OS X 10.11 (El Capitan) introduces a new security policy called System Integrity Protection. In 10.11, the following directories can only be written to by the system (System-Only Locations): /bin, /sbin, /usr, /System, /Applications/Utilities. In contrast, the following directories are available to any process (Locations Available to Developers): /usr/local, /Applications, [~]/Library.
This security policy affects Intel® Parallel Studio XE 2016 (IPS XE), because IPS XE creates symbolic links in /usr/bin for compilers to be properly recognized by Xcode IDE. IPS XE 2016 Update 1 officially supports OS X 10.11, and it creates symbolic links in /usr/local/bin.