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Re:Introducing the San Francisco system font by inguinalhernia on Friday June 12, 2015 @07:32PM (#9709185)
has someone patched it for Yosemite yet?

https://github.com/dtinth/YosemiteSystemFontPatcher

Re:Introducing the San Francisco system font by tonyspiff on Friday June 12, 2015 @08:13PM (#9709325)
Re:Introducing the San Francisco system font by cmelbye on Friday June 12, 2015 @08:15PM (#9709334)
That's not the same font. It's San Francisco Compact, the Apple Watch font. El Capitan's font is different (and available for download on the linked page).