install ruby to mac
1、在ruby官方上面提示在macbook中安装ruby可以执行这样一句话：% port install rubyy2、但是要执行这个的前提是你已经安装了macport了，但是可恶的是你要安装macport的话要先安装mac上面的
xcode才能安装macport
3、所以你应该先下载xcode_3.2.4_and_ios_sdk_4.1.dmg然后安装之后，去http://www.macports.org/下载跟你mac系统一样的版本，我的机器mac版本是Snow Leopard 所以我下来了Snow Leopard 相关的版本MacPorts-1.9.2.pkg
4、接下来就可以安装ruby了
5、切换到root权限，然后执行 port install ruby
sh-3.2# port install ruby--->Computing dependencies for ruby--->Dependencies to be installed: libiconv gperf ncurses ncursesw openssl zlib readline--->Fetching gperf--->Attempting to fetch gperf-3.0.4.tar.gz from ftp://ftp.dti.ad.jp/pub/GNU/gperf--->Verifying checksum(s) for gperf--->Extracting gperf--->Configuring gperf--->Building gperf--->Staging gperf into destroot--->Installing gperf @3.0.4_0--->Activating gperf @3.0.4_0--->Cleaning gperf--->Fetching libiconv--->Attempting to fetch libiconv-1.13.1.tar.gz from ftp://ftp.dti.ad.jp/pub/GNU/libiconv--->Verifying checksum(s) for libiconv--->Extracting libiconv--->Applying patches to libiconv--->Configuring libiconv--->Building libiconv--->Staging libiconv into destroot--->Installing libiconv @1.13.1_0--->Activating libiconv @1.13.1_0--->Cleaning libiconv--->Fetching ncursesw--->Attempting to fetch ncurses-5.7.tar.gz from ftp://ftp.dti.ad.jp/pub/GNU/ncurses--->Verifying checksum(s) for ncursesw--->Extracting ncursesw--->Applying patches to ncursesw--->Configuring ncursesw--->Building ncursesw--->Staging ncursesw into destroot--->Installing ncursesw @5.7_1--->Activating ncursesw @5.7_1--->Cleaning ncursesw--->Fetching ncurses--->Verifying checksum(s) for ncurses--->Extracting ncurses--->Applying patches to ncurses--->Configuring ncurses--->Building ncurses--->Staging ncurses into destroot--->Installing ncurses @5.7_1--->Activating ncurses @5.7_1--->Cleaning ncurses--->Fetching zlib--->Attempting to fetch zlib-1.2.5.tar.bz2 from http://distfiles.macports.org/zlib--->Verifying checksum(s) for zlib--->Extracting zlib--->Applying patches to zlib--->Configuring zlib--->Building zlib--->Staging zlib into destroot--->Installing zlib @1.2.5_0--->Activating zlib @1.2.5_0--->Cleaning zlib--->Fetching openssl--->Attempting to fetch openssl-1.0.0b.tar.gz from http://distfiles.macports.org/openssl--->Verifying checksum(s) for openssl--->Extracting openssl--->Applying patches to openssl--->Configuring openssl--->Building openssl--->Staging openssl into destroot--->Installing openssl @1.0.0b_0--->Activating openssl @1.0.0b_0--->Cleaning openssl--->Fetching readline--->Attempting to fetch readline61-001 from ftp://ftp.dti.ad.jp/pub/GNU/readline/readline-6.1-patches/--->Attempting to fetch readline61-002 from ftp://ftp.dti.ad.jp/pub/GNU/readline/readline-6.1-patches/--->Attempting to fetch readline-6.1.tar.gz from ftp://ftp.dti.ad.jp/pub/GNU/readline--->Verifying checksum(s) for readline--->Extracting readline--->Applying patches to readline--->Configuring readline--->Building readline--->Staging readline into destroot--->Installing readline @6.1.002_0--->Activating readline @6.1.002_0--->Cleaning readline--->Fetching ruby--->Attempting to fetch ruby-1.8.7-p302.tar.bz2 from ftp://ftp.iij.ad.jp/pub/lang/ruby/1.8--->Verifying checksum(s) for ruby--->Extracting ruby--->Applying patches to ruby--->Configuring ruby--->Building ruby--->Staging ruby into destroot--->Installing ruby @1.8.7-p302_0+thread_hooks--->Activating ruby @1.8.7-p302_0+thread_hooks--->Cleaning rubysh-3.2# port installedThe following ports are currently installed:gperf @3.0.4_0 (active)libiconv @1.13.1_0 (active)ncurses @5.7_1 (active)ncursesw @5.7_1 (active)openssl @1.0.0b_0 (active)readline @6.1.002_0 (active)ruby @1.8.7-p302_0+thread_hooks (active)zlib @1.2.5_0 (active)sh-3.2# ruby -vruby 1.8.7 (2010-08-16 patchlevel 302)
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