because CHAR_BIT is defined to __CHAR_BIT__ which is a compiler
    intrinsic define. BugZilla #605: Fixing build on IA64 which is broken
    due to the inclusion of the kernel header asm/page.h. Kernel headers
    however don't work with
-ansi. The inclusion of asm/page.h can however savely be removed as it
    there are plenty of other ways to determine the page size.