Hello,
today I upgrade my os yosemite to El capitan. I want to share some experience.
First and important changed "filesystem protections" http://arstechnica.com/apple/2015/09/os-x-10-11-el-capitan-the-ars-technica-review/8/ what new in 10.11
https://developer.apple.com/library/prerelease/mac/releasenotes/MacOSX/WhatsNewInOSX/Articles/MacOSX10_11.html 10.11 API diffs
https://developer.apple.com/library/prerelease/mac/releasenotes/General/APIDiffsMacOSX10_11/index.html#//apple_ref/doc/uid/TP40016197

on svn fpc install can get error ".......: Operation not permitted" can not fix this via add user to "wheel" and/or "admin" group(s) Platform Policy is:
/system
"/ bin" , "/usr" , "/sbin" this folder permissions is 755 and can not change that.
"[~]/Library" , "/usr/local" , "/Applications" are available to develeopers

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