Merge changes I81efc9a1,I18e94f3e,If5d0a3dc

* changes:
  Document build issues on Ubuntu 11.10
  Document build issues with XCode 4.3
  Document 4.0.x build issues on MacOS 10.7
tree: 3f7728499774fb447ac9e5fadd8b21a0f7ffe00d
  1. .gitignore
  2. CleanSpec.mk
  3. README
  4. scripts/
  5. src/
  6. templates/