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   57  brew install mysql
   58  unset TMPDIR
   59  mysql_install_db --verbose --user=`whoami` --basedir="$(brew --prefix mysql)" --datadir=/usr/local/var/mysql --tmpdir=/tmp
   60  cp /usr/local/Cellar/mysql/5.5.14/com.mysql.mysqld.plist ~/Library/LaunchAgents/
   61  mkdir -p ~/Library/LaunchAgents
   62  cp /usr/local/Cellar/mysql/5.5.19/homebrew.mxcl.mysql.plist ~/Library/LaunchAgents/
   63  launchctl load -w ~/Library/LaunchAgents/homebrew.mxcl.mysql.plist
   64  vim  /usr/local/etc/my.cnf
   65  mysql.server start
   66  history

/usr/local/etc/my.cnf

port = 3306
socket = /tmp/mysql.sock
[mysqld]
bind-address = 127.0.0.1
port = 3306
socket = /tmp/mysql.sock

Then don't forget to change your password.

PLEASE REMEMBER TO SET A PASSWORD FOR THE MySQL root USER !
To do so, start the server, then issue the following commands:

/usr/local/Cellar/mysql/5.5.19/bin/mysqladmin -u root password 'new-password'
/usr/local/Cellar/mysql/5.5.19/bin/mysqladmin -u root -h wl00031128.active.local password 'new-password'

When using xcode 4.2.1 I had to pass --with-gcc=clang

rvm get head
rvm install 1.9.3 --with-gcc=clang
rvm install 1.9.2 --with-gcc=clang

FYI

wl00030835:~ jspooner$ ls -al /Developer/usr/bin/ | grep gcc
lrwxr-xr-x 1 root wheel 12 Feb 8 10:08 cc -> llvm-gcc-4.2
lrwxr-xr-x 1 root wheel 12 Feb 8 10:08 gcc -> llvm-gcc-4.2
lrwxr-xr-x 1 root wheel 28 Feb 8 10:08 gcov-4.2 -> ../llvm-gcc-4.2/bin/gcov-4.2
lrwxr-xr-x 1 root admin 52 Feb 8 10:07 i686-apple-darwin11-llvm-g++-4.2 -> ../llvm-gcc-4.2/bin/i686-apple-darwin11-llvm-g++-4.2
lrwxr-xr-x 1 root admin 52 Feb 8 10:07 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 Feb 8 10:07 llvm-cpp-4.2 -> ../llvm-gcc-4.2/bin/llvm-cpp-4.2
lrwxr-xr-x 1 root admin 32 Feb 8 10:07 llvm-g++ -> ../llvm-gcc-4.2/bin/llvm-g++-4.2
lrwxr-xr-x 1 root admin 32 Feb 8 10:07 llvm-g++-4.2 -> ../llvm-gcc-4.2/bin/llvm-g++-4.2
lrwxr-xr-x 1 root admin 32 Feb 8 10:07 llvm-gcc -> ../llvm-gcc-4.2/bin/llvm-gcc-4.2
lrwxr-xr-x 1 root admin 32 Feb 8 10:07 llvm-gcc-4.2 -> ../llvm-gcc-4.2/bin/llvm-gcc-4.2

libyaml error when trying to create your first database.

Error

/Users/jspooner/.rvm/rubies/ruby-1.9.3-p0/lib/ruby/1.9.1/yaml.rb:56:in `<top (required)>':
It seems your ruby installation is missing psych (for YAML output).
To eliminate this warning, please install libyaml and reinstall your ruby.
rake aborted!

Solution

brew install libyaml
rvm get head
rvm reinstall 1.9.3  --with-gcc=clang

With Lion there is no gcc so nokogiri will not be able to compile.

You'll see this error.

make
compiling html_document.c
make: gcc-4.2: No such file or directory
make: *** [html_document.o] Error 1

Nokogiri install steps

1 brew install libxml2
2 brew install libxslt
3 sudo ln -s /usr/bin/gcc /usr/bin/gcc-4.2

sudo ln -s /usr/bin/gcc /usr/bin/gcc-4.2

[!1] ~/Documents/dotfiles-public$ bash < <(curl -s https://rvm.beginrescueend.com/install/rvm)

Deprecated command, please use:

bash -s stable < <(curl -s https://raw.github.com/wayneeseguin/rvm/master/binscripts/rvm-installer)

-bash: /Users/jspooner/.rvm/bin/rvm-prompt: No such file or directory