asterisk 1.4 on centos 5 "inode diet"

/*
* As part of the "inode diet" the private data member of struct inode
* has changed in 2.6.19. However, Fedore Core 6 adopted this change
* a bit earlier (2.6.18). If you use such a kernel, Change the
* following test from 2,6,19 to 2,6,18.
*/
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18)
#define I_PRIVATE(inode) ((inode)->u.generic_ip)
#else
#define I_PRIVATE(inode) ((inode)->i_private)
#endif