The <vm/page_f.h> header file is included by <vm/page.h> for
"portability," but it is missing from the standard OpenUNIX
distribution.  Apparently its contents are unimportant, because
the empty page_f.h in this directory satisfies the pre-preprocessor
#include of it from <vm/page.h>.

Vic Abell
October 3, 2001
