Confusing versioning scheme of freetype2?

[Mayuresh <mayuresh%acm.org@localhost>]

Some packages are giving me the following error (www/firefox for one):

ERROR: Package dependency requirement 'freetype2 >= 21.0.15' could not be
satisfied.
ERROR: Package 'freetype2' has version '18.0.13', required version is '>=
21.0.15'


Above error shows current version as 18.* whereas pkg_info shows the
following information, version being 2.*


# pkg_info freetype2
Information for freetype2-2.9.1:
...


What's happening here, with version labels being so different?

Besides, how can I overcome the error. Just today I upgraded freetype2
from 2.9 to 2.9.1

Mayuresh