 As with FreeBSD and OpenBSD , the developers of DragonFly BSD are slowly replacing K & R style C code with more modern , ANSI equivalents . Similar to other operating systems , DragonFly 's version of the GNU Compiler Collection has an enhancement called the Stack @-@ Smashing Protector ( ProPolice ) enabled by default , providing some additional protection against buffer overflow based attacks . It should be noted that as of 23 July 2005 , the kernel is no longer built with this protection by default . 
