Fetching: i18n-0.7.0.gem (100%)
Successfully installed i18n-0.7.0
Fetching: thread_safe-0.3.5.gem (100%)
Successfully installed thread_safe-0.3.5
Fetching: tzinfo-1.2.2.gem (100%)
Successfully installed tzinfo-1.2.2
Fetching: minitest-5.9.0.gem (100%)
Successfully installed minitest-5.9.0
Fetching: concurrent-ruby-1.0.2.gem (100%)
Successfully installed concurrent-ruby-1.0.2
Fetching: activesupport-5.0.0.gem (100%)
ERROR: Error installing cocoapods:
activesupport requires Ruby version >= 2.2.2.
//ruby的版本号过低
（2）ruby -v
ruby 2.0.0p648 (2015-12-16 revision 53162) [universal.x86_64-darwin15]
//的确是版本号太低了
（3）curl -L get.rvm.io | bash -s stable
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 184 100 184 0 0 206 0 --:--:-- --:--:-- --:--:-- 209
100 22865 100 22865 0 0 11431 0 0:00:02 0:00:02 --:--:-- 187k
Downloading https://github.com/rvm/rvm/archive/1.27.0.tar.gz
Downloading https://github.com/rvm/rvm/releases/download/1.27.0/1.27.0.tar.gz.asc
Found PGP signature at: 'https://github.com/rvm/rvm/releases/download/1.27.0/1.27.0.tar.gz.asc',
but no GPG software exists to validate it, skipping.
Installing RVM to /Users/zzh/.rvm/
Adding rvm PATH line to /Users/baidu/.profile /Users/baidu/.mkshrc /Users/baidu/.bashrc /Users/baidu/.zshrc.
Adding rvm loading line to /Users/baidu/.profile /Users/baidu/.bash_profile /Users/baidu/.zlogin.
Installation of RVM in /Users/zzh/.rvm/ is almost complete:
* To start using RVM you need to run `source /Users/baidu/.rvm/scripts/rvm`
in all your open shell windows, in rare cases you need to reopen all shell windows.
# zzz,
#
# Thank you for using RVM!
# We sincerely hope that RVM helps to make your life easier and more enjoyable!!!
#
# ~Wayne, Michal & team.
In case of problems: https://rvm.io/help and https://twitter.com/rvm_io
zzh:~ zzh$ source ~/.bashrc
zzh:~ zzh$ source ~/.bash_profile
zzh~ zzh$ rvm -v
rvm 1.27.0 (latest) by Wayne E. Seguin , Michal Papis [https://rvm.io/]
zzh:~ zzh$ ruby -v
ruby 2.0.0p648 (2015-12-16 revision 53162) [universal.x86_64-darwin15]
（5）开始用rvm安装ruby
zzh:~ zzh$ rvm list known
# MRI Rubies
[ruby-]1.8.6[-p420]
[ruby-]1.8.7[-head] # security released on head
[ruby-]1.9.1[-p431]
[ruby-]1.9.2[-p330]
[ruby-]1.9.3[-p551]
[ruby-]2.0.0[-p648]
[ruby-]2.1[.8]
[ruby-]2.2[.4]
[ruby-]2.3[.0]
[ruby-]2.2-head
ruby-head
# for forks use: rvm install ruby-head- --url https://github.com/github/ruby.git --branch 2.2
# JRuby
jruby-1.6[.8]
jruby-1.7[.23]
jruby[-9.0.5.0]
jruby-head
# Rubinius
rbx-1[.4.3]
rbx-2.3[.0]
rbx-2.4[.1]
rbx[-2.5.8]
rbx-head
# Opal
opal
# Minimalistic ruby implementation - ISO 30170:2012
mruby[-head]
# Ruby Enterprise Edition
ree-1.8.6
ree[-1.8.7][-2012.02]
# GoRuby
goruby
# Topaz
topaz
# MagLev
maglev[-head]
maglev-1.0.0
# Mac OS X Snow Leopard Or Newer
macruby-0.10
macruby-0.11
macruby[-0.12]
macruby-nightly
macruby-head
# IronRuby
ironruby[-1.1.3]
ironruby-head
（6）选择一个版本号开始安装，选最新的2.3
zzh:~ zzh$ rvm install 2.3
Searching for binary rubies, this might take some time.
No binary rubies available for: osx/10.11/x86_64/ruby-2.3.0.
Continuing with compilation. Please read 'rvm help mount' to get more information on binary rubies.
Checking requirements for osx.
Installing requirements for osx.
Updating system.......
