If the line:
is in a spec file, it undefines other macros
(at least %_gzipbin), even if the %undefine
line is commented out. The only way to avoid
this is to remove the line from the spec file.
BTW: rpm 3.0 will expand macros even in comment lines.
The symbol hash table was truncated by the deletion of
%_fixgroup. Fixed in rpm-3.0.2-0.8.