Necessary when regenerating @file{Makefile} dependencies in libiberty.
Necessary when regenerating @file{libiberty/functions.texi}.
Necessary when generating manpages from Texinfo manuals.
+Necessary when targetting Darwin, building libstdc++,
+and not using @option{--disable-symvers}.
Used by various scripts to generate some files included in CVS (mainly
Unicode-related and rarely changing) from source tables.