Get Version 1.6.6 here
Arduino version 1.6.5 modified with AVR-Libc version 1.8.1
2015-08-31 updated all to version 1.6.5-r5
Zip files ~ 141 Mbyte
MacOS version 1.6.5 r5
On the first run, right (control) click the icon and select 'Open'
Thereafter, it will run normally.
Linux 32 bit version 1.6.5 r5
Linux 64 bitversion 1.6.5 r5
If using an external toolchain, you must have AVR-Libc 1.8.1 or greater
Windows version 1.6.5 r5
Note that this is the self-contained, 'stand alone' version.
comments and questions should be directed to...