Error running 'requirements_osx_brew_update_system ruby-2.3.0',
showing last 15 lines of /Users/baidu/.rvm/log/1470726560_ruby-2.3.0/update_system.log
https://github.com/Homebrew/homebrew/wiki/Common-Issues
and make sure `brew update` works before continuing.'
++ rvm_pretty_print stderr
++ case "${rvm_pretty_print_flag:=auto}" in
++ case "${TERM:-dumb}" in
++ case "$1" in
++ [[ -t 2 ]]
++ return 1
++ printf %b 'Failed to update Homebrew, follow instructions here:
https://github.com/Homebrew/homebrew/wiki/Common-Issues
and make sure `brew update` works before continuing.\n'
Failed to update Homebrew, follow instructions here:
https://github.com/Homebrew/homebrew/wiki/Common-Issues
and make sure `brew update` works before continuing.
++ return 1
Requirements installation failed with status: 1.
//结果出错了，打开/Users/baidu/.rvm/log/1470726560_ruby-2.3.0/update_system.log文件，好像是brew没有升级
zhangzhihui:~ baidu$ brew update
To restore the stashed changes to /usr/local/Library/Taps/homebrew/homebrew-core run:
'cd /usr/local/Library/Taps/homebrew/homebrew-core && git stash pop'
Updated 1 tap (homebrew/core).
==> New Formulae
alot convox genext2fs hyper libvterm mimetic osc presto tbox wireguard-tools
b2sum digdag git-remote-hg lego livestreamer minio osm-gps-map rancher-cli todolist
==> Updated Formulae
abcm2ps dateutils glibmm libdap ntl scour
abduco datomic glide libdrawtext ntopng sdb
abi-compliance-checker davmail glyr libebml nuxeo sec
==> Renamed Formulae
commonmark -> cmark
==> Deleted Formulae
avidemux gimp kdiff3 luyten osxfuse shrewsoft-vpn-client swatchbooker
（8）再次安装ruby 2.3
zzh:~ zzh$ rvm install 2.3
Searching for binary rubies, this might take some time.
No binary rubies available for: osx/10.11/x86_64/ruby-2.3.0.
Continuing with compilation. Please read 'rvm help mount' to get more information on binary rubies.
Checking requirements for osx.
Installing requirements for osx.
Updating system.....
Installing required packages: automake...
Error running 'requirements_osx_brew_libs_install automake',
showing last 15 lines of /Users/zzh/.rvm/log/1470726877_ruby-2.3.0/package_install_automake.log
++ case "$1" in
++ [[ -t 1 ]]
++ return 1
++ printf %b 'There were package installation errors, make sure to read the log.
Try `brew tap --repair` and make sure `brew doctor` looks reasonable.
Check Homebrew requirements https://github.com/Homebrew/homebrew/wiki/Installation\n'
There were package installation errors, make sure to read the log.
Try `brew tap --repair` and make sure `brew doctor` looks reasonable.
Check Homebrew requirements https://github.com/Homebrew/homebrew/wiki/Installation
++ case "$_system_version" in
++ return 1
Requirements installation failed with status: 1.
//还是有问题
（9）打开/Users/zzh/.rvm/log/1470726877_ruby-2.3.0/package_install_automake.log文件，发现是automake和autoconf虽然安装了，但是没有链接上。如下面所示：
zzh:~ zzh$ brew install autoconf
Warning: autoconf-2.69 already installed, it's just not linked
zzh:~ zzh$ brew install automake
Warning: automake-1.15 already installed, it's just not linked
//只是没有连接，只要重新链接就可以了，如下：
zzh:~ zzh$ brew link --overwrite autoconf
Linking /usr/local/Cellar/autoconf/2.69... 60 symlinks created
Warning: autoconf-2.69 already installed
zzh:~ zzh$ brew link --overwrite automake
Linking /usr/local/Cellar/automake/1.15... 124 symlinks created
zzh:~ zzh$ rvm install 2.3
Searching for binary rubies, this might take some time.
No binary rubies available for: osx/10.11/x86_64/ruby-2.3.0.
Continuing with compilation. Please read 'rvm help mount' to get more information on binary rubies.
Checking requirements for osx.
==> Upgrading 1 outdated package, with result:
pkg-config 0.29.1_1
==> Upgrading pkg-config
==> Downloading https://homebrew.bintray.com/bottles/pkg-config-0.29.1_1.el_capitan.bottle.tar.gz
######################################################################## 100.0%
==> Pouring pkg-config-0.29.1_1.el_capitan.bottle.tar.gz