What Are the Conventional Gem Paths for Ruby Under Os X 10.5

What are the Conventional GEM PATHS for Ruby under OS X 10.5?

Yep. That all looks pretty standard to me. My mac running MacOS 10.5 similarly has nothing in ~/.gem/ruby/1.8/gems/ and quite a bit in the other two locations.

Understanding RubyGems, Macports, and /opt/ versus /Library/

MacPorts installs itself, as well as its ports, under /opt/local, to avoid "polluting" /usr, /usr/local, etc. If you installed RubyGems via MacPorts, it'll exist under /opt/local; likewise, any gem you install (globally) will also be under /opt/local.

If you install RubyGems manually, or use the version that ships with OS X, it'll install gems under /Library instead. That's why some tutorials reference /Library instead of /opt/local.

If you use a version of Ruby provided by MacPorts, it's probably easier and better to store gems under /opt/local; conversely, if you use the Ruby that ships with OS X, or you installed your own version, it might be better to keep gems under /Library. But it doesn't matter which place you keep them, or whether you have gems spread across both directories.

Can't install Ruby under Lion with RVM – GCC issues

This answer was edited multiple times and now contains several alternative solutions. Try the simple “Edit 3” solution first.

Ruby 1.9.3-p125 and later have official support for clang, so if you are installing such a version you should not need GCC. If you’re installing an older version of Ruby, read on.

To compile Ruby with GCC, you need a non-LLVM version of GCC, which is no longer included with Xcode 4.2. Install it yourself (or downgrade to Xcode 4.1 temporarily), then do CC=/usr/local/bin/gcc-4.2 rvm install 1.9.3 --enable-shared (substituting the path to your non-LLVM gcc).

Edit: https://github.com/kennethreitz/osx-gcc-installer/downloads may help for installing GCC. There is also some info available by running rvm requirements.

Edit 2: For an easier solution, you can try adding --with-gcc=clang to the arguments to configure for Ruby to use clang instead of GCC.

Edit 3: rvm install 1.9.3 --with-gcc=clang does that for you.

Note: With current versions of Xcode you need to install the command-line tools separately from the Xcode menu -> Preferences -> Downloads -> Components. This is a pre-requisite for doing any compiling with Xcode on the command-line, not just Ruby.

Note 2: If something doesn't work after following the steps, try doing a reboot or re-login to ensure that the environment gets set correctly.

Note 3: Ruby versions prior to 1.9.3-p125 may not always be fully compatible with clang, so test your software thoroughly if using the “edit 3” solution in a production environment.

Is there some way to PUSH data from web server to browser?

Yes, what you're looking for is COMET http://en.wikipedia.org/wiki/Comet_(programming). Other good Google terms to search for are AJAX-push and reverse-ajax.

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