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
Unsigned application.
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...