Upgrade Notes:


  * WARNING: You're using ~/.profile, make sure you load it,
    add the following line to ~/.bash_profile if it exists
    otherwise add it to ~/.bash_login:

      source ~/.profile

***grep: /etc/rvmrc: No such file or directory
  * No new notes to display.

# RVM:  Shell scripts enabling management of multiple ruby environments.
# RTFM: https://rvm.io/
# HELP: http://webchat.freenode.net/?channels=rvm (#rvm on irc.freenode.net)
# Cheatsheet: http://cheat.errtheblog.com/s/rvm/
# Screencast: http://screencasts.org/episodes/how-to-use-rvm

# In case of any issues read output of 'rvm requirements' and/or 'rvm notes'

Upgrade of RVM in /Users/davidf/.rvm/ is complete.

# David Foster,
#
#   Thank you for using RVM!
#   I sincerely hope that RVM helps to make your life easier and
#   more enjoyable!!!
#
# ~Wayne

RVM reloaded!
Removing /Users/davidf/.rvm/src/ruby-1.9.3-p362...
Removing /Users/davidf/.rvm/rubies/ruby-1.9.3-p362...
Searching for binary rubies, this might take some time.
No binary rubies available for: osx/10.7/x86_64/ruby-1.9.3-p362.
Continuing with compilation. Please read 'rvm mount' to get more information on binary rubies.
Fetching yaml-0.1.4.tar.gz to /Users/davidf/.rvm/archives
Extracting yaml to /Users/davidf/.rvm/src/yaml-0.1.4
Configuring yaml in /Users/davidf/.rvm/src/yaml-0.1.4.
Compiling yaml in /Users/davidf/.rvm/src/yaml-0.1.4.
***Error running 'make', please read /Users/davidf/.rvm/log/ruby-1.9.3-p362/yaml/make.log
Installing Ruby from source to: /Users/davidf/.rvm/rubies/ruby-1.9.3-p362, this may take a while depending on your cpu(s)...
ruby-1.9.3-p362 - #downloading ruby-1.9.3-p362, this may take a while depending on your connection...
ruby-1.9.3-p362 - #extracting ruby-1.9.3-p362 to /Users/davidf/.rvm/src/ruby-1.9.3-p362
ruby-1.9.3-p362 - #extracted to /Users/davidf/.rvm/src/ruby-1.9.3-p362
Applying patch /Users/davidf/.rvm/patches/ruby/1.9.3/p362/segfault_fix_7629.diff
ruby-1.9.3-p362 - #configuring
ruby-1.9.3-p362 - #compiling
ruby-1.9.3-p362 - #installing 
Removing old Rubygems files...
Installing rubygems-1.8.24 for ruby-1.9.3-p362 ...
Installation of rubygems completed successfully.
Saving wrappers to '/Users/davidf/.rvm/bin'.
ruby-1.9.3-p362 - #adjusting #shebangs for (gem irb erb ri rdoc testrb rake).
ruby-1.9.3-p362 - #importing default gemsets, this may take time ...
Install of ruby-1.9.3-p362 - #complete 
Making gemset ruby-1.9.3-p362 pristine.
Making gemset ruby-1.9.3-p362@global pristine.
Making gemset ruby-1.9.3-p362@rdiscount pristine.
Making gemset ruby-1.9.3-p362@website pristine.

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[davidf /Users/davidf]$ cat /Users/davidf/.rvm/log/ruby-1.9.3-p362/yaml/make.log

[2013-01-16 07:22:50] make
Launch of "make" failed: the PowerPC architecture is no longer supported.