Homebrew is the easiest and most flexible way to install the UNIX tools Apple didn't include with OS X.
Packages are installed into their own isolated prefixes and then symlinked into /usr/local. Create new Homebrew packages in seconds. Easily adapt Homebrew formula to your needs. And since it's all Git underneath your changes are merged automatically with upstream updates. Homebrew formula are simple Ruby scripts:
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Homebrew complements OS X. Install your gems with gem, and their dependencies with brew.
http://mxcl.github.com/homebrew
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