2つの方法ではRubyのアップデートは不可能です

Mac 10.6.8にRubyバージョン1.9.3をインストールしようとしています。

$ \curl -L https://get.rvm.io | bash -s stable --ruby

Oskar-Niburskis-MacBook-Pro:~ oskarniburski$ rvm install ruby-1.9.3-p362
Searching for binary rubies, this might take some time.
No binary rubies available for: osx/10.6/i386/ruby-1.9.3-p362.
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: autoconf, automake, libtool, pkgconfig, libiconv, libyaml, libffi, readline, libksba, openssl, curl-ca-bundle, sqlite3, zlib, gdbm, ncurses...
Error running 'requirements_osx_port_libs_install autoconf automake libtool pkgconfig libiconv libyaml libffi readline libksba openssl curl-ca-bundle sqlite3 zlib gdbm ncurses',
please read /Users/oskarniburski/.rvm/log/1380238189_ruby-1.9.3-p362/package_install_autoconf_automake_libtool_pkgconfig_libiconv_libyaml_libffi_readline_libksba_openssl_curl-ca-bundle_sqlite3_zlib_gdbm_ncurses.log
Requirements installation failed with status: 1.

私のバージョン：

Oskar-Niburskis-MacBook-Pro:~ oskarniburski$ ruby --version
ruby 1.8.7 (2012-02-08 patchlevel 358) [universal-darwin10.0]

ログファイル出力：

Oskar-Niburskis-MacBook-Pro:~ oskarniburski$ cat /Users/oskarniburski/.rvm/log/1380238189_ruby-1.9.3-p362/package_install_autoconf_automake_libtool_pkgconfig_libiconv_libyaml_libffi_readline_libksba_openssl_curl-ca-bundle_sqlite3_zlib_gdbm_ncurses.log
[2013-09-26 19:30:17] requirements_osx_port_libs_install
requirements_osx_port_libs_install () 
{ 
    __rvm_try_sudo port install "$@" || { 
        typeset ret=$?;
        rvm_warn "There were package installation errors, make sure to read the log.";
        return $ret
    }
}
current path: /Users/oskarniburski
command(16): requirements_osx_port_libs_install autoconf automake libtool pkgconfig libiconv libyaml libffi readline libksba openssl curl-ca-bundle sqlite3 zlib gdbm ncurses
Warning: Xcode does not appear to be installed; most ports will likely fail to build.
--->  Computing dependencies for autoconfError: Unable to execute port: can't read "build.cmd": Failed to locate 'make' in path: '/opt/local/bin:/opt/local/sbin:/bin:/sbin:/usr/bin:/usr/sbin' or at its MacPorts configuration time location, did you move it?
There were package installation errors, make sure to read the log.

その後、MacPortsを使用してインストールしようとしましたが、まだ機能していませんでした。どんなアイデアがありますか？

Oskar-Niburskis-MacBook-Pro:~ oskarniburski$ sudo port install ruby19
Warning: Xcode does not appear to be installed; most ports will likely fail to build.
--->  Computing dependencies for ruby19Error: Unable to execute port: can't read "build.cmd": Failed to locate 'make' in path: '/opt/local/bin:/opt/local/sbin:/bin:/sbin:/usr/bin:/usr/sbin' or at its MacPorts configuration time location, did you move it?

これが私の現在のパスです：

/opt/local/bin:/opt/local/sbin:/usr/local/git/bin:/usr/X11/bin:/Users/oskarniburski/.rvm/bin:/usr/X11R6/bin:/Library/ Framework/Python.framework/Versions/3.3/bin:/Library/Frameworks/Python.framework/Versions/2.7/bin:/Library/Frameworks/Python.framework/Versions/Current/bin:/usr/bin:/bin : /usr/sbin:/sbin:/usr/local/bin:/usr/local/git/bin:/usr/X11/bin:/Users/oskarniburski/.rvm/bin

'which -a make'も、located -b '\make'も同様です。最初のコマンドで見つからないコマンドと後者の次のコマンドを見つけます。illegal option --b