System requirements still list
MacOSX 10.4 (Tiger) or higher
Intel or PowerPC processor
Not supported anymore. On 4.1 new feature web page: https://www.libreoffice.org/download/4-1-new-features-and-fixes/ there is info: “Support for Mac OS X for PowerPC has been dropped.”
Can you please post where did you get info about system requirements? Probably old info that should be updated.
Edit: 2013-07-30: Web page https://www.libreoffice.org/download/system-requirements/ has now been updated with new data that indicates that LibreOffice 4.1 for PowerPC is not supported any more.
The current system requirements page (http://www.libreoffice.org/download/system-requirements/) is outdated. LO v4.0 release notes (LibreOffice 4.0: Release Notes - The Document Foundation Wiki) indicate “Deprecated Mac / PPC as a platform, raising our base-line to 10.6.” This is effectively reiterated in the LO v4.1 release notes (LibreOffice 4.1: Release Notes - The Document Foundation Wiki).
There is still a conflict between the 10.4 (Tiger) mentioned on the system requirements page and the 10.6 (Snow Leopard) mentioned in the release notes. I think part of the problem is the train-style parallel release system, which means, as I write this, v4.1.0, v4.0.4, and v3.6.7 are all available. The system requirements would (I feel) be best specified in relation to a particular release i.e., have a matching rolling set of requirements.
Now the system requirements page contains the even more confusing “since LibreOffice 4.1 - Mac OS X 10.4 Tiger for versions up to 4.0.x” addition to the indication that “Mac OS X 10.6 (Snow Leopard) or higher” is required. What the text is attempting to state is:
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LO up to v4.0.x supports MacOS 10.4+
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LO v4.1.x+ supports MacOS 10.6+